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Differential Cover Leaking & bolts backing out Solved!!

This is a discussion on Differential Cover Leaking & bolts backing out Solved!! within the General Help forums, part of the LSx Technical Help Section category; I posted a previous thread about this here http://www.ls1.com/forums/f6/differe...ng-out-161047/ but the issue wasn't resolved. This is more for informational purposes ...

  1. #1
    Member 79Firebird_99TA's Avatar
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    Differential Cover Leaking & bolts backing out Solved!!

    I posted a previous thread about this here Differential Cover Leaking .... bolts backing out but the issue wasn't resolved. This is more for informational purposes than anything. It's weird that I haven't read or heard of this problem before.

    I had been fighting with this problem ever since I put my poly transmission mount on where my diff cover bolts had been getting loose due to the vibration. Several bolts were missing and most of the others could not be torqued down to 22 lb/fts. So yesterday I decided to see what's going on and what's stripped. Most of the bolts threads had expanded and even narrowed!! One broke when trying to torque it to the factory recommended amount!! Thank God I was able to drill and "easy out" it; very very cheap grade bolts in there. GM was apparently trying to save a few pennies per bolt. Well I changed them all out with high grade bolts and had no problems getting the proper torque. Also I changed back to the rubber transmission mount to eliminate the vibrations as well.

    If anyone does run into this weird problem, take a look at the bolts and don't waste your time on them. Head to the hardware store!

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    Retired NOT tired SteveC's Avatar
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    I have a poly trans mount, and a T/A girdle with grade 8 bolts (ARP) holding the cover on. I have a performance TC (3000) with a 2.2 STR. I have never had a problem with the bolts loosening or backing out of the differential cover.

    SteveC
    Last edited by SteveC; 06-14-2012 at 04:11 AM.

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    Member 79Firebird_99TA's Avatar
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    Just curious - did you change the bolts to grade 8s? I too have a performance stall converter (2500 vigilante).

  4. #4
    Smiles for 9.5 Years cammed goat's Avatar
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    I can't remember if grade 8 bolts can be used as an upgrade.


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