901 trans "sings"

[zeked]

I have a 67 with a 901 5 speed. When I decelerate the trans sings or howls. Takes about 15 miles or so to start. If the clutch is in...in gear or neutral no noise. if the selector is in neutral and the clutch is out ...no noise. Speed makes no difference except that heavy decell makes more noise. If I lift off of the gas it will howl in any gear.

Opinions?


TIA
Zeke

[Grady Clay]

Zeke,
Welcome to Pelican
You will find a lot of help here.

The ‘singing’ is probably not a good song.
Typically, this can be a worn pinion gear.
The ring and pinion (R&P) gear-pair is very expensive new – but available.
Replacing it (even with a used one) is not usually a DIY procedure due to the special tools and experience necessary.

You might source a ‘known good’ used transmission from a Pelican. There are some available.
You will usually find ones with worn shifting pieces (syncros, etc.) Repairing this can be DIY.
You might want to get several transmissions and rebuild yours with ‘all the best parts’.
There are quite a number of subtle changes among these 901/911 years so consult here.


Tell us more about your 911 (flattering pictures necessary).
If your chassis-engine-transmission are as original, it is useful to retain your original (number) transmission casting.

Again, WELCOME.

Best,
Grady

[daniel911T]

Zeke,
I have a '69 with a transmission that both sings and grinds. It's not a very happy unit.

I just bought what I hope is a "known good" used 901 5sp from tom1234racing for $400+ shipping. It's a massive understatement to say that this route is less expensive than a rebuild. I think the cost of the used unit times two might do just the R&P work that both of our transmissions need. SHAMELESS PLUG: I've bought some other stuff from tom, he seems to have a very large selection of parts, especially early parts, and I've always felt he's given me a good deal.

If you have lots of money, then get it done right and have the piece of mind. I have a very time consuming job, 2 cats, 2 other cars, a pregnant wife, a 3yo daughter, and I live in one of the most expensive places in the country. Resources, both money and time are scarce. I try to spend Porsche money in amounts roughly equal to how much I drive it. (once a week or so) I do all my own wrenching, and my time is extremely valuable too, so time to change a tranny is much lower than rebuilding.

With the amount I drive, I suspect this used transmission will get me around until I actually have the time and money to leap off the top of the slippery slope.

Good Luck!
-Dan

[ppanagis@gmail.]

Throw out bearing also just a thought... Take it apart before ording any parts.

[RWebb]

as the old folk singer, Steeley Guthrie once wrote:

"It takes a worn transmission, to sing a worried song...

It's worried now, but it won't be worried long."

mainly, b/c it will eventually blow up.

[zeked]

I have a 71 (clutch arm on wrong side) what would be the chances that the R&P would interchange????? 71-67 what could go wrong?