Rear Main Seal replacement, Best Way?

[mrnapolean1]

Hows the best way to replace the Rear main seal on my 350 TBI Motor without having to drop the Oil pan?

Truck Information:
Year: 1992
Make: GMC
Model: Sierra C1500 (Extended Cab)
Trim level: Sierra (Auto windows, auto locks, A/C, etc)
Tire condition: Fair
Tire size: 31x10.5/R15
Engine: 350 5.7 V8
Transmission: 700 R4
4WD?: No

 

[kennythewelder]

The rear main seal is a 1 peace seal. You have to drop the transmission to replace the seal, not the oil pan like the old V-8s were. When you go to the parts store and get one you will see what I am talking about. It looks like any other seal, EG brake rotor seal, transmission rear seal, ECT.

 

[DRAGGIN95]

Word, the trans has to at least be slid back enough to get to the seal, you will also need to remove the flexplate or flywheel depending on what trans you have.

 

[mrnapolean1]

I am fixing to replace the transmission (OD is not working on this one) so, I figure while the transmission is out I can replace the rear main seal.

 

[mrnapolean1]

Title misspelling Issue fixed!

I am still however having problems with the transmission.

 

[DRAGGIN95]

Title fixed.

 

[mrnapolean1]

Thanks! How do I fix If I make this mistake again?

 

[DRAGGIN95]

Just pm me and I can fix it for you.

 

[mrnapolean1]

Besides having to remove the automatic transmission and its flexplate, Can the rear main seal be replaced without having to drop the oil pan?

 

[DRAGGIN95]

Yes you can do the rear main without touching the oil pan, I have done it several times.