Should rear main seal be replaced when transmission is out?
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5.0 and 5.7 Discussion, Should rear main seal be replaced when transmission is out? in Cadillac Engine Technical Discussion; On my 94 FWB. I'm about to install a new tranny and although the seal doesn't appear to be leaking, ...
  1. #1
    atikovi is offline Cadillac Owners Fanatic
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    Should rear main seal be replaced when transmission is out?

    On my 94 FWB. I'm about to install a new tranny and although the seal doesn't appear to be leaking, the car has 110K miles. Do I need a special tool to install the seal like the manual says or can I improvise something?

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    FrankieSixxxgun is offline Cadillac Owners Fanatic
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    Re: Should rear main seal be replaced when transmission is out?

    If it's not leaking, don't touch it! Putting a seal in without removing the crank rarely holds tight, so it's holding up, don't mess with it. Plus, you don't wanna drop the oil pan to do it anyway, it's a PITA.

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    ocjmakaveli's Avatar
    ocjmakaveli is offline Cadillac Owners Enthusiast
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    Re: Should rear main seal be replaced when transmission is out?

    Quote Originally Posted by atikovi
    On my 94 FWB. I'm about to install a new tranny and although the seal doesn't appear to be leaking, the car has 110K miles. Do I need a special tool to install the seal like the manual says or can I improvise something?
    Trust me do it now or else you'll regret it in 10-15K later when you have to drop the tranny again just to replace this damn $5 seal.

    I don't remember if you have to remove the oil pan to replace it because i replaced my oil pan gasket anyway but its really easy to replace the main rear seal use the fel pro seal from autozone its really good and its only 2 screws remove them and the seal comes out then just reinstall the new seal Really easy hard part is removing the trans.

    It's a part with a high chance of failing and no real reason not to replace it. I'm sure its less than $10 at autozone and they have it in stock.

  5. #4
    FrankieSixxxgun is offline Cadillac Owners Fanatic
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    Re: Should rear main seal be replaced when transmission is out?

    Maybe I'm just used to Chevy motors, but if it don't leak, don't touch it is my motto.

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