So I'm looking into getting a supra TT auto differential for my sc400. Just wondering, what is involved in installing the supra auto diff? Is the whole pumpkin compatible? What needs to be changed if anything?

 

The Carrier is the only thing you will actually need.
If you can get an entire pumpkin you can bolt that in also.
The Supra TT 6-speed diff is larger, and will bolt in also, but you need the axle's, and to change the driveshaft. You might be able to change the 3 pronge flange on the front of the 6-speed housing, as it uses a larger flange, but they are interchangeable with what is on your can now, but I don't know if the nose is longer requiring a shorter driveshaft.

But for the TT auto Diff, you can bolt in the entire housing, and use your axles. (Might need to change the 3 prongle flange, but again they interchange.
You can also just get the Torsen carrier, and put it in your housing, but this will require some knowledge on setting up a rear end gear (Ring n Pinion)

I just broke my Supra TT Auto carrier in my SC400, They are strong units. I was putting a lot of abuse on it.
https://www.clublexus.com/forums/per...ferential.html

 

Thank you for the info!!
Sorry to hear your diff broke man. How much power were you putting out?

 

I was drag racing with it, and I was putting about 600hp, and 600ft-lbs to the back tires.
Trap speeds were in the low 130's with 133mph the cars best