flamin_browneye
Registered Member
I'm getting ready to order a new engine and i needed to find out which rear main seal my truck has. It's a 88 GMC Jimmy W/ 5.7L and 700R4
CK5
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1 piece or 2 piece rear main seal
- Thread starter flamin_browneye
- Start date
readymix
3/4 ton status
Should be a one piece. Best way to tell is by the casting number. Or you can drop the oil pan and look for the goofy adapter found on the early blocks with the one piece rear seal
flamin_browneye
Registered Member
you can just buy a different oil pan to make it work right, cause my new engine has a 2 piece and the old one might have a 1 piece
Yours will be a 1 piece if it's original, but yes you would need a different oil pan AND also a new flexplate as the bolt pattern is different and the 1 piece seal engines are externally balanced on the rear side.
flamin_browneye
Registered Member
how much do flexplates run?
They usually cost around $40.00 or so.
