3rd gear whine, 3rd is now spooling up.... Options

[stock93]

I got to drive my car around for the first time today. I have a really loud whine from the transmission when in 3rd gear and under power. As soon as I let off power it stops whinning. It only does it in 3rd gear. What do you guys thing this would be? bearing? syncro? I'm definately not a transmission guy. I guess this would be a good time to switch to side shifter?

John

[John]

Acox914

a little OT, but here goes.... i am comfortable working on anything on my car BUT the transaxle. it scares the bejeezus out of me. i need to be cured  

If you dont want to screw up yours, but want to overcome the fear, buy a boneyard trans or one off e-gay for $50-$100. Take it apart, re-assemble, take apart, etc. They aren't that difficult. If you have done an engine, you shouldn't have a problem with a trans. The main thing is to keep everything clean and keep track of the thickness of the gaskets (shims) as you remove them.

Follow the steps in the workshop manual.

Keep everything very clean and use quality lubricant.

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Brad,

I have seen 3 pinion bearing races loose in the 901 case cause the same symptoms. Right now we dont have a fix for it... you can buy new cases from Porsche however. I dont like the trend I'm seeing.. it is not good for us. The 915's already have a fix available. Hopefully we come up with something soon.

Is that the race up in the main case? Isn't that a smooth bore and a roller bearing?

Go to a quality Bearing house and talk to them about a slightly larger OD race. They should be able to match up the bearing with a larger OD race. (You should also have them price the roller bearing) The bearing supply house should be able to redily supply all the trans bearings except for the special flanged intermediate plate bearings. I had a cross-reference someplace on the 901 boxes...

You could also take the case to a quality machine shop and have them either rebore that and cut a new snap-ring groove or something.

Is this "trend" with higher output motors, or is it even with the stock 4-cyl cars?