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1 piece or 2 piece rear main seal

Discussion in 'The Garage' started by flamin_browneye, Jun 25, 2005.

  1. flamin_browneye

    flamin_browneye Registered Member

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    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
     
  2. readymix

    readymix 3/4 ton status

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    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
     
  3. flamin_browneye

    flamin_browneye Registered Member

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    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
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    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.
     
  5. flamin_browneye

    flamin_browneye Registered Member

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    how much do flexplates run?
     
  6. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    They usually cost around $40.00 or so.
     

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