Transfer Case

[Z71sierra7787]

The rear main seal is leaking on my transfer case and i need to get it taken care of because im tired of wiping off the little drops on the garage floor, my question is is hard to do on my own and how to do it because im decently mechanical so i think i could handle it or if i should just take it somewhere, people have always just told me it depends on if its a slip yoke or not but i dont know, but its a 99 Z71 with an Autotrac tranfer case, any help would be great, thanks

[SCIV]

I wish I knew. Someone will chime in.

[Bowtie70SS]

Ding....It's not terribly hard to replace the rear or output shaft seal. You need to check the bushing in the tailshaft as well. You can check this by grabbing the slip yoke and rocking it side to side and up and down. If there is a lot of play then the bushing is worn out and no matter how many seals you put in it will still leak. I use a seal remover to take out the seal (A screwdriver will work) and to replace it you can rent-a-tool a seal and bushing driver set or if you have a suitable old bearing race or piece of pipe tap the new seal in. You can also just start the seal and tap it in with a hammer if you are careful. If you do need the bushing you may be able to get the old one out with a hacksaw blade (by slicing a slit in it) otherwise you will have to remove the transfer case. To put the bushing back in you will need a bushing driver. Hope I've helped a little.

Dave

[hummertech]

part #16, its a little rubber plug on top, please check that for oil arround it. if its oily, clean it good, remove it by pulling on it, clean and reinstall it with silicone sealer, ive seen a lot of them leak and look like a rear seal leak. also please fill the transfer case with Auto-Trac® ll Fluid, GM P/N 12378508. its made just for that transfer case. and takes 2 qts for a complete fill. (its bright blue just to let you know)

[Z71sierra7787]

Awesome you may be right but i have to check because when i was under looking at it it looked like there was fluid further up on the case so that might just be it i hope, but i not the front axle looks to be leaking very slightly around the seal, difficulty on that or any other little things that could be the cause? Thanks for the help