A few weeks back I came across the opportunity to buy a new, complete and assembled Ultima SC Diff for a good price. I bought it and today I modded my car for a gear diff.
The job took about an hour - the other rebuilding and cleaning work I did not included
(that took me the whole day) - and the instructions above are detailed enough to get the job done.
There are only two things I'd like to add to the post Junior Z made:
First of all, after shaving the material the bearing has to extend slightly further into the casing than the ribs (aka the recess than holds the bearing needs less shaving than the ribs). If you don't do this the diff will rub slightly on the casing, even if the bearings are far enough apart (I think it has something to do with the screws that close the diff).
Also, take things slowly, it's best to shave off, test fit everything and repeat the cycle until you have enough clearance rather than overdoing it.
The diff feels very nice and smooth, it's very unusual to feel this on my TRF201! The first test will be on the 28th of July on astroturf, as a practice session for the nationals race one day later. I'm very curious about how it will drive, stay tuned!
