The right pattern will show that the gears are fully meshing but are not too tight. Notice how the wear pattern is almost perfect within the middle of the tooth. This rear end uses adjusters arrow , to reposition the differential, and set backlash. They work by tightening one side and loosening the other side to move the differential sideways. If your rear end does not use adjusters, then you need to adjust backlash by using shims.
By placing various thickness shims on either side of the differential, you can adjust backlash. Reading this just blew my mind. Everything came together. I really cant tell you the relief that came to me when it all made sense. I was close to taking it in. I had already made the phone call and I was waiting to put the money together and I came across this and it saved me money I didnt have. Thank you so much. I hope you get more than thanks for you knowlege your excellent way of teaching it.
I really am greatful. Thank you. Hi Has anyone have this problem? We have a 9 in 31 spline ford in a race car.
This has happened 3 times Thanks in adv. Notify me of follow-up comments by email. Notify me of new posts by email. He then rechecks the pinion depth after setting the pinion bearing preload. Last is the carrier backlash and gear pattern which is achieved by installing spacers between the carrier bearings and the differential carrier bearing caps.
Grambo told me this is the easiest part of the process but it does take time and a "feel" for what is happening to get the gear pattern and backlash set correctly. Grambo is VERY detail orientated fussy so it takes him about six to eight hours to get a differential set to his standards. If it were me, I'd find someone who runs a race car stock car or drag car and see if they or someone they know would set the rearend up for you.
It would cost far less than a "professional repair shop" would cost given they would charge by the hour to do it. Steve Cooper likes this. Oct 31, 5. Messages: 1, Likes Received: Oct 31, 6. I brought the guy the rearend and all the parts, gears, Duragrip and complete installion kit when I took it out of the car.
Oct 31, 7. Messages: 6, Likes Received: I got to raise my prices. Install the completely assembled side gear with clutch pack into the differential case. Because there is no preload on pinion gears in the differential case, this is easy.
The factory-painted orange side gears distinguish themselves from other gears. Install the opposite-side gear with its clutch pack and shim in place. At this stage, nothing is holding the side gears in place, so they may fall out.
Some people install long bolts with washers to help temporarily hold the gears in place. Since this is just an assembly aid, the nut just needs to be hand tight. A second set of hands helps, but I have been able to do it by myself; it just takes more time and patience. Install the differential pinions with their spherical thrust washers in the differential case. Since the gears are just being partially engaged you can assemble them by hand.
Do not forget to include the thrust washers that go between the differential case and the pinion gears. Install both pinions at the same time and rotate the side gear to get the pinions to roll in place. The home-made tool that was shown on page 39 is used to rotate the side gear. It is just a piece of an old axle shaft with a square plate welded to it. Notice that this pinion gear thrust washer is in place between the pinion and the differential case.
The pinion gears must be aligned correctly, so the differential pin can slide right into place. Use a punch to push it through the pinion gear and into the correct position. Keep in mind, it is possible to assemble the differential gears one tooth off.
If installed one tooth off, the differential pin does not line up correctly left. You want the pinions to be degrees apart and aligned to the correct side gear. So take the time now to make certain that the pin goes easily in place right. It will be obvious if you are a tooth off. If so, just remove the pinions and index by one tooth with the side gear.
Once the differential gears align correctly, remove the differential pin and install one of the two S-shaped preload springs that came with your kit. The car unit was used from to while the truck version was originally used in the Cobra and all and-up V-8 Mustangs. Keep in mind that the downside to a tightly assembled and heavily preloaded limited-slip differential is additional wind-up and potential chatter and pops as the plates transition from sticking to slipping.
Wear safety glasses.
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