![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
|
Can a transmission leak through the yoke and U-joints?
I have what appears to be a "two drip a day" transmission leak. It is coming out of the U-joint at the back of the trans.
The trans and the trans seal are dry. I thought perhaps it was just grease I packed into it during assembly coming out (red grease, red trans fluid, hard to say). But it's been doing it for a couple of weeks now and I don't think there's enough supply in a U-joint cap to account for it. I switched over to the big (1330 or 1350?) yoke, as it is a 200-4R and wanted to retain my driveshaft. If not through the yoke, is there anywhere else I can check?
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,621
|
Re: Can a transmission leak through the yoke and U-joints?
Some yokes have a vent or weep hole in them. Dead centre.
|
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Jan 2012
Location: Henderson,TX
Posts: 336
|
Re: Can a transmission leak through the yoke and U-joints?
they will tend to leak if the truck sits for a long amount of time. trans fluid slowly works its way out of the converter and then it will leak through the yoke. my truck will do it if it sits for more than a couple of weeks.
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
|
Re: Can a transmission leak through the yoke and U-joints?
What geezer said. Truck yokes have a weep hole. The transmission would have a seal sleeve inside to keep fluid from wicking down the splines and leaking out the hole.
I'm pretty sure their were never any seal/sleeves for the 200-4r so go ahead and weld up the hole in the yoke.
__________________
My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
![]() |
![]() |
![]() |
#5 |
Registered User
![]() Join Date: Apr 2007
Location: Foster Rhode Island
Posts: 1,176
|
Re: Can a transmission leak through the yoke and U-joints?
hhmmm, I'm no expert but I think that hole is there so air can vent in and out as the yoke travels in and out as the truck goes up and down. Id research it a bit deeper before I'd weld up the hole. Better to weld it later than try and drill it out again.
|
![]() |
![]() |
![]() |
#6 | |
Registered User
Join Date: Jun 2014
Location: Glendale, Arizna
Posts: 1,642
|
Re: Can a transmission leak through the yoke and U-joints?
Quote:
I'd clean it as good as possible and silver solder it like a water pipe. Never tried that before, I just now made it up so can't say I've done it but I have silver soldered many, many high pressure diesel injection lines (up to 2800 lbs psi) and that stuff is quite dependable just make sure you flux it good first. You might get it mig or tig welded as well. Otherwise, replace the yoke. |
|
![]() |
![]() |
![]() |
#7 | |
Registered User
Join Date: Jun 2014
Location: Glendale, Arizna
Posts: 1,642
|
Re: Can a transmission leak through the yoke and U-joints?
Quote:
If the yoke is out of the donor vehicle's 200R4, it will not have a weep hole, it will have one spine missing to perform that vent function. Dave, make sure you have an open area in the splines on the yoke or the shaft, I think it's on the yoke but can't remember 100%. |
|
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Jan 2014
Location: Sacramento,California
Posts: 696
|
Re: Can a transmission leak through the yoke and U-joints?
I think I would try something simple first like a rubber plug or something that way if it blows out of there quickly, you know it needs to be vented.
Im not a transmission guru, Is the transmission vented elsewhere, perhaps that ven is restricted and pushing some fluid into the splines.
__________________
Built not bought! My dad always tried to convince me HEI was pointless! Welding is a lot like sex, you don't have to be great with the rod as long as you thoroughly prep the surface and your good at grinding ![]() My build : 68 C10 Short Bed Conversion |
![]() |
![]() |
![]() |
#9 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
|
Re: Can a transmission leak through the yoke and U-joints?
We usually used plastic weld to seal the plug and the hole too. If you haven't had the driveshaft ballanced a vibration can cause a leak.
__________________
67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
![]() |
![]() |
![]() |
#10 | |
Registered User
Join Date: Jun 2014
Location: Glendale, Arizna
Posts: 1,642
|
Re: Can a transmission leak through the yoke and U-joints?
Quote:
Maybe not a transmission guru, but a pretty smart feller! not a good speller! ![]() LOL |
|
![]() |
![]() |
![]() |
#11 | |
Registered User
Join Date: Jan 2014
Location: Sacramento,California
Posts: 696
|
Re: Can a transmission leak through the yoke and U-joints?
Quote:
![]()
__________________
Built not bought! My dad always tried to convince me HEI was pointless! Welding is a lot like sex, you don't have to be great with the rod as long as you thoroughly prep the surface and your good at grinding ![]() My build : 68 C10 Short Bed Conversion |
|
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|