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Rear differential fluid change

This is a discussion on Rear differential fluid change within the Drivetrain forums, part of the LSx Technical Help Section category; Hey guys, I feel I need to change my rear differential fluid. My car has 83xxx miles on it and ...

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    Member Z28LS1's Avatar
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    Rear differential fluid change

    Hey guys, I feel I need to change my rear differential fluid. My car has 83xxx miles on it and the rear end cover bolts are really rusted. I'm afraid i'm going to break a bolt when i try to take the cover off.. Has this happened to anyone? Should i be worried or are the bolts strong enough? Thanks.

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    2 SS's are better than 1 Jays00ss's Avatar
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    Quote Originally Posted by Z28LS1 View Post
    Hey guys, I feel I need to change my rear differential fluid. My car has 83xxx miles on it and the rear end cover bolts are really rusted. I'm afraid i'm going to break a bolt when i try to take the cover off.. Has this happened to anyone? Should i be worried or are the bolts strong enough? Thanks.
    Just use some good penetrateing oil and let it soak for a a while. You Can always use an easy out to get the bolt out if you had to. Also a little heat would help if you have issues. You should be ok, just don't use a 3/4" drive breaker bar with a cheater.

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    how do u change the fluid? how much does it take? which kind to use? was thinking of installing a stronger rear end " pumpkin" for strength and i have no clue what im getting into but it would seem to be simple

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    Remove the 10 bolts from the cover and let the fluid drain out, and it will stink badly. It takes about 2.5-3 quarts to refill it. Get a new gasket or a gasket maker at a local parts store and you are good to go.
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    Quote Originally Posted by Z28LS1 View Post
    Hey guys, I feel I need to change my rear differential fluid. My car has 83xxx miles on it and the rear end cover bolts are really rusted. I'm afraid i'm going to break a bolt when i try to take the cover off.. Has this happened to anyone? Should i be worried or are the bolts strong enough? Thanks.
    hose those bolts down with pb blaster and let them sit for a little while and you'll be fine.

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    Quote Originally Posted by Y2KPewterSS View Post
    Remove the 10 bolts from the cover and let the fluid drain out, and it will stink badly. It takes about 2.5-3 quarts to refill it. Get a new gasket or a gasket maker at a local parts store and you are good to go.
    how do u refill it? if taking the bolts off lets the fluid out..how do u put it back in? lol..... i appologize if this sounds dumb......i havnt taken a close look at it yet

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    The fill plug is in the passenger side of the carrier near the pinion. Remove with 3/8 drive extension. Fill housing to the bottom of the fill hole, reinstall plug. After running the car, and a complete cool down, it's a good idea to recheck the level,,,sometimes they need a topping off.

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    ty very much...recommmendation of rear diff fluid to use?

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    2 SS's are better than 1 Jays00ss's Avatar
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    Quote Originally Posted by tonyjnjz View Post
    ty very much...recommmendation of rear diff fluid to use?
    Royal purple (75W-90) then you won't (Will not) need the Posi additive.

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