QUOTE(bobhasissues @ Dec 23 2010, 09:01 AM)
QUOTE(r_towle @ Dec 22 2010, 10:31 PM)
What type of gear oil have you been using?
Rich
Swepco 201
I personally stay away from any synthetic gear oil because the brake bands were not designed for it, and I have been told that it can actually wear them out faster.
Swepco (not sure if its synthetic or not) may be fine, but its just a word of caution.
It is specififed for the later transmissions, but we are not using those transmissions...so not everything that works for the 911 is right for our cars.
One thing that may be your issue, aside from the brake bands wearing, it the bearings at the intermediate plate move, and the case bore for the bearing do get ovaled out over time.
In several of the cases I have , the inner bearing seat is to far out of spec to re-use the case. It may be rare to have this happen, but I have two...so its not super rare.
Hard to feel, easy to measure.
These were on race trannies so they have experienced a tough life...
I also found that the position of the shift fork makes the number 2 gear either work perfectly...or work as you you are experiencing.
I have an old case that I use with a large cutout to mount the gear stack so I can position the forks correctly.
Even with all the specs, I have had to fiddle with that number 2 fork to get it to shift fast and easy into the number 2 slot.
Its just a hair in either direction...
Shoot for a neutral position and I even favor the number 2 side to ensure that the number 2 gear is up to speed.
If you somehow adjusted the shift fork so the brake band is always rubbing (BTDT) then it will wear out pretty fast...and that may be your issue.
If it was me, I would pull the gear stack again...take a magnifying glass and look at the brake band all the way around...look for a wear pattern.
Feel it on the number 2 side of the band (it has a crown..each side serves one gear)
Inspect the current position of the brake band while the tranny is in neutral and spin both gears on either side by hand...
This will let you FEEL the resistance ...
If its rubbing (I am talking about 1/32 of an inch here) you need to move it.
Your total adjustment is about 1/4 of an inch front to back...so its not to much.
It may have just been aligned incorrectly and needs to be replaced and adjusted again...it happens.
Oh, inspect the magnetic drain plug....
If on a recently rebuilt tranny you find a build up of metal on that plug....look more closely at the gear stack and find out why.
I also stick with simple 70/90 weight DINO gear oil.
Rich