Transmission exam

NoEardGoat · 10-11-2007, 10:58 AM

I got my 911sc with a broken motor and have never driven the car. The motor is being replaced, but transmission was replaced just prior to the engine failure.

I was wondering is there anyway to check the condition of my transmission before I install it back into the car with a good engine?

I could pull the case apart and inspect? Is this the only way? How much of a hassle is this? Parts required?

aftermath · aftermath's Garage

I asked the same question a while back. Your looking at hundreds of dollars to have a shop do it. I think someone said $600. If you search my threads you might see some info to help. I wouldnt know what I was looking for if I took it apart myself. You will want to look closley at the clutch though.

Mo_Gearhead · 10-11-2007, 12:10 PM

Rather than tear into it ($$) .. gamble and put it back when engine is done. Could be fine.

Roll the dice??

Zeke · 10-11-2007, 12:58 PM

Generally speaking, you can do some static exam on the unit. You can turn it with an old clutch disc and shift. You can check for play and you can open up the side and check for fork alignment. What you can't do is hear any whine or probably see how the synchros have worn along with the related parts. But, if the oil is clean, the plug hasn't attracted a bunch of junk and the visuals all check out, I'd go along with mo_gear.

Early_S_Man · 10-11-2007, 01:01 PM

A couple of things can be checked with the transaxle out of the car.

Get a T-handle for the shift rod out of the nosecone, and check how easily it can be shifted into and out of all six gears. It will tend to be 'notchy' without the leverage of the shifter working for you, but there shouldn't be any resistance differences between the different gears.

Remove the trapezoidal shift guide plate [plan on replacing the paper gasket] ... after draining the gear oil. You can check for loose M6 nuts or studs holding the guide fork. Clean thoroughly and degrease, then apply Red Loctite on the stud threads into the cover plate, and Blue Loctite on the threads for the nuts holding on the guide fork. You can see a couple of the sychro rings, and whether the moly coating is worn [it shouldn't be on a fresh rebuild] ... and the general cleanliness inside.