I agree with Roy, the 10-bolt is not worth spending the $$ on. JA: Narrowing a rearend isn’t difficult if you have some experience and some specialized tools. Usually if around $100.00 to $150.00, but BEWARE. Follow along as we take a look at how that happened by the pros at Fearless Gear. Here we have the tools needed to hold 8" Ford, 8.8" Ford, 9" Ford, 1976-88 7.5" GM, 1971-88 10 bolt GM and 1964-72 12 bolt GM rearend housings in alignment when you are narrowing… Posts. Fortunately, you don’t have to play the guessing game when it comes to setting the pinion depth. You just need to do the final dial-in. • I lost somewhere around half the videos I had. Known for having transformed more ’99-up “slim jobs” than anyone else around, we wanted to get the skinny (no pun intended) on how to narrow a GM rear end. See all 28 photos. I already bought a detroit locker with 4.56 gears and a master install kit. Some people will trash talk the GM 10-bolt as a “junk” rearend, and if they are talking about the 8.2-inch, then they are not far off. GM 8.5 10 bolt - 10 bolt cover, 8.5 ring gear, 10 ring gear bolts, 30 spline pinion, c-clip axles could be 28 or 30 spline, referred to as the GM 10. The 8.5" 10-bolt GM rearend has a 30 spline pinion, uses C-clips, and could have 28 or 30 spline axles depending on the year (30 spline axles were used after 1988). Like the 8.2-inch 10-bolt, the 8.5 10-bolts use C-clips to retain the axles. These basic steps should pertain to most GM rear differentials and if followed with leave you satisfied for many miles. Allstar Differential Pinion Seal for GM 8.5 inch 10-Bolt Pinion fits a GM 8.5 inches 10-bolt pinion. No (8) Yes (4) Line Up Bar Length. (1) GM 7.6 in. GM 8.875 in. 10: On a 10-inch-wide rim, running a 295- to 305-spec tire, the back spacing will equal 6 ½ inches, giving the look of a deep wheel, without cutting the wheelwells. (1) Chrysler 8.75 in., 741 case (1) Chrysler 8.75 in., 742 case (1) GM 10.5 in. That's how the rear in my '32 2dr was done. It was put under the Suburban so it could tow a 10000lb trailer, which is not your application either. Price for narrowing the housing varies greatly, from what I have seen. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. $334.00. Enter the custom truck enthusiast, whose goal is to customize his or her vehicle to their own liking in a quest to stand out from corporate vehicle conformity. Since both the 8.2 and 8.5 10-bolt … To start viewing messages, select the forum that you want to visit from the selection below. We offer the most complete line of rear end parts for the GM 8.5" commonly referred to as the 10 Bolt differential, this differential was utilized GM used this very popular differential in there full size Chevrolets, Chevelle, Chevy II, Camaro and and GTO/Firebird Pontiac products starting in 1970. Housing End Alignment Kit (Mopar) Product Code: 300M. The GM 10- and 12-bolt rearend housings use the axle as the inner bearing race. Even though it has been used in every major GM rear-wheel-drive platform, the 10-bolt has a bad reputation for being a low-performance unit. Brand: LMP. It was important to us that we have the best of both worlds: the look of a deep wheel, while still maintaining some of the OEM specs. A 14 bolt's great features come at a cost - they're strong, but also heavy. That’s what we set out to find when we stopped in at Fearless Gear located in Fresno, California. This pushed out the mounting surface, thus leaving the “deep lip” styling behind with the earlier-model vehicles. This is best done with a jig of some sort, which includes a machined shaft, anchored by the carrier caps. Product Code: G885308. Some people trash talk the GM 10-bolt as a junk rear end, and if they are talking about the 8.2”, then they are not far off, but the 8.5” 10-bolt is actually just as strong as a 12-bolt or Ford 9-inch rear, with only a fraction of an inch difference in the ring-gear diameter. Will hold 400 … Although the 8.5- and 8.6-inch rear axles are more than capable of handling 400 hp (and with some setups a bit more), the 10-bolt name has a bad reputation due to the inherently weaker 7.5 and 8.2 designs. 14 bolts Typically have a 1/2" thick axle tube and the typical 14 bolt is probably about twice the weight of a Dana 35. 4.5 out of 5. 4 wheel drive 8.5" front differentials manufactured between 1977-91 share the same differential gears, bearings, and pinion seals but has a modified housing and cover which has an indentation to clear suspension travel. (14-bolt) (1) GM 7.5 in. Diameter, Chevrolet, Ford, Chrysler, Dana, Each. $606.00. (2) 72.000 in. But the 8.5-inch 10-bolt is actually just as strong as a 12-bolt or Ford 9-inch rear, with only a fraction of an inch difference in the ring gear diameter. 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. Alot of folks have been narrowing the explorer and the ranger ones. $165.00. MADE THE AMERICAN WAY IN THE USA! The pinion shaft diameter is 1.625 inches and will have either 28 or 30 splines. They came with a 3rd shock that was longitudly mounted to help control axle wrap and try and keep some kind of traction (which I think you could also get without the 8.5). But with 20x15 or 24x12 wheels a web click away, you can pretty much let your imagination run wild. Dave, You can narrow a 10 bolt by getting a donor rear (8 3/4 Mopar works good) and narrow the donor axles and put the chevy spline on the end. The 10 bolt is a 1/2 ton axle with 8-lug hubs. … I will attempt to cover the necessary steps in building a differential for a GM 10 bolt rear end with an 8.5/8.6 ring gear. Fitment: 1972 – 1989 GM 10 bolt C-Clip 8.5″ 1.20″ 28 2.73 & up. Axle Housing Narrowing and Alignment Tools, Jig Shaft, 60.00 in. Here we have the tools needed to hold 9" Ford, 8.8" Ford, 8" Ford, 1976-88 7.5" GM, 1971-88 10 bolt GM and 1964-72 12 bolt GM rearend housings in alignment when you are narrowing, assembling or changing the width. 7111 - Performance Cover - 12 Bolt GM Truck. Find a good 12-bolt and you will be much better off. Richmond Differential Side Bearing Shim Kit; The kit says “Ford” in the description, but It fits: Ford 7.5 in./GM 7.5 in./GM 8.2 in./GM 8.5 in. 7110 - Performance Cover - 12 Bolt GM Car. A point to clarify before we go on is that this modification isn’t just for owners of 1999-and-up GM trucks; narrowing an axle to fit a deep lip wheel knows no boundaries when it comes to age. Length, 1.50 in. Approx. SAME DAY SHIPPING (if ordered before 2pm EST) Add To Cart. cost of narrowing a 12 bolt; If this is your first visit, be sure to check out the FAQ by clicking the link above. One pair of bushings or rings that would fit in the 8" Ford, 9" Ford, 7.5" GM and 10 bolt GM differential case that measures 2.891". Most people don’t think about replacing the U-joints on their truck unt... We’re almost wrapped up with Project Over/Under and we’re upgrading t... © 2021 TRUCK TREND NETWORK | MOTOR TREND GROUP, LLC. Play the guessing game when it comes to setting the pinion depth rear... 24X12 wheels a web click away, you can pretty much let your run. 10-Bolt is not particularly straightforward is best done with a Jig of some sort, which includes a shaft! Carrier caps have a much stronger rear and bigger brakes shall fear no amount of boost, for,. Without Narrowing it in a 62-67 housing tube bearing bores ( race.! 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