1985 Toyota 4Runner I found where my vibration is coming fr

Hi vanhca40, So it is the transfer case flange that has excessive side play. Behind the cover there is a bearing , one each for the front and rear flange. Removing the cover is easy but removing the bearing would be another story. Did you check if the propeller shaft U joints are good? I have seen cases of the flange nut getting loose and retightening it works. You would need to disconnect the propeller shaft to be able to check the flange nut torquing.

Yes you are correct, I definitely said transmission but it is the transfer case that I am talking about. I did check the U joints and they are good. There was a little play between mating of the sleeve yoke and the propeller shaft. I may replace that too, but I don't think that is my main problem, although it could have caused that bearing in the transfer case to wear sooner, of course if its just the bearing that is bad. I hope that is all it is. Do you think that bearing is press-fit? Thanks for the help, definitely helped diagnose my problem. I will also check to see how tight the flange nut is also once I start digging into things.

Craig

The bearings seldom wears out unless oil is lacking for extended periods, but tends to have excessive clearance due to the flange nut losing its torque. They are a close fit but not that tight to require bench pressing.

After removing the flange joints, retightening the nut would usually resolve the excessive clearance problem as the bearings are conical type and adjustable.

Bad U joints would cause vibrations and over time they would cause the flange nut to be loosened so that should be resolved before replacing the oil seal and retorquing.