6-speed Slip yoke plug leak?
Team Owner
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Do you know that it's a correct GM/OE ZF slip-yoke? A TH400 ain't the same. Why do the 'splines seep'?
GM# 12345879 is the original product. It was expensive! If you know a GM Service Tech who does drive-line he likely has a can on his bench. You don't need but a couple of 'swipes' of the stuff.
Others have done differently! I've a friend who might just use the GM Lubricant if it was in other than a C4.
Last edited by WVZR-1; Jun 2, 2021 at 12:37 PM.
Thread Starter
Safety Car
Joined: Aug 1999
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From: Texas
It's the original tranny/yoke, with 34k miles. Most of the leaky oil evidence on the tunnel appears a couple of inches behind the tailshaft seal, so I'm assuming it's the yoke plug. The tailshaft bushing is well within spec at 006", and the seal surface on the yoke looks good.
Last edited by RatRacer; Jun 2, 2021 at 01:38 PM.
Team Owner
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Drive shaft is now out of the car?
Here's what some have done!!
https://www.corvetteforum.com/forums...slip-yoke.html
Here's what some have done!!
https://www.corvetteforum.com/forums...slip-yoke.html
Last edited by WVZR-1; Jun 2, 2021 at 01:48 PM.
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,862
Likes: 118
From: Texas
Yeah, I'm swapping the original rear end with a new one with 4.30 gears. Discovered an oily mess at the tailshaft when removing the c-beam. Car didn't drip on the garage floor, so it must be a very small leak, but the c-beam and yoke were soaked with oil.
Team Owner
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I was quite careful NOT to say IT WILL!! I mentioned a plug and when reinstalling use the Synthetic product!! I told you what I suspect a friend would do if it weren't a C4!
Out of the car, stand vertical and just fill with oil or ATF or whatever! Slip-yoke will either leak OR NOT!!
There's enough info out there on the WWW... so you can do your own research! I won't toss an 'opinion piece' at you!!!
Out of the car, stand vertical and just fill with oil or ATF or whatever! Slip-yoke will either leak OR NOT!!
There's enough info out there on the WWW... so you can do your own research! I won't toss an 'opinion piece' at you!!!
Last edited by WVZR-1; Jun 2, 2021 at 02:21 PM.
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Team Owner
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So NOW you're in a 'HURRY'?? It's maybe 1:30 out there, you should be back home by 5:00!!
If I were in a hurry I might stuff a Viton O-Ring into the slip-yoke after a clean with thinner or Acetone, some epoxy? Assemble with GM Synthetic!
*** Reply to post #10. It's only Wednesday!!
Last edited by WVZR-1; Jun 2, 2021 at 02:32 PM.
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,862
Likes: 118
From: Texas
Thread Starter
Safety Car
Joined: Aug 1999
Posts: 4,862
Likes: 118
From: Texas