Slip Yoke Plug Leaking

[funflyer]

In the middle of a TKX installation for the 66, I temp installed a new yoke so I could service the ATF and get the trans in the car. Today I went to pull the yoke, in preparation of having the driveshaft shortened next week, when I noticed a drop of fluid coming from the plug. I verified the leak using compressed air from the spline end. First time I've ever seen one leak. Is there a common fix for this? I figure the driveline shop could probably weld the plug in place or have another way of sealing it. They're closed till Tuesday.

 

[Lubener]

I'd replace the yoke. I would be concerned with the slim chance of causing a balance issue trying to fix it.

 

[funflyer]

Since the shop has to balance the shaft after they shorten it any fix shouldn't be an issue.

 

[2strokeNorthstar]

Ask the pros at the driveline shop. I’ve had to replace 2 from the plug getting pushed out and leaking on my F150. Due to off road abuse. I don’t know why it happens, bad design? It shouldn’t bottom out and pop the cap, it’s a stock driveshaft.

 

[flanso]

It is difficult for me to tell from the photo, but if the plug is convex with the dome pointed outward, it is a Welch plug. A Welch plug is seated by being struck on the dome which expands the plug's circumference.

 

[funflyer]

Took the driveshaft and new parts to the shop today. They welded the plug in place, shortened and balanced the driveshaft. They said they've welded more than a few yokes over the years without issue.

 

[clinebarger]

That seems to be a somewhat common issue...Even with new parts from reputable companies like Neapco, Spicer, & AAM. Some slip yoke bore plugs are epoxied in place....I make the mistake of trying to weld one up....What a mess as I didn't know about the epoxy 'til it was too late. I know now to heat it with the torch before attempting to weld it.

 

[clinebarger]

Ask the pros at the driveline shop. I’ve had to replace 2 from the plug getting pushed out and leaking on my F150. Due to off road abuse. I don’t know why it happens, bad design? It shouldn’t bottom out and pop the cap, it’s a stock driveshaft.

The Yoke is bottoming out on the Output Shaft & pushing the plug out. That's better than tearing up the T-case.

If the Bump Stops for the differential are good, The differential is still located on it's dowels, And the Powertrain wasn't slid back (Trans crossmember is slotted).....You may very well need a little shorter shaft, While it's rare to have this happen on a stock vehicle, It's not unheard of.

 

[2strokeNorthstar]

The Yoke is bottoming out on the Output Shaft & pushing the plug out. That's better than tearing up the T-case.

If the Bump Stops for the differential are good, The differential is still located on it's dowels, And the Powertrain wasn't slid back (Trans crossmember is slotted).....You may very well need a little shorter shaft, While it's rare to have this happen on a stock vehicle, It's not unheard of.

I put some extended bump stops on it. I don’t think anything slid back. The motor was swapped under warranty like 18 years ago. Maybe they messed something up then? The rear diff was also changed a while back but since then the truck has been on light/weekend duty and hasn’t had any trouble. I wouldn’t be surprised if it has the wrong driveshaft. I’ve had every single problem that “effects a small number” on this truck.