How hard is rebuilding the stock LSD?

[Blackmk3]

ive done a short search and hasnt really triumpthenth with much...just people saying to shim up the clutch packs to make them tighter...

What ive got is a 89 turbo hardtop, and the stock 3.7LSD packed up so ive repalced it with another 3.7 thats all fine

but ive also aquired a 4.5LSD its out of a mk3 but it has 4stud axels compatred to my turbo having 6, so im guessing it came out of a NA 1gge Supra, what i am wondering is that will i be able to swap the LSD setup from the 4stud diff into the 6stud? so i can have a spare with a higher ratio

The 4stud axels are much smaller than the 6stud, so im just wonderng if anyone has swapped this over?

how do i pull the diff apart? is there a instruction manual or something someware

Thanks for ur help
Nick

 

[starscream5000]

4.5? The only one's I've heard of for the NA are the 4.3 open differential, and the 4.1 LSD... Check the TSRM, it may cover how to service the LSD...

 

[dav_dman]

i thought 89 was the 3.91...90 up the 3.73? what gives?

 

[7MsuprO]

I think 87-88 turbo cars had 3.91's and 89 up had 3.73's

 

[ma71supraturbo]

It may be a 1g car, but I'm thinking its probably from a MK2. Either way, it's going to be a weaker lsd and I would avoid putting any real money into it if you don't have to

 

[Blackmk3]

My car is a JDM GT limited so it may differ from your guys amercian only versions...it had a G305 transcode and last time i checked and what i can remember its a 3.7..but maybe its a 3.9 as you say

The other diff i got was defantly off a mk3 and has the same size crown wheel etc and i only bench tested it to be around 4.5 so i could be wrong.

TSRM u mean by the online supra manual?

 

[starscream5000]

^Yes, online supra manual, it may have some info on servicing the LSD .

 

[Jeff Lange]

Sounds like the 4.5:1 axle is a 7.5" diff out of a GA70. You'll want an 8.0" LSD IMO.

 

[jdub]

Here's the various differential options for the Mk III
http://www.mkiiitech.com/forums/viewtopic.php?t=40

Here's the section in the TRSM that applies to differentials...you may need special tooling depending on how deep you go into this.
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=RA&Page=23

Might be a good idea just to bite the bullet and let someone like JawsGear (that specializes in this kind of stuff) do it for you.

 

[TurboStreetCar]

replacing the clutches doesnt look that bad, doesnt look like it would require any adjustment of the r&p.im gona buy clutches and redo mine over the winter most likely.