Rear main seal

[Festes]

Hi, I put a 350 rebuilt GM engine (think they were called Target Master) in my 1984 C20. Think the motor is from the 80’s - 90’s, really not sure. Rear main seal started leaking and I Want to replace. Is there any way to tell from the motor if it has a one piece or two piece seal. Thanks

 

[Rickf]

A casting date would be a start. If it's a one piece you'll need to drop the transmission, if a two piece drop the oil pan.

 

[Festes]

I’ll have to try and find the casting date

 

[PrairieDrifter]

You should be able to peek up behind the flexplate.

 

[ali_c20]

If your flex plate has a counterweight/is balanced it's a one piece if not 2 piece.