'41 -48 Ford, '68-72 Chevelle There is no point in mocking up the wheels to a width that in not commercially available or one that was never provided by the OEMs unless you are planning on spending a lot more money on a custom width housing and axles. . Outside Width: Year: Model: 56.50: 1969-1977: Maverick 8" 56.50: 1990-1992: Ford Ranger 8.8" 56.75: 1995-2003: Ford Explorer 8.8" Narrowed w/2 short side axles: 57.00: 1974-1978: Mustang II 8" 57.25: 1957-1959: Ford, Ranchero . Yes the axles were special in that I wanted to use a 28 spline center section already had rather than buy a new 3rd member to suit the 31 spline axles that Speedway stocked. Willwood Engineering. 6>"FlJz^l,*4&V0afw .a@z"PXdj}o`2/ OQs=`&qf aDK|/U32.)0i%q~P"BaLw.Y@`uwy#Do~vt*o~@$y-KZe]X3q'WWb2y)0`61"4@Q*`6k RPf\`H#@ ^M8-|&YxO-t I've read enough times that '64/'65 are 54.25" and '66's are an inch wider that I believe it. Once the wheels and axle was centered under the car I was able to raise and lower the wheels with my floor jack to check for clearance at different ride height and suspension travel. Discussion in 'Traditional Hot Rods' started by Ruiner, Sep 4, 2006. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. '72 Cricket '68 AMX lx ?ZXj^|\\(|ka(XKIg#+ These dimensions do not include brake drums and are measured from backing plate to backing plate. In the '50s and '60s the search for high-performance parts usually meant a trip to the wrecking yard to rob components, engines, out of big, powerful cars of the dayChryslers, Fords, Cadillacs, Olds, Pontiacs, and W-Chevys were all used. Because the Borg-Warner axles were no longer being used for the G92 option, optional axle ratios changed slightly: LB9 305 TPI 5 speed went from 3.45 (1989) to 3.42 (1990) and the B2L 350 TPI went from 3.27 (1989) to 3.23 (1990). http://www.jalopyjournal.com/forum/showthread.php?t=128884, http://www.jalopyjournal.com/forum/showthread.php?t=38805, Upstate New York, watching my New Yorker Rust, http://www.jalopyjournal.com/forum/showthread.php?t=128884&page=2, http://www.jalopyjournal.com/forum/showthread.php?p=1450810#post1450810, (You must log in or sign up to reply here. I'm not sure of the Task Force width ranges at this time. NFTs Simplified > Uncategorized > pontiac rear end width chart. The power is transmitted to the road by the rear . Vehicles with Similar . But it's been so long I can't be certain. I placed the order with Speedway motors in late July for my rear end housing and Currie axles. . However, the 9.3-inch differential was saved from obsolescence by a Texas-based company called Fabcraft Metalworks and its owner, Brad Duerst. We'll work to keep you motivated and informed and with industry news, product information and reviews, event coverage, and well-curated articles and stories intended to inspire and educate. '67 Lincoln, '69 Dodge They were tough with 9.3-inch ring gears, big pinion shafts, and large-diameter bearings and tough axles. (Dart/Duster) with V8&3/4 axle, Table taken from "How to Build wagon pontiac plant 1975 2.73 ua va b sedan 1975 2.73 ya za b wagon 1975 2.73 pa pu f 1975 2.73 wl xl g . While the Ford 9-inch is the perceived benchmark of popular rearends today, in stock form the edge would go to the Pontiac/Olds. '67 Chevrolet big car But when it came to rearends, the overwhelming favorites were those our of '57-64 Pontiacs and Oldsmobiles. The later rear axle requires a wheel with between 5" and 5-1/4" of backspacing, while the earlier axles will only need a wheel with 4-1/2" to 4-3/4" backspacing. 0000002004 00000 n Maverick 5 Lug 8", 49-51 Ford, 57-59 Ford 9", 58" 78-88 Mid getting back to the differential, why bill didn't cover 1956 i don't know, might have just been a typo or overlooked. Rey Payumo of Kailua, Hawaii found this 1963 Chevrolet Impala packed with junk in a garage in Hayward, California. '69 Nova 0000001170 00000 n Six rib cases will be found on '57 and '58 rearends, '59-64s have seven ribs. Its narrow front end with a plastic, wrapped-around bumper featured fog lights as an option. '74 Valiant, '57 Ford Chevy 10 Bolt Rear End Widths. 0000012085 00000 n Check here to see if your engine is correct for your year truck. Actual wheel track could be as much as 6" to 8"depending on drum size: '67 to '70 Mustang/Cougar 6 cyl. The following information is provided to help you identify the differential you are working on. Valves. xb```"~> !%1#XY} P A1@G7L/^nkX,i{j^vL@l ` n Look at the RPO codes. Drag Racing 101 ~ Everything You Need to Know! Rear Wheel: Production Years for Series : 1964 - 1967 : Price : $2,437-$3,095: Weight : 3015 lbs | 1367.581 kg: Performance. To say I was disappointed by the service provided by this company would be an understatement. A turbocharger was added to the 301 to give the 1980 Trans Am an injection of performance. 40/13. Below matches. I came up with a cheap simple method to confirm the results of the measurement taken with the loose wheels. What I did is shown below in the photos. The Dana rear end is a bolt in swap for the both the 8 3/8 and the 9 1/4, all rear ends can be had with the same size u joint yokes, vans are good place to. Dec 26, 2008. All Rights Reserved. HVMo0WJ~H|V`-e)6`!$)=-~6x@h1|o Find your GMC/Chevy vehicle in the chart below and click on the illustration for a larger view. 1969. 1940 engine numbers run 2697268 through 3665902. Engine Numbers. It has an M-21 four speed and I am ready to upgrade the rear diff. . The 8.5-inch 10-bolt rearends have ten 3/4-inch hex head bolts with 7/16-20-inch left-hand thread bolts that hold the ring gear to the carrier. ). Housings with leaf springs were used under Pontiac and Olds in 1957 and Olds only in 1958-60; Pontiacs had coil springs in 1958-60 and from 1961-64 both had coils. Advance Design Trucks seem to be using rear Suspension Width (Flange to Flange), Ford Mustang II/Pinto & Many aftermarket options exist with all of the appropriate mount points. The new P/O 9.3-inch immediately found its way into hot rods and race cars. //-->. The most common GM unit for the 1982 to 1992 Camaro is the Saginaw style 10 bolt Chevy differential. SKU: CE-GMG7887X. 62" 64-77 Chevelle, 73-76 Torino, 89 AXLE DIFF 4X4 FRONT DIFF PARTS AXLE DIFF REAR END PARTS . It is a little better than the Camaro 8.2 10 bolt. The current axle needs to be measured to verify width, because it plays an important part in determining what rim backspacing is necessary. 41/14. %PDF-1.4 % The now famous Ford 9-inch, with it's unique, straddle mounted pinion, offered great strength for its weight, but even the heavy-duty nodular-iron version suffered from weaknesses that the 9.3-inch did not. I used 5 long lag bolts to hold the end pieces of wood on which permitted me to add up to 1.5 of shims to each end. Several years later, the popularity of this almost deceased differential was rapidly swelling. Both of these are semi-floating axles. ; Home 2; Home 3; Home / / pontiac rear end width chart. Part Number: YGA-21289. with 10 bolt axle. 5D med-duty 4-pinion. '72 Cougar, '74 Pontiac '49 Plymouth, '61 Chevrolet Impala '65 Cadillac, '66 Buick Wildcat '66-67 Chevrolet Big Car, '72 Charger The 55-57 Chevy car rear-end is almost a bolt in, the perches need to be relocated to the top of the housing though. charles coker, 1953 pontiac tech advisor. var t=new Date(); The P/O rearend and parts were getting harder to find and there were more Ford 9-inchers being made every day. S10. Housings with leaf springs were used under Pontiac and Olds in 1957 and Olds only in 1958-60; Pontiacs had coil . Roadkill Customs has evolved from local hot rod shop to online how-to magazine for budget-minded do-it-yourself hot rod builders and enthusiasts. This method will work but the wheels are always trying to roll away and tip over making it very hard to check for clearance and be sure that your measurements are correct . Rusty but Rare 1976 Chevy K10 Sport Truck Revival! @`AWG^8J>4j|^Vk@oXq7@@/9ep By designing ring-and-pinion sets to fit the previously less-attractive, but more available, Series II OE carriers, performance ratios could now be utilized without the need for an unfavorable ring-gear spacer. '69 Javelin Six , '70 dodge Snap On vs Daytona, Pittsburgh, ESCO, Husky, More. The 8.2" BOP (Buick, Oldsmobile, Pontiac) model is slightly different in that it uses pressed on axle bearings and instead of c-clips . Prices and availability are subject For some time, only a small handful of ratios were available in new gears. That being said, if you have at least 2" of clearance (and preferably more) between your stock tire/wheel combo and the frame or exhaust pipe, whichever is closest to the tire, then a 56" rear end width could possibly fit. Newest [ January 23, 2023 ] Vintage 1980 Yamaha Enticer Snowmobile Revival to Former Glory Roadkill Powersports 455 ho only(c-type axle) 12 bolt 1970 3.36 cok col fb 1970 3.55 cow cox fb 1970 3.55 wv xv gto 455 ho only(c-type axle) 12 . The new 9.3-inch provided outstanding durability when subjected to abuse from all classes of race cars, including Top Fuel. } ends with widths ranging from 58"- 62". [ July 26, 2022 ] Reversing Gears ~ Rescuing One's Own Derelict 1967 Pontiac GTO Builds and Examples [ July 24, 2022 ] . may be different than pictured. You're building a gasser. ZE reg-duty / 4E med-duty 4-pinion. For the do-it-yourselfer, Fabcraft offers a full-color manual with excellent tech info on the differential. Under the hood, Pontiac installed a 2.5 . B-O-P axles also have identifying grooves traveling along each side of . A: Ford 9-inch is like the small-block Chevy of rearends. Dec 20, 2007. You bring the gumption. My '64's measure 54.25". The pinion shaft diameter is 1.625 inches and will have either 28 or 30 splines. This posi has 4 pinion gears, which makes it about 2 times as strong as the Chevy Eaton posi. /** * Error Protection API: WP_Paused_Extensions_Storage class * * @package * @since 5.2.0 */ /** * Core class used for storing paused extensions. There have been non C-clip rearends found in Chevelle wagons, and some El Caminos through at least 1974. The following list Rear End Widths - - Back - - Home > Specs > Rear End Widths : Representative for comparison purposes only. 1990 to 1992: 7.625 inch ring gear, 28 spline axle. For die-hard purists, it soon became a difficult proposition to build a worthy P/O 9.3-inch as aftermarket support subsided and the supply of virgin factory parts withered. Buy in monthly payments with Affirm on orders over $50. There are three different third-member castings, but all will install into any '57-'64 Pontiac/Olds housing. Source for tire and wheel application fitment data. for highway driving. compensate for drums as follows: 4" - 71- Newer 2wd trucks use a 5 on 5 lug pattern Please select a rear end that matches your vehicle below.General Motors has a wide range of front and rear ends! note 64 64 axle is same. GMC V-6 used a 3.21 Dana 44 used a standard chevy 1310 yoke, Dana 60 used the heavy duty yoke which takes the larger 1350 yoke. Casting # Year: Body: Size: Notes: 2070051: 1960 - 71: A . You can identify the B-O-P assemblies by the two reverse-scalloped sections of the differential cover located at the 9 and 3 o'clock positions. Some of the most frequently asked questions regarding the Pontiac/Oldsmobile 9.3-inch rearend: A: Fabcraft Metalworks provides virtually every component for the Pontiac/Oldsmobile 9.3-inch rearend. Why not a Ford? HVr0*u9$K;IG]&U&"x\s. We carry everything from the 7.25" IFS front end parts, to the large 11.5" rear end parts for 1-ton trucks.We make it easy to verify your exact rear end by providing specs and year, make, and model applications for . if you dont have a versailles just a regular 9 inch rear end,, that is also 60 ". 60" 60's GMC and some Chevy's Dana 44 or Dana 60 with leaf springs 6 lug, Gear ratio's 3.21 to 3.92. Ford Mustang Complete 9" Rear End Packages, GM G-body 78-87 Complete 9" Rear End Package, GM Chevy S10 82-04 Complete 9" Rear End Package, GM Tri 5 55-57 Chevy Complete 9" Rear End Package, GM X-Body Nova Complete Rear End Packages, Axle Bearings, Retainer Plates, & Wheel Studs, Bearings, Differential Parts, Seals, & Hardware, Master Cylinders, Caliper Kits, and Parts. The1971-'72 Buick GS/Skylark and Olds Cutlass A-body 8.5 10 bolt did not have C-clip axles. PY Online Forums - Bringing the Pontiac Hobby Together, Classic TECH- specs, codes, resto issues FORUMS. Product By Category; Products By SKU/ID; . We provide how-to and technical articles, vehicle and build features and examples, plus calculators and lookups that will help you get your ride from dream to driver. 0000007740 00000 n All but a few of the old factory limited-slips had been gathered up and beaten to death. GM with 7.5 & 7.625 Ring Gears : 1985-1997. Information provided by:Joe GarciaThe Resto Rod Shop. Q: Why do Pontiac/Olds 9.3 parts cost more than those for a Ford 9-inch? Mercury Capri/Bobcat, Monte Carlo, Regal, etc. The 1' wider that was stated in paul/chuck 's book may have been miss spoke. Add Width to compensate for drums as follows: 4" - 5" for small cars 5" - 6" for intermediate cars 6" - 8" for large cars . 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Pontiac/Olds rearends had been widely used full width under Gassers and other cars and even though lots of slingshot dragster pilots had their legs draped over a narrowed version, custom-width rearends were seldom seen in other applications and almost never under a street car. These smaller volumes and domestic content result in slightly higher prices. Very hard to find set, being as this is version is not being reproduced. It'll help you sniff out the right parts and will walk you through building the differential for your gasser project. Rear axle widths. With a maximum top speed of 112 mph (180 km/h), a curb weight of 2672 lbs (1212 kgs), the Fiero GT has a naturally-aspirated V 6 cylinder engine, Petrol motor. If in doubt, consult one of our differential experts at (800)510-0950! Underneath the back end of an overwhelming majority of gassers was a 1957-'64 Pontiac/Oldsmobile 9.3-inch differential. Click the above picture to view full size. In 1958 a good thing got better when limited-slip differentials were offered. Buick/Olds/Pontiac axles are typically retained with bearings. 1958-1970 Full size Chevy rear differential identification chart. The 8.75 (8 3/4) rear end LOADS FROM THE FRONT and IS THE ONLY REAR END THAT DOESN'T HAVE A REAR COVER. Plywood pieces work well for shims. Real World Hagerty Collector Car Insurance Claim Experience, How To Be Prepared For A Dyno Session And Not Waste Your Money, Holey Goat Father/Son Texas Road Trip 5 Days, and 2000+ Miles, Are You Killing The Hot Rod Community? The total width of the Chevy II rear end is 58 inches and the total width of a '67 to '69 Camaro rear end is 60 inches. Estimated Lead Time: 5-Days. . All housings have strong, tapered axle tubes, come in numerous widths, and sport a variety of suspension brackets. You can do this by multiplying by the gear ratio. "Stovebolt" Specifications. '70 Dodge, '71-77 Maverick "SPECIAL" CARS - 1938 Pontiac Special six. Correct two piece design posi unit, exact for only 67 - 69 Firebird 10 bolt 8.2 rears. The 8.75-inch had slightly larger, 30-spline axleshafts compared to the P/O's 29-spline shafts; but by 1959, big 31-spline factory shafts were standard, and aftermarket shafts for the 9.3-inch eliminated any supposed shortcomings. 1982-1997. Floor jack permits you to raise and lower wheels to check for clearance. endstream endobj 29 0 obj<>stream 70 2wd 6 lug rear end 12 bolt Possible gear ratio's 3:08, 3:40, 3:73 70-81 4wd 6 lug reared 71- Newer 2wd trucks use a 5 on 5 lug pattern 71-76 Full Size Cars " "" "" ". Hot Rod Blueprints, Drawings and Tech Tips For The Hot Rod Enthusiast!. note 64 64 axle is same. 100 x 4.12. GM / Chevy - Differential IdentificationShop by your differential. Approximate rear end widths measured from backing plate to backing plate. For many years prior, Olds and Pontiac differentials had been a dominant rear axle in drag racing and other motorsports. 3.21 to 3.92. GU6 - 3.42's Standard manual trans gear ratio. Prices and availability are subject Approximate rear end widths measured from backing plate to backing plate. I used 5" long lag bolts to hold the end pieces of wood on which permitted me to add up to 1.5" of shims to each end. . Needle BUILD IT YOURSELF - PARTS LISTS BUSHINGS TO ADAPT TUBE SIZE . The 1967 GTO came in 3 speed Automatic and a 4 Speed manual. GU5 - 3.23's Optional auto trans gear ratio. "" "" ". User Info. The following is a general candidate to replace the torque tube rear end or just get a better set of gears '67 Chevrolet Six '64 1/2-'65 Mustang Fabcraft also offered complete components for the differential, including all necessary bearings, seals, shims, limited-slip clutches, solid spacers, and crush sleeves, as well as beautifully refurbished OE parts. Automotive Technical and Reference Information, Project Cars, Trucks and Salvage Vehicles For Sale. Check our the Chevy rear end gear ratio chart above to help you identify the correct gear to use. Lincoln Versailles, Regal with 10 bolt axle, S-10 P.U., 65-67 Nova. 0000006915 00000 n The intake valve size increased to 2.11" and the exhaust valve increased to 1.77"in size from the previous model. Add Width to compensate for drums as follows: 4" - 5" for small cars 5" - 6" for intermediate cars 6" - 8" for large cars . some sources state that the 67 and latter are wider. This 1955 Chevrolet 3100 Step Side Pickup Truck was built by the Hot Rod Factory, Minnesotas premier hot rod shop and muscle car restoration facility. '72-73 Mazda, '28-40 Ford , '57 - 59 Ford i know in 1956 the pontiac dual range hydra-matic got a different driveshaft yoke. I'm running the wider blazer rear end . The T/A 6.6 was available for most of the model year, but once the supply of stockpiled 400s was exhausted, it signaled the end of the big Pontiac V-8. Posts: 8. Privacy Policy. Building a gasser is a satisfying way to blast down the track, turn some heads, and salute the good old days of racing. This reduced weight and eliminated the stock suspension, producing a spacious engine bay that eagerly accepted the chosen powerplant. Like most american muscle cars of the Day the Pontiac GTO was a front engined rear wheel driven car. Dick this in no way reflects upon your statement but you make an excelent point when you stated " I read enough times that". In head/2 per cylinder. of torque to the pinion gear and the gear ratio of the ring-and-pinion is say 4.12:1, the output torque is 412 ft./lbs. of extensive information was contributed by R. Welch: Original Vehicles This assembly used an 8.2-inch ring gear diameter and 28-spline axles for Camaros, Chevelles, Impalas and even the early Chevy II's. 4.24 out of 5 stars. Your differential is the set of gears that allows your vehicles driven wheels to revolve at different speeds by splitting your engine torque in two directions, An Online Magazine for DIY Hot Rod Builders. also note on the A4's (auto's) shifter console if the gear selector for 1 is missing. GU2 - 2.73's Standard auto trans gear ratio. The 1967 Firebird has the particularity to have a rear axle held by arms while in 1968 rear axle was hold only by the blades/spring of suspensions. Chrome 10 Bolt Rear End Cover Fits Chevy Pontiac Oldsmobile10 Bolt Differential A: By casting numbers and date codes, along with other external characteristics, all of which are shown in the manual by Zach Davidson and Brad Duerst. '69 Dodge Van, '71 Torino Quick question, I'm looking at a '50 Pontiac and was wondering if it had a torque-tube or a driveshaft. Compared to the Ford, the P/O parts were more expensive. The high-volume production runs of Ford-9 inch components allow them to be relatively inexpensive. 62" 64-77 Chevelle, 73-76 Torino, 89 Trans Am. BOP, Pontiac, Each. Trans Am. find the 1/2 ton size yoke on a dana 60. Items A little history: In 1957, three important axles were introduced: Ford's 9-inch, Chrysler's 8.75-inch, and GM's 9.3-inch Hotchkiss-style axle for Pontiac and Oldsmobile. The simple cure when using wide tires with a stock-width rearend was to radius the fenders and let the tires hang out in the breeze. You must log in or register to reply here. Hoonigan Founder and Pro Rally Driver Ken Block Dead at 55, Worlds MOST Unusual Cars Ever Made, Found In One Warehouse, Lower the Bar ~ Perfectionism is Ruining the Automotive Hobby, 1971 GMC COE Fire Truck to Ramp Truck Car Hauler Build, Roadkills Best (and Worst) Drag Strip Tests, How To Choose the Correct Drag Racing Tire, 25 Tools and Gift Ideas Under $15 From Harbor Freight You Need, The Myths And Realities Of Carburetor Sizing, The Inaugural No Name Nationals Drag Race & Burnout Contest Coverage, Lawn Mower Racing ~ The Worlds CHEAPEST Motorsport, Quick and Easy DIY Headliner for Less Than $20, 1928 Ford Model A Coupe Goes From Yard Art To Driver, How To Turn Railroad Track into a DIY Homemade Anvil, New Docu-Series from Rat Rod Magazine ~ American Rust, Finishing a Late Friends Handmade 1956 Baby Buick Special Mini Car, Best 3-Ton Floor Jack? Shop Full Width; Shop With Sidebar; . trailer Cars from all the traditional drag racing classes are being built and/or restored, but among the most popular of these period-correct builds are the cars riding high on solid front axles and sporting fenderwell headers: gassers. In 1957, the Pontiac and Oldsmobile designs were combined and improved upon, producing a brand new 9.3-inch differential. 0000015097 00000 n %%EOF endstream endobj 19 0 obj<> endobj 21 0 obj<> endobj 22 0 obj<>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 23 0 obj<> endobj 24 0 obj<> endobj 25 0 obj[/ICCBased 36 0 R] endobj 26 0 obj<> endobj 27 0 obj<> endobj 28 0 obj<>stream well i have 1 from f 150 82 b/plate 2 b/plate it is 58". 0000000016 00000 n 4999 mm / 196.8 in, width: 1854 mm / 73 in, wheelbase: 2746 mm / 108.1 in; reference weights: base curb weight: 1653 kg / 3644 lbs ; . On Gen1, the code is "hit" on the right side of the rear axle (passenger side) with the inscriptions facing the front of . With perhaps less than 10 percent of Pontiac and Oldsmobile fullsize cars possessing the Safe-T-Track and Anti-Spin options, prices for unmolested examples remained high. It has the 4.75" bolt pattern, and ratios are usually 3.55-3.73, but sometimes you'll find a 3.36. '73 Ventura, '73 Mustang, '36 Plymouth, '54-56 Ford Pickup Good luck. The final drive ratio is identified with 2 or 3 letters codes. gasoline (petrol) engine with displacement: 5690 cm3 / 347.2 cui, advertised power: 216 kW / 290 hp / 294 PS ( SAE ), torque: 509 Nm / 375 lb-ft, more data: 1957 Pontiac Chieftain Sedan Tri-Power Hydra-Matic (aut. Wheel- Size.com The world's largest wheel fitment database. Originally posted by SUNNYD @Mar 22 2007, 10:23 PM~7534589. . Q: What cars did they originally come in? The actual width that I made out of wood was based on both the measurements I had taken with the loose wheels and my research to determine what widths were available for purchase. In this 489 case it is 3:91 gears and a 1 7/8 pinion. All correct GM codes and part numbers. to change without notice. * Ring #s GM 40 13 == 67 - 8 - A. Buick and Pontiac 10-bolt rear ends used flange-retained axles instead of the C-clip retained axles like those on Chevrolet rears. Its pretty easy to find a good one if you are in an area with a few junkyards. '72 Charger '67 Mustang 0000003369 00000 n Stop listening to your street rodder buddy and back away from the 9-inch. startxref How To Box-In a Differential / Solid Axle Rear-End Housing; . There is also a yellow stamp 10 22 which is the . I'm sorry if I repeated what I've learned to accept as fact, but there are other reasons besides what I've read that have convinced me that '64/'65 housings are narrower than the '66/'67. It has been my experience that the 66 up axle is longer. It has been my experience that the 66 up axle is longer. Mickey Thompson even produced aftermarket Olds and Pontiac magnesium gear cases that were frequently used in dragsters. Pontiac/Olds 9.3 parts are manufactured in the United States and are made in smaller custom production runs using high-quality alloys and the best materials available. Building an example that truly reflects what was around back then takes a certain passion for correctness. '72 Cougar According to an old article, Inside '64 -- '72 A-Bodies, (Car Craft Magazine), 1967 was a transition year in that A-body cars might have a 1964-66 style rear end, a 1968-72 rear end (which is wider, and commonly available), or a "hybrid" rear end, which will have the 60.5-inch width, but with the early spring mounting pad and trailing arm .