Timken carrier and pinion bearings, pinion seal, shims, ring gear bolts and cover gasket for a gear setup on a Chrysler 8.75 rear with the 741 housing.
If your Mopar 8-3/4 rear is howling on the highway, clunking on and off the throttle, or you are about to drop in a new ring and pinion, this is the bearing kit for the 741 version of that axle. Motive Gear R8.75RMAMKT puts Timken carrier bearings, inner and outer pinion bearings, their races, the pinion seal, pinion nut, shims, ring gear bolts, cover gasket and marking compound in one box, so the third member comes back together with nothing old left inside it. It is the kit for 1957-1972 Chrysler, Dodge and Plymouth owners whose center section carries the small-stem 741 pinion case.
The 8-3/4 is a removable-carrier axle: the gears, carrier and pinion all live in a cast iron center section that bolts into the housing. The 741 case uses the smallest pinion of the three 8-3/4 designs, with a 1-3/8 in. stem, and it sets both pinion depth and pinion bearing preload with shims rather than a crush sleeve. That makes the shim pack in this kit part of the job, not a spare. The carrier bearings in this kit have a 2.00 in. bore (LM104949 cones), which matches a factory open carrier or an aftermarket limited slip built for that size. Every bearing in the pinion and carrier is replaced, so the contact pattern you set on the bench is the one you drive on.
Pull the driveshaft and grab the yoke. Any in-and-out movement or gritty drag means the pinion bearings are done. Spin a rear tire with the car on stands and listen at the cover. Pull the center section and check the backlash and pattern before tearing it down, so you know whether the gears are worth reusing. Our Chrysler 8.75 problems and rebuild cost guide walks through the noises and what each one usually means.
The 8-3/4 was built with three pinion cases and they do not share pinion bearings. The 741 is identified by a large X cast on the left side of the carrier housing and casting numbers 1820657 or 2070741; it was used from 1957 through 1972. A large 2 means a 742 case, and a large 9 means a 489 case, which uses a crush sleeve and different bearings. If you have a 489, the Allstar ALL68531 489 installation kit is the one to look at instead. Check the casting before you order. If you are unsure, send us the casting number and the carrier type and we will confirm it. You can browse the rest of our setup kits in rebuild kits.
After new gears, follow a proper ring and pinion break-in before towing or hard launches.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Look at the left side of the carrier housing. A large cast X means 741, a large 2 means 742, and a large 9 means 489. The 741 also carries casting number 1820657 or 2070741 and has the small 1-3/8 in. pinion stem.
No. The three cases use different pinion bearings, and the 489 uses a crush sleeve for preload while the 741 uses shims. Order this kit only for a 741 case.
The carrier bearings have a 2.00 in. bore and fit a factory open carrier or an aftermarket limited slip built for that size. Older Sure Grip units used different carrier bearing cones, so measure the carrier journal before you order.
No, and a 741 does not use one. Pinion depth and preload are both set with shims, and the kit includes an assortment of pinion and carrier shims plus a new pinion nut.
Use 75W-90 gear oil. If the carrier is a clutch-type limited slip, add the friction modifier its maker calls for.
The kit includes a new set, and they should be used. Old bolts can be stretched, and a loose ring gear bolt can take out the gear set.
