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Thread: 87 2WD AUTOMATIC REAR TRANSMISSION OIL SEAL LEAK

  1. #1
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    87 2WD AUTOMATIC REAR TRANSMISSION OIL SEAL LEAK

    Hi
    I purchased this van a few months ago and getting it ready for summer, I have chased down and repaired most of the fluid leaks. Yesterday I pulled the driveline and replaced the rear seal at the transmission, it was dripping and making an ATF mess. I noticed when the driveline was removed that the splined shaft coming out of the transmission has some play about 3mm or 1/8" maybe a little more, should that shaft have any movement?
    I changed the seal out with an OEM replacement and took it for a test drive, still leaking. Maybe I buggered the seal driving it in but it went in pretty clean.
    Thanks for your time
    David

  2. #2
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    Re: 87 2WD AUTOMATIC REAR TRANSMISSION OIL SEAL LEAK

    There is a bushing in the extension housing that needs to be replaced as I recall. I had this issue on my 87 back in 1996 where I had a leak from the rear extension housing and replacing the seal first did nothing to stop the leak and then changing the seal again and the bushing resolved the leak and the play in the driveshaft. I don't know if this is an available part perhaps when you tap the old one out it can be matched or cross-referenced to another compatible application. Best of Luck to you

  3. #3
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    Re: 87 2WD AUTOMATIC REAR TRANSMISSION OIL SEAL LEAK

    The tail housing bushing is readily available from Rock Auto for a few dollars

  4. #4
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    Re: 87 2WD AUTOMATIC REAR TRANSMISSION OIL SEAL LEAK

    Thank you for the information, new bushing and seal cured the major leak. Will take more pics in the future and post them.

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