Turbo 400 Yoke Weep hole drip???
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Olds Specialist LOL
Joined: Jun 2012
Posts: 2,220
From: TUCSON
Cleaned up u bolts
Painted some balancing stripes, yup made my Own colors
Primed a few spots
New universal
Last edited by JOHNNYOLDS442; Sep 23, 2020 at 08:53 PM.
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Joined: Jan 2010
Posts: 6,104
From: central Indiana
Yokes without a bleed hole usually have one missing spline so the yoke can “breath” as it slides over the output shaft. Or they may use a sleeve with a internal o-ring that goes over the outside of the yoke. I have never seen one used on a 400.
Th400 with a bolt on yoke use a yoke with a counter bore internally that slips over a o-ring on the output shaft. I can clearly see no threads in the center of the output shaft, so obviously no one has mixed up parts during an overhaul.
Do the internal splines on the yoke extend all the way to the end of the yoke?
To make a long story short, your probably going to be fighting leaks again by plugging up the weep hole. Either you have something worn out allowing excessive fluid around the yoke, or you have some mismatched parts. If there is a weep hole, then there needs to be some other method of preventing fluid from getting past the splines. And if there is no weep hole, then there needs to be another way to allow the yoke to vent as it slides over the output shaft.
Th400 with a bolt on yoke use a yoke with a counter bore internally that slips over a o-ring on the output shaft. I can clearly see no threads in the center of the output shaft, so obviously no one has mixed up parts during an overhaul.
Do the internal splines on the yoke extend all the way to the end of the yoke?
To make a long story short, your probably going to be fighting leaks again by plugging up the weep hole. Either you have something worn out allowing excessive fluid around the yoke, or you have some mismatched parts. If there is a weep hole, then there needs to be some other method of preventing fluid from getting past the splines. And if there is no weep hole, then there needs to be another way to allow the yoke to vent as it slides over the output shaft.
Thread Starter
Olds Specialist LOL
Joined: Jun 2012
Posts: 2,220
From: TUCSON
Yokes without a bleed hole usually have one missing spline so the yoke can “breath” as it slides over the output shaft. Or they may use a sleeve with a internal o-ring that goes over the outside of the yoke. I have never seen one used on a 400.
Th400 with a bolt on yoke use a yoke with a counter bore internally that slips over a o-ring on the output shaft. I can clearly see no threads in the center of the output shaft, so obviously no one has mixed up parts during an overhaul.
Do the internal splines on the yoke extend all the way to the end of the yoke?
To make a long story short, your probably going to be fighting leaks again by plugging up the weep hole. Either you have something worn out allowing excessive fluid around the yoke, or you have some mismatched parts. If there is a weep hole, then there needs to be some other method of preventing fluid from getting past the splines. And if there is no weep hole, then there needs to be another way to allow the yoke to vent as it slides over the output shaft.
Th400 with a bolt on yoke use a yoke with a counter bore internally that slips over a o-ring on the output shaft. I can clearly see no threads in the center of the output shaft, so obviously no one has mixed up parts during an overhaul.
Do the internal splines on the yoke extend all the way to the end of the yoke?
To make a long story short, your probably going to be fighting leaks again by plugging up the weep hole. Either you have something worn out allowing excessive fluid around the yoke, or you have some mismatched parts. If there is a weep hole, then there needs to be some other method of preventing fluid from getting past the splines. And if there is no weep hole, then there needs to be another way to allow the yoke to vent as it slides over the output shaft.
Thanks, I would say it’s going to vent from the other Worn out part back in the trans.
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Joined: Aug 2010
Posts: 990
From: Economy, Nova Scotia
I had this same issue on my 71 SX with the TH400. It wasn't until I replaced the 77 Pontiac TH400 that a transmission shop had put in by a prior owner that I discovered the reason. It was leaking transmission fluid every time I parked it nose up. When I rebuilt the correct 71 Cutlass transmission I obtained, I noticed an O ring on the output shaft. This O ring is designed to stop the fluid from running along the output shaft splines exiting at the weep hole. If you have a yoke with a weep hole you need the Oring. Problem solved. Do you have a combination of parts of perhaps the Oring is damaged or dried up. Worth a look.
Thread Starter
Olds Specialist LOL
Joined: Jun 2012
Posts: 2,220
From: TUCSON
I read countless Threads on different car forums If the O ring is bad you can patch the hole with no ill affects or you can slip a new Oring over the shaft.
Since i already did i will leave it for now thanks for the reply's.
Since i already did i will leave it for now thanks for the reply's.
Registered User
Joined: Dec 2012
Posts: 548
From: elkhart indiana
My long tail 400 has the yoke with a vent hole, the splines don't extend all the way to end of the yoke and the output shaft has an oring.
I have never seen one with a vent used on a short tail 400.
I have never seen one with a vent used on a short tail 400.
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