i have a 99 ls blazer 4.3 and the rear trans seal is well is shot and i really couldnt find any good walk thrus or how tos on the site i need to do this asap

 

Generally, the rear transmission seal can be pried out of its housing after removing the driveshaft. A little tape is handy to keep the caps of the rear U-joint from falling off and all the needle bearings falling out. You might want to park the vehicle "nose down" to minimize the amount of automatic transmission fluid that will run out when the driveshaft is removed. The new seal will tap back in and I prefer using a rubber mallet and a large socket that matches the seal O.D.for such work.

 

thanks im going to do this asap cuz right now it gose in the top i drive down the road it comes out and slings on to the exhaust

 

Is this a 2 or 4 wheel drive?
If 4, then the transfer case will have to come out or down before you can get to the transmission seal. (At least that is what I was told)

 

There is no rear transmission seal if it's a 4wd, only the transfer case input seal.

The process kevlar posted will work regardless of 2wd or 4wd for replacement of the rear driveshaft output seal. But before you replace the seal, check for play in the sleeve bushing inside the output housing. If there is play, check the slip yoke for wear. If there is play & the slip yoke shows wear, you will need a new bushing & a new slip yoke.

 

yeah its 4wd i need to go check that tomorrow i was in the sun all day its ac time
and i was going of that it was a rear trans seal cuz thats what my trans shop told me but they didnt look at it they said they change them alot on blazers

 

If they said they change a lot of them, they're blowing smoke up your #$$. As I said already, there isn't a seal at the back of the transmission. What is your truck doing??