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Tranny fluid?

This is a discussion on Tranny fluid? within the Manual Transmission forums, part of the Drivetrain category; i have been planning on draining/ refilling my tranny fluid and i have a question on what to fill it ...

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    Tranny fluid?

    i have been planning on draining/ refilling my tranny fluid and i have a question on what to fill it back up with?...should i use the factory Mercon III ATF, A Synthetic ATF, or GM Syncomesh?...Ive heard some people say that synthetic isnt really good for it, and that syncomesh doesnt lubricate well untill its warm...Any opions would be appriciated!

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    old timer blue02Z's Avatar
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    well first off you dont have Mercon-thats FoMoCo. i put Amsoil synthetic unervisal ATF in mine. do you have a stick shift? how many miles do you have on your car and fluid?

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    Quote Originally Posted by blue02Z View Post
    well first off you dont have Mercon-thats FoMoCo. i put Amsoil synthetic unervisal ATF in mine. do you have a stick shift? how many miles do you have on your car and fluid?
    Its an all stock T-56. it has 53k miles on it...miles on fluid are unknown....at least 11k on it.

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    I run the GM fluid from the dealership. OEM fill. I had put Valvoline Dexron III in it at 75K miles and it shifted like ass. The OEM stuff has smoothed it back out.

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    old timer blue02Z's Avatar
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    any gm compatable atf would should work. i would go with synthetic tho. it keeps stuff cooler and protects better

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    Member stanger88's Avatar
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    Quote Originally Posted by blue02Z View Post
    any gm compatable atf would should work. i would go with synthetic tho. it keeps stuff cooler and protects better
    T56 rebuilds recommends Mobil 1, but keep in mind, this IS a shop that fixes tranny's. I just run the GM stuff. Never had an issue with it and GM would want the fluid to be as good as possible so they dont have to put a new $2500 tranny in for all the extended warrenty guys. THAT is losing money.

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