rebuilding a 915 tranny

[john hejmanowsk]

I suffer from the dreaded 'while you are in there' syndrome.....

I am adding the WEVO gate shifter to my 915. So, while I am in there..... I thought I should fix a shifting problem.

The tranny has 71,000 miles on it, shifts fine except getting into 1st. The typical problem, hard to get into 1st if the car is rolling. Not a big objection, but one I would like to fix 'while I am in there'. What parts (bands, syncros, sliders, stops?) should I have on hand to change out. And again, I am thinking only of 1st (and 2nd if it's related), 3rd, 4th, and 5th shifting are just fine.

Also, am I nuts to mess with the 1st shifting? Should I just do the WEVO (I already have it)?

Thanks for any input.

John H

[glenndeweirdt]

You are a better man than I if you take on this project. Chain tensioner upgrade was as involved as I want to get in my garage.

I remember a year or two ago someone posted a hilarious story about the mishaps of a 915 tranny rebuild. It's probably out there somewhere. Good luck.

[jpnovak]

What are the symptoms of it not going into first?

Hard to get in gear? This would tell me that the slider/dog teeth are worn/mushroomed and do not want to engage each other. This could also be described as a balk towards going into gear.

Grinds before it gets into gear? This would tell me that the syncros are worn and the above is not far from happening.

When I rebuilt my 901 a few weeks ago I found all three major parts (sliders/dog teeth/syncros) were worn. I did not need to replace any brake bands or stops.

[drsimonwong]

My baulky 1st shift was corrected by just a Wevo coupler replacement and many hours of fine tuning with the adjustment.

Try this before you do anything else?

Simon