What causes a GM transmission yoke to leak?
Some GM transmission yokes, primarily those used on trucks, have a weep hole that relieves pressure buildup caused by the yoke moving back an forth as the vehicle passes over bumps and other road irregularities. If the trans in your truck leaks fluid when the vehicle is parked uphill, fluid may be coming out of the weep hole
What to do if your driveshaft yoke is leaking?
This will let the driveshaft yoke go all the way in without it hitting the end of the cup. The rest is the reverse of removal. To help from ruining another O-ring, use a little tranny fluid on the outside of the yoke before sliding it back into the transmission. This will also help save the rear seal from damage.
Can a crack in a transmission seal cause a leak?
If the needle bearings get damaged or there is a crack in the torque body, then you can have leaks, too. Again, this is a problem that transmission seal leak products cannot address. Replacement will. Transmission fluid leaks can also be due to cracks in the fluid lines.
What causes a leak in a transmission shaft?
However, over time, these seals will crack and get worn out, especially when being exposed to heat often. If you get a transmission leak from this, there are many areas of the transmission to check. Most commonly, you’ll find the leaky seal in either the input shaft or output shaft.
Some GM transmission yokes, primarily those used on trucks, have a weep hole that relieves pressure buildup caused by the yoke moving back an forth as the vehicle passes over bumps and other road irregularities. If the trans in your truck leaks fluid when the vehicle is parked uphill, fluid may be coming out of the weep hole
Where is the leak in the transmission shaft?
Photo # 1 shows the yoke plug. Our inspection discovered the plug that seals the end of the yoke had a small rust hole from the inside out. As the fluid traveled down the output shaft and yoke splines it leaked through the holes in this plug.
This will let the driveshaft yoke go all the way in without it hitting the end of the cup. The rest is the reverse of removal. To help from ruining another O-ring, use a little tranny fluid on the outside of the yoke before sliding it back into the transmission. This will also help save the rear seal from damage.
Is the shift shaft seal on a TH400 leaking?
TH400 and TH350 GM Automatic transmissions are notorious for leaking. My transmission in Ol’ Blue leaked like the Exxon Valdez for 3 years before I finally ran across the information online on how to replace the shift shaft seal myself.