Slip Yoke Weeping AT Fuild

willyr1er · April 10, 2018

So I have a new problem that started about a week ago. The transmission slip yoke is leaking from the small hole at the U-joint. The rear seal is bone dry so I know that's good and not the issue. From what I can find online, I have a bad O-ring in the tail shaft.

Anyone else ever has this issue and if so what was the corrective action?

My truck is also has 5" lift blocks in the back, not sure if maybe I don't have enough engagement for the slip yoke? whats the best way to measure?

Nasty · April 10, 2018

How much of the input shaft is sticking out?

willyr1er · April 11, 2018

I'm measuring about 2.75" from the cover. Photo attached

Is this too much?

Nasty · April 11, 2018

I wouldn't want mine like that but I've seen worse

willyr1er · April 11, 2018

That's good to hear. Any idea how long the yoke is with out pulling the driveshaft?

For now I just plugged the hole in the middle where it was leaking with some RTV, I dont know how this will effect the transmission but for now it has stopped the leak. I found a few sites where other have done the same, some people said not to because it is a vent hole.

Hope the RTV keeps working until I can start to pull it apart looking for a bad O-ring.

Nasty · April 11, 2018

I think 6 " or so

willyr1er · April 17, 2018

So far the RTV in the hole has held up and no leaks since. Ive put on a good 500 miles on it. I'll just ride it out until it starts up again.

00pooterSS · April 20, 2018

I've replaced a few GM trans yokes for leaking. We just order a new one from GM and put them on is how we fix them.

I'd use yours with the RTV for as long as it holds.

Edited April 20, 2018 by 00pooterSS

willyr1er · April 25, 2018

Good to hear, thanks!

I keep looking on my driveway every day for the leak to start again.

King chuy · December 5, 2018

I’m having the same issue I lifted my truck 6.5 and I thought it was leaking from the seal but it leaking towards the end here is a picture.

I need help I don’t know what is the correct way to fix this.

300 Blackout · December 6, 2018

I’m having the same issue I lifted my truck 6.5 and I thought it was leaking from the seal but it leaking towards the end here is a picture.
I need help I don’t know what is the correct way to fix this.

You need a new driveshaft made to the correct length to accommodate your lift. The picture of your slip yoke shows a very dangerous condition that needs to be corrected.

I had one made to the correct length and this is how much of my slip yoke is exposed with all four wheels on the ground.

Allen Ash · December 31, 2019

How hard is it to replace the slip yoke? I have a 2016 GMC Yukon XL that just started leaking when parked on an incline where the rear of vehicle is lower (it doesn't leak when on level ground.) The dealer quoted me almost $500 to replace it which seems like a total rip off! They also recommended replacing the front joint as well. Any advice would be greatly appreciated!

swathdiver · December 31, 2019

2 hours ago, Allen Ash said:

How hard is it to replace the slip yoke? I have a 2016 GMC Yukon XL that just started leaking when parked on an incline where the rear of vehicle is lower (it doesn't leak when on level ground.) The dealer quoted me almost $500 to replace it which seems like a total rip off! They also recommended replacing the front joint as well. Any advice would be greatly appreciated!

Slip yokes don't leak. The slip yoke oil seal might. 3/4 of an hour labor rate for mine which should be the same as yours.

davester · December 31, 2019

56 minutes ago, swathdiver said:

Slip yokes don't leak. The slip yoke oil seal might. 3/4 of an hour labor rate for mine which should be the same as yours.

While I don't know specifically about the yoke installed on the O.P.s truck, some slip yokes do leak. At least some of them are machined with a through-hole, and with those ones, the plug used in the hole can leak.