I have changed the output seal in the bearing carrier,and it`s still leaking. I have stripped it down,cleaned it, ensured the oil thrower is seated correctly,cleaned it all and fitted new seal to a recon driveshaft. It still leaked, so stripped again, fitted new bearing carrier, another new seal and a shim. Still leaks. Does the fact I am running Dextron 6 which I believe is thinner have a bearing on this?
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There is a seal on the input and output shaft and a seal on the top cover . A slow leak will have road dirt collecting on the leaking area. An input shaft leak will in time foul the clutch disk. An output seal will cause the drive shaft to be wet where it connects to the transmission.
Sounds like a bad seal from pinion gear output shaft. ( if rear wheel drive ). To repair, take drive shaft off by removing the 2 u-bolts at the rear of shaft. A screwdriver is handy 2 pry shaft forward enough 2 remove shaft. This is the tricky part, the 2 bearing caps on u- joint r gonna want 2 fall out! Have a length of tape handy & run tape around the caps so u dont loose dozens of lil needle bearings. Also, ur gonna loose oil outta the rear of trans so use a pan 2 catch drippings. Next u have 2 remove nut holding rear yoke, where u-bolts were, find appro puller, remove yoke. Seal now should b avalible 4 rmoval.use seal puller, le. screwdriver&bfh, install new seal & rest is reverse order. Dont loose ur bearings,the're hard 2 find in the dirt! I kno 1st hand.
Depending on where the leaks are comming from determins the course of action that nees to be taken. If the leak is on the rear output shaft for the drive shaft, the seal can be replaced by removing the shaft and pulling out the seal. This is a relativly simple repair. If the leak is between the motor and transmission, it would be the torque converter seal and this requires the removal of the transission. If it is leaking from the side of the transmission, the transmission needs to be removed and taken apart by a professional. Check your transmission cooler lines. These can seep and the oil will run down the outside of the tube to a low spot and drip far away from the source.
I see that the solution given is for an axle shaft and not the drive shaft that was asked about. I am 99% sure that if you take out the bolts the other end will slide out of the t-case. Then the u-joint can be replaced as normally done.
The beaings job is to not only give the axle something to rotate on, but also the keep the axle centered in the hole. When the bearing gets loose, it allows the axle shaft to have an oblong roation, which wears on the seal and allows it to leak. You don't have to run the trans low on fluid to have the output bearings go bad. If you have gone enough miles to wear out a clutch, you have gone enough miles to get some play in the bearings.
If you did not damage it during install, you may have a bad output bearing which is allowing shaft to move up & down, check shaft to see if it moves. Generally unless there is a pronounced groove in the yoke seal surface it will not leak. (I generally put a small amount of rtv black on outside of seal to prevent any seepage around outside.
Clean the area off with a degreaser and watch it. If it is an input or output seal leaking, you unbolt the drive shaft going into the case, remove the nut that holds the u-joint flange on, pry the old seal out and tap the new seal in (be careful not to tap too hard or the seal will bend)
90 percent of the time stop leak does not work. Usually the seal between the transmission and transfercase goes out and forces all the fluid into the transfercase and leaks out the rear seal. Or the tranfercase or transmission breather could be plugged.