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Thread: Rear main seal replacement?

  1. #1
    Join Date
    Aug 2012

    Rear main seal replacement?

    Last weekend I was told by a shop that my rear main engine seal is leaking and would need to be replaced. I was told that they would need to drop the transmission in order to access and replace that seal... Is this true? I know that on other vehicles the rear main seal can be replaced by removing the oil pan without having to remove the transmission.


    By the way I have a 2004 CTS with the 3.6L engine.

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  3. #2
    calif phil is offline Cadillac Owners Enthusiast
    Automobile(s): 2014 ATS
    Join Date
    Jan 2013
    Modern vehicles have a one piece rear seal and you do need to drop the transmission to replace
    I would look at the valve covers to make sure what's leaking by the rear seal is not running down from above.


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