BRZ rear differential ring and pinion options (Help!!)

[Flateightysix]

Originally Posted by Clash0901

I actually just ordered an is300 rear diff. LSD and 3.73 with 115k miles from Cali so rust free as well.



Hopefully this is enough and hopefully it bolts right on as people claim.

Hopefully everything swaps pretty easy. good luck let us know how it goes.


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[fika84]

Originally Posted by Flateightysix

I know there are a few write ups on here where people have swapped either a mark four Supra diff internals, or swapped the pumpkin and internals from an is300 that has an lsd and have lowered the final drive to 3.7 or 3.9, but there are no detailed write ups on the Supra conversion or swapping the is300 diff. I do know that it has been said the is300 diff mounting pints are the same as ours. I think @mrk1 or @mr1k had the is 300 diff on his car.


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I bought a used is300 pumpkin and swapped weir 4.88 gears for the Supra 1986.5-92- ALL on their website along with the solid spacer instead of crush washer and MFactory Mechanical LSD. Then it's just a matter of ordering a bunch of shims and taking your time to set the preload and backlash. I still have my stock pumpkin intact sitting in the garage. All in all it goes smoothly as long as you take your time. So to answer your question. Yes you can take the gears and/or lsd out of the is300 and also use it in our pumpkins. They are identical on the inside.

[fika84]

Originally Posted by Clash0901

I actually just ordered an is300 rear diff. LSD and 3.73 with 115k miles from Cali so rust free as well.

Hopefully this is enough and hopefully it bolts right on as people claim.

See above, but it will bolt right up

[Flateightysix]

Originally Posted by fika84

I bought a used is300 pumpkin and swapped weir 4.88 gears for the Supra 1986.5-92- ALL on their website along with the solid spacer instead of crush washer and MFactory Mechanical LSD. Then it's just a matter of ordering a bunch of shims and taking your time to set the preload and backlash. I still have my stock pumpkin intact sitting in the garage. All in all it goes smoothly as long as you take your time. So to answer your question. Yes you can take the gears and/or lsd out of the is300 and also use it in our pumpkins. They are identical on the inside.

Awesome that is perfect

[Flateightysix]

One other thing I think would be interesting would be to see if you could swap diff covers on the is300 diff also. For example use the Cusco diff cover or the GReddy high capacity one and still make everything fit


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[fika84]

Originally Posted by Flateightysix

One other thing I think would be interesting would be to see if you could swap diff covers on the is300 diff also. For example use the Cusco diff cover or the GReddy high capacity one and still make everything fit


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You can, they're literally identical pumpkins. One day I'll drop $500 on the damn covers for more capacity and the option for a diff cooler.. the mechanical LSD can get quite hot.