Gm 10 bolt ring and pinion contact patch

If the pattern runs off the edge of the gear, the contact patch is. Svl starts their ring and pinion sets with a computergenerated. For 10 and 12bolt units, the ring gear bolts are 716inch finethread bolts with a large 916inch hexhead cap. The differential carrier holds the ring gear and connects the pinion gear to the rear axles.

Another factor to consider is that some ring gear bolts are lefthand thread. Bulletproofing a chevelle 12bolt with currie enterprises. Used pinion bearings should resist rotation at the rate of 10 to 15 inchlbs. Sep 22, 2015 a pinion bearing is a mechanical element that constrains the movement of a pinion, a gear with a small number of teeth. Included are carrier bearings and races, pinion bearings and races, pinion seal, crush sleeve, pilot bearing, marking compound and. If you are changing the gears, the pinion depth needs to be set. The lighter duty will be a one piece cast unit and has a 9 12 inch ring gear. Gm also has another 10 bolt rear axle that went in a multitude of bc cars in the later 70s to middle 80s, plus s10 light trucks, camarosfirebirds.

When people usually refer to 10 bolt gm rear axles, they normally are referring to the common chevy 10 bolt with the 8. Fortunately, you dont have to play the guessing game when it comes to setting the pinion depth. A 10 12 inch ring gear will have bolts that will release the yoke assembly from the carrier. As you can see, the pattern left behind was nice and even. However, backlash may vary depending on the desired contact patch. Differentials improve engine performance and offer added traction when you want your 4x4 to take on corners and snaking trails with ease. When things get more serious, the rebuilds get more intense. When the pinion depth is set correctly, the contact patch will be centered front to rear on both the load side and coast side of the ring gear teeth. Engineered and manufactured for all makes and ratios, they deliver the ideal blend of coverage, performance, and value. Jul 01, 2002 read chevy high performance magazines technical article on installing differential gears in a chevrolet 10 bolt rearend. Please contact a strange sales associate to discuss your vehicle. Simple design, operation and reliability will always be a classic. Yukon gears are a high performance quiet gear, perfect for any gm 10 bolt 8. Other then the wider pocket spacing, the yokes were similar in height, and had the same spline.

For a more accurate result, take into account the flattening of the tires contact patch. However there are people out there who have ridden their 10 bolt right into 10 second passes in the quarter mile. Sep 19, 2016 a few other advantages the ford 9 has is that, well, it is larger than the chevy 12bolt. Lefthandthread bolts in the ring gear were used with some 10bolt units. Mar 24, 2015 when setting up the positioning of a ring and pinion in any rear end, there are only two settings that need to be donemeasured correctly to ensure proper gear setup and long gear life. Ring gear contact pattern interpretation of face hobbed uniform tooth depth gear teeth proper ring gear to pinion gear contact pattern is critical for quiet and trouble free gear set operation.

Lefthandthread bolts in the ring gear were used with some 10 bolt units. Rebuilding a 12bolt rearend to hold more power street. Some people will trash talk the gm 10bolt as a junk rearend, and if they are talking about the 8. This supposedly results from the cuts used to manufacture gear sets. Hot rods salisbury vs gm 10 bolt for daily driver the. For 10 and 12 bolt units, the ring gear bolts are 716inch finethread bolts with a large 916inch hexhead cap. We have several kits available for different types or cars. Differential assembly kits free delivery possible on eligible purchases. Two of our personal cars, a bolton 2000 z28 m6 with motive 4. For more indepth information about ring and pinion gear patterns and how to make adjustments, see our installation instructions page. The images below illustrate both acceptable and unacceptable ring and pinion gear patterns. Failing to properly follow the preload procedure can result in pinion bearings, and a ring and pinion that fail inside a few hundred miles. The biggest and baddest of the bunch was the chevy12.

The transmission yokes are cnc machined to assure concentricity and balance for ideal driveshaft operation. Strange engineering drag racing axles, rear ends, racing. The ring gear on the chevy 12bolt measures in at 8. How to install a chevy and gm axle assembly and differential. How to rebuild gears in chevy and gm differentials. Bearing preloads are equally important, but well address those particulars in a later article. Most midrange performance axles typically make use of a 1. Axle essentials part 2 mark williams enterprises, inc. Motive gear stock performance ring and pinions are excellent replacements for oe. Setting up the axles ring and pinion gears its one of those jobs that even the most experienced 4x4 builders approach with. Read up on gm 10 bolt ring and pinion installation instructions.

The 12bolt uses shims set between the carrier and carrier bearings to set backlash, which should ideally land between 0. These control arms from ssm performance are designed to bolt a 19641972 gm abody 10bolt or 12bolt rear end into a 19781988 gm gbody. Your differential is made up of a series of gears including the ring gear and pinion gear to synchronize the varying speeds your tires spin at during a turn. To do a rear end, a shop must have a bearing press, a differential dial indicator for minute adjustments, yellow torque paint to measure pinion gear contact on the ring gear and the most important thing is that they torque everything, and not use impact wrenches when reassembling. Final check of backlash, contact pattern, and preload. With pinion preload, gear backlash, pinion depth tool duration. Pinion shaft diameter first run steelnot recycled heat treated for best strength choose the best ratio for your application this ring and pinion gear set is for 1971up 10bolt corporate style rear ends. Ring and pinion gear selection for optimal performance. The final pinion position will be verified by using the gear contact pattern method. Additionally, this differential is found on chevrolet express and gmc savanna vans produced from 1973 to current day. Once the pinion gear is installed, position ring gear and carrier into housing to check backlash. I changed the 12bolt yoke over to the 10 bolt yoke so it would mate up with the driveshaft, obviously. They will not fit 196470 gm 10bolt rear ends with 8. Begin by setting proper pinion bearing preload, total turning preload, and ring gear backlash.

Everything needed was included except pinion nut and ring gear bolts, but these were available separately at reasonable cost. Gm gears will never leave a pattern like aftermarket gears. Carrier backlash, the distance between the differential carrier unit and the carrier bearing housing in the case, largely determines the contact area between the ring and pinion gears. Measuring ring gear contact patch on all hypoid differentials. Sep 22, 2012 this holds the pinion yoke, so you can remove it, and get accurate torque readings, on reinstall. With apologies to elizabeth barrett browning 1806 1861, and in all seriousness.

Once the pinion depth is set correctly you can then adjust the backlash. Techtips ring and pinion gear selection for optimal performance. Classic industries offers a wide selection of all makes parts, including all makes interior parts and soft trim, all makes exterior sheet metal, all makes moldings, all makes emblems, all makes weatherstrip and unique accessories, to nearly every nut and bolt needed for. Svl drivetrain ring and pinion gear sets make finding the right ratio for your application easy. General motors used bolts with different sizes and thread pitches for the ring gear. Monkey grip posi limitedslip differential gm 10 bolt 8. All gm 10 and 12bolt housings use an outside shim design for the carrier bearings.

Quarter panel patch 349 racing jacket 1095 racing pants 1016. Differential contact patch and pinion depth explained by the professionals at driveline master. The plan here was to upgrade the 10bolt in our pal larry richards 175mph 87 monte carlo. Classic industries offers a wide selection of 1985 chevrolet truck parts, including 1985 chevrolet truck interior parts and soft trim, 1985 chevrolet truck exterior sheet metal, 1985 chevrolet truck moldings, 1985 chevrolet truck emblems, 1985 chevrolet truck weatherstrip and unique accessories, to nearly every nut and bolt needed for installation.

Gm 10 and 12bolt units use shims behind the inner pinion bearing the large bearing inside the case. Adding a thinner shim to the pinion moves the pattern towards the outside of the ring gear. You must also never reuse a pinion nut or ringgear bolts. Follow along as our employee zach installs a gm 10 bolt rebuild kit from motive gear. Filthy motorsports carries a wide range of parts, gears, and upgrades for the gm 10. You can remove the pinion nut with a torque wrench, but the retorque must be done with a torque wrench. Gm cars from the muscle era were factoryfitted with a number of rearend combinations. Techtips how to rebuild gears in chevy and gm differentials. Strange engineerings heavyduty lines of sseries transmission and pinion yokes were designed by strange and are manufactured from usa made high tensile strength nodular iron castings. Adding a thicker shim on the ring gear side of carrier and a thinner shim on the other side means that the ring gear teeth contact patch will be greater you want more of a contact patch but make sure back lash is within spec. Differential contact patch and pinion depth explained. Mar 31, 2015 while this article focuses specifically on the gm 8.

Howto do a ring and pinion change silverado sierra gmc truck. Ring and pinion gear pattern is one of the most valuable tools for determining if a differential is properly set up. Home shop drag racing parts ring and pinion gear sets gm 10 bolt 7. Ring gear contact pattern interpretation of face hobbed. Always adjust backlash setting at the tightest point of the. Differential contact patch and pinion depth explained december 3, 2018 roadkill customs technical info differential contact patch and pinion depth explained by the professionals at driveline master. Simple friction and steel clutch plates, preloaded with a traditional stype spring. All models parts rear end differential hardware classic.

Gift certificates are available for all of your holiday needs choose vehicle. A pinion bearing is a mechanical element that constrains the movement of a pinion, a gear with a small number of teeth. Gm rear end gear oil for camaro, firebird and all other gm. East coast gear supply offers wholesale discount prices on gm 10 bolt 8. Svl drivetrain ring and pinion gear sets 2023917 free. A ring gear with 41 teeth that meshes with a pinion that has 10 teeth yields 41. How to set up your rear gear correctly racingjunk news. Oct 20, 2010 before you start, you need to identify your parts. Mark williams enterprises gm 12bolt rearend is built for. It will handle the rigors of big tires or high horse power. In this video diy guide, the fab forums go over how to install ring and pinion gears in a ford 8. Ring and pinion gear pattern differential setup sierra. A dial indicator was used to check backlash and contact pattern between the ringandpinion gear. The bearings on the pinion gear and differential itself can go out.