Things I learned at a Dr. Evil Transmission Clinic, (McMarks Coffee Sucks) Options

[ConeDodger]

First of all, my transmission had just been rebuilt a year or so before and at that time had a billet intermediate plate and Guard Torque Biasing Differential installed at that time. Issues discovered during that rebuild were the bearing in the stock intermediate plate had a cracked race which I hear is common, and synchro replacement was needed in gears 1 through 3.
So, I was opening a fresh box and should expect to find fresh parts without wear. right?

My first gear synchro which again was new, showed pretty significant wear. My first gear dog teeth were pretty worn as well. The dog teeth wear would never have gotten by the guy who rebuilt it. He would have replaced it during the rebuild.

Lesson one: never downshift your 901 into 1st gear while you are moving. It seems that even though it has a syncho it will not tolerate that.

I changed to M 3rd and S 4th gears. I left the Zd 5th on the advice of the learned DNHunt who knows a bit about teeth in humans as well as transmissions.

Lesson two: this is a very nice gear set for street driving in traffic with lights and stop signs. I expected it to be a great autocross/DE transmission but what I didn't expect was to be able to cruise down Sunrise Blvd. in 4th gear without any urgency to downshift. In short, it isn't so "busy" in traffic.

Lesson three: with all due respect to the Capn who says transmission gear oil does not need to be changed, I have to agree with the Evil Dr. My fresh gear box had a little metal Chia Pet attached to the magnet after only a few thousand miles. The Dr. says change it after the first thousand miles. I agree.