Upgrade to a Powertrac LSD

I probably know the answer to this but still asking. I will adding a SC soon and was looking to also do a LSD. Now I will be staying the OEM gear ratio and only adding a Powertrac. Since the gears will not change, do I still need to do all the shimming and preload stuff? I had it done a long time ago to a GM rear but I did a LSD and gears, so shimming and preload was a must.

 

Toyota 3rds use spanner nuts to adjust preload/backlash. The only shims are for pinion depth.

 

It depends but the answer is to plan on it. I installed an Auburn LSD 6 or 7 years ago and my installer was able to reuse everything including the factory shim setup. It is still alive and kicking but I have a Powertrax waiting to go in. I have a feeling my recently installed supercharger may put an end to the Auburn.

 

Tundra rear diff if all you’re doing is replacing the carrier, then just adjust carrier bearing preload and adjust backlash. The lash and preload use shims. Many times you can simply reuse factory shims, but you need to be prepared to make an adjustment. If you reuse oem bearings, then don’t go over 5”#’s of carrier preload. 2-3”#’s would be ideal. Then adjust lash to about 8 thousandths. New bearings, 6-8”#’s is ideal and lash about the same. Only time you would need to adjust pinion depth is if you replace the pinion bearings. Even then, the factory shim will probably be spot on. But you will need to adjust the shimming on the solid collar. Contact ECGS for any shims and bearing help

 

this is true for the 8” diffs, but not 8.4’s or the 10.5’s along with plenty of other Toyota diffs that use shims for carrier preload

 

this is a 10.5 third member… it has adjusting nuts for carrier preload…

 

The 8.4 and the e locked 9.5 diff in the cruisers are the only ones I’m aware of that use shims instead of adjusters, I’m sure there are others

 

4Runner 8.2

https://www.instagram.com/p/CeYhdcbu3cw/?igsh=MThpNDE1MThyYzFzNw==

 

Tacoma 8.75

https://www.instagram.com/p/CeGlH-GON9p/?igsh=dTQ4ZnJhN2xlZXdv

 

Tundra 10.5

https://www.instagram.com/p/CFUfKfCn2uT/?igsh=bnFuMXVhZW96eXBq

 

Tundra 10.5 uses shims, did mine a couple years ago.

 

that’s not a tundra 10.5 diff. That’s probably an LC diff

 

That Tundra diff is heavy, especially after you put a traction device in it.

 

Thanks for clarifying, I thought this was the case, but not sure enough to refute the above comment.

 

Ahh, you’re right my bad, I wonder if it’s stronger than the spanner nut style

 

Yes, I’d say you can get better results from shimming than from the adjusters. The adjusters are easier to set up, but they can still have a chance to move a bit. Not much, but a little bit.