I have a 2002 Tahoe 4X2. Looking to replace the diff. with an Eaton but need to know for sure.... Do I have a 30 spline axle 8.5" 10 bolt? I counted the 10 bolts, so I'm pretty good on that but the others I'm not sure.
Thanks,
Chris

 

lol good job.. yep its a 10 bolt. 30 spline.. 8.5 or 8.6 is fine. I think you need a bearing kit. I'm looking it to doing it all over again with a new project soon.

 

eaton posi #19559 is what you will need. anyone know which bearing kit it uses?

 

The Eatpn 19559-1 will be what you want. You use a regular 8.6 bearing kit with that (99-up).

 

Carrier bearing # LM 603049
Carrier race # LM 603012

both are timken part numbers.

 

I was told that the used Eaton posi I am looking at will require new side bearings, and a rear cover gasket, and synthetic gear lube for the reaar diff. Does this sound like all I will need, also does Timken sell these parts seperate or would I have to buy an entire rebuild kit? How much $$?

 

If all you are doing is changing the diff case, then you will need all that plus carrier shims, lock tite, new ring gear bolts, posi additive and NON-synthetic gear lube. You can buy all that stuff seperatly. Those bearings are just the regular stock 99-up bearings, so they are a very common piece. If you wanted to replace all the bearings while you were in there then just buy the whole kit, but it is a lot more work. You can buy that stuff in a lot of different places that specialize in diff's, like Randy's, National Drivetrain, Nationwide Performance, Ratech, etc....

 

If your differential is quiet and in good shape all you need is new 8.6 carrier (2) bearings/races,re-use your selective shims.8 out of 10 time you will not need to change the shims for the correct backlash.Do not use sythetic gear lube,use 2 bottles of Ford posi additive XL3.Vavoline make a blended gear lube that works well.

 

The factory shims are one piece, and not a selective shim pack. Chances are they will not work with the new case. Also, the bolts are not designed to be re-used, so they should always be replaced. Better to have everything you need than start working and not have it.

 

8 out of 10 times the factory shims will work pick up selective ones just incase.This was info direct from the head tech at Randys ring and pinion.Odds are the OE shims will put you in spec.I found it to be true with the two I did.