Let me try to condense all the posts on this 81 spur thing.
The AE drive pins protrude a bit from the outdrives. When we went to the 4-Gear we wanted to keep the motor as far back as possible, and we made a slight mistake.
All is well when the car is on its wheels, but as Dan says, when the car is upside down, the protruding pins just touch the 81-T spur.
So take a Dremel to the two outer ends of the pins on the bones and get them to be flush with the outdrive. Just takes a second to remove a few thousandths. It has no effect on driving the car or on wear, but now the spur is OK.
We suggest everybody do this, then there are no issues changing spurs in a hurry at the track. Just a simple matter of car prep...
And, yes, changing the tranny case to eliminate this is a big deal, costing major money.
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