Supra LSD into an open V6 3rd
(12 640x480 low res pics loading)
July 27 2005....updated 8-4-2011
As received from David in Tennessee. The V6 in the right box has been triple boxed. Lotsa cushion...even UPS couldn't damage this. :)

Supra clutch rebuild kits available at

David wants the LSD on the left installed in the V6 on the right...the V6 happens to have the factory 488 thin gears but the LSD will go into most any truck V6 from about 88~95ish. This particular one is out of his 1995 V6 Runner.

The very first thing I noticed is that there was no carrier bearing pre-load at all. I use the one finger test....if I get movement by just using a finger then there is no CB pre-load. No pre-load means no strength....means ring deflections....means teeth will fall off the ring like autumn leaves.

I only needed one measurement before swapping the LSD in.....backlash. I needed to know what BL the ring and pinion were burned in with. I wrote it down someplace where I would not forget.

The carrier bearings on the LSD were damaged....and the cups were missing so I fortunately had a spare Supra fat bearing left over from Stace's job (FYI- Supra fat bearing genuine part number is 90366-50001). A quick inspection inside the LSD revealed all was good. Metal clutch plates really hold up well. By the way, this differential bearing remover/puller is about the best 60 bucks I've spent.

The pinion wasn't loose and felt smooth so there was no reason to disturb it.

Truck diff on the left.....Supra on right.....the ring gear mounting surfaces are real close but due to the extra distance the carrier bearing presses on on the lower right means a "fat" bearing needs to be used there to get the ring gear up against the pinion again. That's where the Supra bearing is needed. This avoids any kind of machine work that was mentioned in some other articles.
Thin bearing--V6 trucks--KOYO TR100802-2-N(90366-50007)
Fat bearing--Supra carriers--KOYO TR100802-N or Nachi 50KB8301(90366-50001)

I always use Blue Loctite on the ring gear the threads have to be clean. I use starting fluid and chunks of paper towel for this procedure.

It's just so much easier getting the carrier bearings TIGHT with the use of anti-seize. Thread resistance/friction is reduced and the spanner wheels snug up much better.

I like leverage. I will get these tight....I just know it!

This is a little 'secret' for letting the bearings "find their set". By carefully tapping on top and rotating the pinion at the same time, the tension and the rollers will find their natural position. If this is not done then BL and CB pre-load may shift 100 miles down the road.

Something to keep in mind when trying to load the 3rd into the housing....because there's 2 or 3 threads sticking out on the non-ring gear side means the housing or the spanner wheels may need a minor touch-up with the sanding disk like I did here in order to fit it in. So, with the freshened up carrier bearing pre-load, this used 488 ring/pinion should hold up great and David will enjoy the increased traction. Since this is the rear that sees all the use and heat, I will recommend that David use a synthetic like Mobile 1 or RedLine. :)