You'll want to buy a new front u-joint since you'll likely be beating out the old one.Ģ) Clean up the yoke around the hole, making sure to also clean the inside with brake cleaner or lacquer thinner.ģ) Use something abrasive to roughen the dimple in the yoke for epoxy adhesion. You could also install a solid yoke, but you'd still have a yoke with a hole in it.ġ) Remove the driveshaft and separate the yoke. A family member far away is currently borrowing my welder, so I had to resort to epoxy. That is by far the easiest repair.īut if you, like myself, have a transmission that isn't equipped with the seal retainer, or you simply want to do away with the design altogether, you can either epoxy the hole or weld it up. If you have a transmission equipped with the seal retainer, remove the tail housing and replace the o-ring. And I'm the first owner to figure this out or have a serious problem with it? And if I park on an incline, I'll lose a couple ounces overnight. So fluid goes straight out the hole in the yoke, splattering all over the underside of the cab and bed, transmission, driveway, etc. But the TH350 I have doesn't have a seal retainer. In my case, the yoke appears to have been swapped at one point because the truck has a two-piece driveshaft, so the yoke barely moves in and out of the transmission (I'm talking about maybe 1/4") thanks to the two-piece design. ![]() You can imagine what happens with transmission swaps. If the output shaft-to-yoke o-ring is damaged/missing, transmission fluid has a straight shot back to the yoke and out the hole. (The logic of this design is up for debate since I've never seen nor heard of a transmission without this holey yoke design having pressure buildup issues due to driveshaft movement ). ![]() The design allows the yoke to slide into the transmission with suspension movement without building up pressure in the transmission. These transmissions came from the factory with a yoke that has a sheet metal plug pressed into the center with an approx. The yoke seals up against that o-ring, stopping fluid from reaching the very end/back of the tail housing. Apparently some TH350s (I'm not sure about 400s) have a seal retainer on the output shaft that accepts an o-ring.
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