1993 GMC Sierra 2WD Truck Output Seal Leak - Looking for the service procedure to replace the transmission output shaft seal (which is leaking) and the transmission output shaft bushing (recommended when changing seal). The engine RPO is LB4 and the trans is M30. Can anyone point me toward an illustrated procedure as I am a fair backyard mechanic and would like to tackle this job myself...Thanks Carl

SOURCE: what transmission will fit in an 89 gmc sierra?

if it has a 4.3 liter motor a 86 to a 97 if it has a 350 motor a 81 to a 96 will work hope this helps

SOURCE: Rear axle seal leaking on 1997 GMC Yukon 4x4

You are Talking about the Main Cover on the Rear of the Rear end Correct???? If so, This is Just a Gasket and is Very easy to replace. The Gasket is Simply Worn out.

SOURCE: 1989 gmc sierra c1500 with 350 automatic 8 ft bed regular cab vibration at 45 in overdrive

I had the exactly the same problem, in overdrive my truck would start to shake, in 3rd it would instantly go away, i assumed it was the flywheel to, THIS IS NOT THE PROBLEM, your tranny is in good shape and flywheel are in good shape, I had the "Idle Motor" replaced is what my mechanic called it, this completely fixed my problem, also my fuel milage went up considerably after having this replaced, hopefully this will help you out

SOURCE: replace intermediate drive shaft in a 2003 GMC Sierra

we never did that. just battery disconect is sufficient. you can see the bolt to remove near the floor board pretty clearly as well as the one under the hood near the fire wall. You may have to turn the wheel alittle one way or the other to access both cleanly. The most important part of the job is this: dont let the steering wheel turn until you get the new shaft on. Why? there is a calibrated "air bag coil" in the steering wheel and if you let the wheel turn 360 degrees either way and then hook uo the steering shaft--the first time you make a full lock to lock turn it will snap the coil.

SOURCE: i'm replacing my transmission in my 1991 gmc full

If my memory serves me right, I'm pretty sure the only way to change the tail shaft is to tear the transmission apart. Depending on how much extra length you have you might be able to rig up some kind of spacer, but keep in mind that it will be supporting a lot of weight. You are probably better off finding the right transmission and re selling the one you have.