Fabcraft can also supply an excellent manual that tells you everything you need to know about these rearends, along with instructions on overhauling them, or they'll refurbish a rearend for you. 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. The following information is provided to help you identify the differential you are working on. And even though new internals were available from Fabcraft, the carriers were simply becoming too difficult to find. Rusty but Rare 1976 Chevy K10 Sport Truck Revival! It has the 4.75" bolt pattern, and ratios are usually 3.55-3.73, but sometimes you'll find a 3.36. Valves. It is a little better than the Camaro 8.2 10 bolt. A: Starting in 1937 Pontiac and Oldsmobile rearend designs slowly began to converge, to the point that in 1957 all major components were virtually interchangeable, with the exception of some brake components, suspension attachments, and axle housing/axle widths. 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. Rear axle widths. Like most american muscle cars of the Day the Pontiac GTO was a front engined rear wheel driven car. Compared side-by-side with the Chrysler, it boasted stronger gears and larger bearings. the versailles / granada rear ends from flange to flange is 58.5". '66 Falcon, '69 Chevrolet '69 Javelin Six , '70 dodge The high-volume production runs of Ford-9 inch components allow them to be relatively inexpensive. charles coker, 1953 pontiac tech advisor. This information will change as further information and corrections become available. <<3d7f7a4e8421a74f9b85ec848848f3a1>]>> For some time, only a small handful of ratios were available in new gears. 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. The 1967 GTO came in 3 speed Automatic and a 4 Speed manual. '67 Mustang As a result, many tribute cars and gasser-inspired builds had to stray from correctness. Pontiac Differential Codes Year Model Rear Ratio Tooth Count Std Code Posi Code 1970 Big Pontiac 2.56 41/16 UC VC 1970 Big Pontiac 2.73 41/15 UD VD 1970 Big Pontiac 2.93 41/14 UE VE 1970 Big Pontiac 3.23 42/13 UG VG 1970 Big Pontiac 3.42 41/12 UH VH 1970 Firebird 2.73 41/15 CRX CRY some Chevy's Dana 44 or Dana 60 with leaf springs 6 lug, Gear ratio's Year. 1985 to 1989: 7.625 inch ring gear, 26 spline axle. 0000002353 00000 n Vehicle. Wheel Stud *. . 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. 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. There is also a yellow stamp 10 22 which is the . Identified by casting number & number of cover bolts. The1971-'72 Buick GS/Skylark and Olds Cutlass A-body 8.5 10 bolt did not have C-clip axles. 1982-1997. Interest in vintage drag racing is now approaching a rapid boil. I'm not sure of the also note on the A4's (auto's) shifter console if the gear selector for 1 is missing. 70 2wd 6 lug rear end 12 bolt Possible gear ratio's Dick this in no way reflects upon your statement but you make an excelent point when you stated " I read enough times that". Mercury Capri/Bobcat, Monte Carlo, Regal, etc. Six-cylinder truck engine block and head casting numbers. It'll help you sniff out the right parts and will walk you through building the differential for your gasser project. I ordering the axles from Bears Performance who kept thier promise of delivery in about a week. 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 " "" "" ". 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 . plate to backing plate. 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GM 7.75" (Australian - Some 3rd Gen Camaro/Firebirds) GM 8.0" - Rear - Late Model Midsize Truck Ring Gear Diameter: 7.75" Ring Gear Diameter: 8.0" Pinion Diameter / Spline: 27 Pinion Diameter / Spline: 1.781" / 27 Ring Gear Bolts: (8) Ring Gear Bolts: (10) 7/16"x20 LH Cover Bolts: 9 Cover Bolts: 10 Carrier Breaks: 2.77 / 3.27 Carrier Breaks: None Once I had determined the desired width with the loose wheels and tape measure I constructed a wood rear end out of a 2x4. var t=new Date(); In searching the web I found the following links that have a massive of information on rear end widths and wanted to share. Vintage 1980 Yamaha Enticer Snowmobile Revival to Former Glory. If you're running a blower, turbo, nitrous, etc you will probably want to step up to a larger rear like a 9" or 12 bolt. I've read enough times that '64/'65 are 54.25" and '66's are an inch wider that I believe it. These dimensions do not include brake drums and are measured from backing plate to backing plate. If you would like to compare the fit with a couple of different widths build your wooden rear end for the narrower width and then add shims to the ends to change the width. Bigger engines introduced in both Oldsmobiles and Pontiacs for 1959 prompted the second generation of these rearends with 31-spline axles, which were reportedly 22 percent stronger than the previously used 29-spline shafts. 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). pontiac rear end width chart. Check our the Chevy rear end gear ratio chart above to help you identify the correct gear to use. sized GM Car, Malibu/Monte Carlo (82 up Metric Studs), 80 Granada & Check here to see if your engine is correct for your year truck. 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. 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. Rear Wheel: Production Years for Series : 1964 - 1967 : Price : $2,437-$3,095: Weight : 3015 lbs | 1367.581 kg: Performance. '74 Valiant, '57 Ford var u='http://50chevy.freeservers.com/cgi-bin/sitestats.gif?p='+escape(location.href)+';r='+escape(document.referrer)+';t='+t.getTime(); Information provided by:Joe GarciaThe Resto Rod Shop. How to cut your Ford F100 long bed to short bed in a weekend DIY project ~ Two-Part video details cutting frame and bed. 1958-1970 Chevy Rear Differential code Identification : Using the charts below, you will be able to learn alot about the rear differential in your classic full size Chevy. It has an M-21 four speed and I am ready to upgrade the rear diff. 41/14. } While not as strong as a race-dedicated spool, the 31-spline Trophy Track carries a potent arsenal, including six 9310 alloy gears and twin cross-shafts, all of which are dimensionally larger and stronger than anything offered previously. Find your GMC/Chevy vehicle in the chart below and click on the illustration for a larger view. For die-hard purists, it soon became a difficult proposition to build a worthy P/O 9.3-inch as aftermarket support subsided and the supply of virgin factory parts withered. Roadkill Customs has evolved from local hot rod shop to online how-to magazine for budget-minded do-it-yourself hot rod builders and enthusiasts. Wilwood Engineering designs and manufactures high-performance disc brake systems. Vintage 1980 Yamaha Enticer Snowmobile Revival to Former Glory. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass. "+j)(4 T "Hd&6F T:R%xA+R>6^yyp0}Zc9^):(cdf_rKr2zB,ywV}w0*lkxwM y icR,2*G{>K\"|>XWAIRYQ_dKx}wt}_=/3=)>fQaa-# C+|prj~%ox$LpKaGPG&T`o. 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. 6 lug rear end 12 bolt Coil spring set up Possible gear ratio's 3.70. The Firebird rear end would have been a BOP 8.2 10 bolt. It has been my experience that the 66 up axle is longer. However, the 9.3-inch differential was saved from obsolescence by a Texas-based company called Fabcraft Metalworks and its owner, Brad Duerst. To say I was disappointed by the service provided by this company would be an understatement. For a better experience, please enable JavaScript in your browser before proceeding. Very hard to find set, being as this is version is not being reproduced. I have a source for the axleshafts and the difference in the shafts shows this to be true, BUT doesn't show the diff center . Originally posted by SUNNYD @Mar 22 2007, 10:23 PM~7534589. On early street rods it wasn't unusual for the rear of the car to be jacked up so wider than stock tires could protrude several inches past the fenders, but then styles changed and the need for a narrower rearend that was reasonably strong led many hot rodders to the '57 Ford 9-inch, particularly those under wagons and Rancheros as they were the narrowest. If it has the original Borg Warner posi then it is stronger than the Chevy 10 bolt. Chevy 10 Bolt Rear End Widths. What is the width of a 1959 pontiac rear end? if you dont have a versailles just a regular 9 inch rear end,, that is also 60 ". $1,825.00. Copyright 2023 Welcome To Rodplans! 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. 1969. used a 3.21 Dana 44 used a standard chevy 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 10-bolt was used in all the low performance applications. I placed the order with Speedway motors in late July for my rear end housing and Currie axles. * Ring #s GM 40 13 == 67 - 8 - A. Aftermarket support followed in the form of beefy axles, gears, spools, couplers, and Mickey Thompson's aluminum and magnesium centersections. 4.24 out of 5 stars. Rear End Widths - - Back - - Home > Specs > Rear End Widths : Representative for comparison purposes only. var I=new Image(1,1); I.src=u; '72 Cougar Contributing information were Bob Welch, J 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. 3:08, 3:40, 3:73 Fits 41-52 Olds, 50-55 Pontiac : 1310 to 1330: MORE INFO: 3.219 x 1.062: Outside Snap Rings: Converts To: 3.625 x 1.062: Outside Snap Rings : You are using an out of date browser. i've seen that link about a hundred times now and it's kind of funny how the 73-77 GM A-body is not included. 18 21 Good luck. The correct width for 59' & 60' is 63-1/4" I believe. GM / Chevy - Differential IdentificationShop by your differential. '70 Duster Correct two piece design posi unit, exact for only 67 - 69 Firebird 10 bolt 8.2 rears. 1310 yoke, Dana 60 used the heavy duty yoke which takes the larger 1350 yoke. 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. Outside of flange to outside 54.25" 66 up are wider. 100 x 4.12. If in doubt, consult one of our differential experts at (800)510-0950! Vehicles with Similar . Another factor that made these rearends popular was the wide selection of factory gear ratios available, 2.56:1 through 4.30:1 while even lower drag racing cogs were available from aftermarket suppliers. (rear-wheel drive), automatic 3-speed gearbox . 0000000991 00000 n list of rear ends and their dimensions to help narrow the search for a possible '55 -57 Chevrolet, 68-69 Fair lane 6 or 8 If you're building a period-correct car, especially a Gasser, they are undoubtedly the perfect rearend for today. Picture is from parts book. SiteStats_3379(); ends with widths ranging from 58"- 62". '72-73 Mazda, '28-40 Ford , '57 - 59 Ford 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. Additionally, it can be a relatively affordable way to enjoy a day at the track. Post: rear end width chart (Topic#173541) greg pharr Contributor Posts: 897 Loc: North Mississippi Reg: 07-09-03. to change without notice. Axle Images: Axle Details. Housings with leaf springs were used under Pontiac and Olds in 1957 and Olds only in 1958-60; Pontiacs had coil . I'm not sure of the Task Force width ranges at this time. (Rear Wheel Drive) +20 offset. Forbes and various locations throughout the Web and Automotive Magazines. Rim Width Measure from the inside of the outer lip at the bead seating point to the inner lip. Brand new gears in ratios from 3.42 through 5.38 could be purchased and mounted on a new forged-steel spool with 31- or 35-spline axles. I would like most people place the wheels and tires under the car and use a tape measure to determine the distance from wheel flange to wheel flange. Calculating the torque multiplication that your axle gears provide is quite easy. Learn more. In 1957, the Pontiac and Oldsmobile designs were combined and improved upon, producing a brand new 9.3-inch differential. 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. BOP, Pontiac, Each. Snap On vs Daytona, Pittsburgh, ESCO, Husky, More. Rear-end questions. 0000001170 00000 n '69 Cougar, '71 -73 Nova While the Ford 9-inch is the perceived benchmark of popular rearends today, in stock form the edge would go to the Pontiac/Olds. In 1958 a good thing got better when limited-slip differentials were offered. "" "" ". Q: What cars did they originally come in? The P/O rearend and parts were getting harder to find and there were more Ford 9-inchers being made every day. 0000000716 00000 n ZE reg-duty / 4E med-duty 4-pinion. Model. 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. Part Number: YGA-21289. With its larger bearings, larger gears, and larger axles, the P/O 9.3 would fall somewhere between the Ford 9-inch and the Dana 60 in terms of strength. For many years prior, Olds and Pontiac differentials had been a dominant rear axle in drag racing and other motorsports. Registered: 16 years ago. '69 Javelin Six, '39 -48 Chevrolet CK 15/35, S10, RV. Privacy Policy. 0000006915 00000 n The other drawback is that you can only check for clearance at the height the jack stands are set to. Floor jack permits you to raise and lower wheels to check for clearance. GU3 - 3.08's V6 gear ratio. It's not to the same level as a concours-correct restoration; no judge will deduct points for an incorrect paint code. By 1965 GM replaced the 9.3 with a Spicer design using an 8.875-diameter ring gear that mounted the internals in the axle housing rather than a separate carrier. . 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 . Under the hood, Pontiac installed a 2.5 . You bring the gumption. ?|-Zce14^nF%67( }fSRaQfqX?|{8{>? VX5EX=b :"-'k>.VbyV^-nWxv-WgUtpo>sMhlI4ZV<4+s>|2k>\x{7M^^x. Please select a rear end that matches your vehicle below.General Motors has a wide range of front and rear ends! 3.08. The S10 10bolt 7.5/7.625" rear end is a good choice for the light low to medium horsepower small block cars. Snap On vs Daytona, Pittsburgh, ESCO, Husky, More. 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. . 5D med-duty 4-pinion. Rear Suspension Width (Flange to Flange), Donor Vehicles Front and Rear & Conditions, Ford Mustang II/Pinto & Mercury Capri/Bobcat, Monte Carlo, Regal, etc. Understanding Aluminum Heads and Spark Plugs, OK Go Needing/Getting ~ Its All In The Timing, An Online Magazine for DIY Hot Rod Builders. Mickey Thompson even produced aftermarket Olds and Pontiac magnesium gear cases that were frequently used in dragsters. Approximate rear end widths measured from backing plate to backing plate. The dana pinion stands forward about 2" more than the 9 1/4, the driveshaft will need to be shortened accordingly. So why did the Ford 9-inch become the premier differential of modern day hot rodding? Add Width to 40/13. GM 10-bolt rear ends have four basic ratio choices: 2.73, 3.08, 3.42, and 3.73 . Actual wheel track could be as much as 6" to 8"depending on drum size: '67 to '70 Mustang/Cougar 6 cyl. 57" 71-74 V-8 Mavericks 8", All '75-77 6's & 8's Maverick 5 Lug 8", 49-51 Ford, 57-59 Ford 9", 58" 78-88 Mid sized GM Car, Malibu/Monte Carlo (82 up Metric Studs), 80 Granada & Lincoln Versailles, 67-70 Mustang/Cougar/Fairlane, Regal with 10 bolt axle, S-10 P.U., 65-67 Nova, 60" 55-64 Chevy Car, 67-69 Camaro, 64-67 Chevelle, 68-74 Nova, 71-73 Mustang/Cougar, 84-95 Corvette, 60-61" 64-69 1/2 ton 2wd Chevy/ Some GMC 6 lug rear end 12 bolt Coil spring set up Possible gear ratio's 3.70. Rey Payumo of Kailua, Hawaii found this 1963 Chevrolet Impala packed with junk in a garage in Hayward, California. The non C-clip 8.5" 10 bolt, type "C" rearend was used in some 1969-'72 Pontiac GP and 1970-'72 Monte Carlo. ). 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. These smaller volumes and domestic content result in slightly higher prices. '72 Cougar, '74 Pontiac '49 Plymouth, '61 Chevrolet Impala '65 Cadillac, '66 Buick Wildcat '66-67 Chevrolet Big Car, '72 Charger Dec 26, 2008. You must log in or register to reply here. The housing came in a couple of weeks but without the axles. It has been my experience that the 66 up axle is longer. The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. 0000000911 00000 n Many Ford 9-inch parts are made offshore; they have smaller bearings and smaller diameter gears requiring less material. 70-81 4wd 6 lug reared
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