I Do This For The Glory
Join Date: Dec 1999
Location: Nobleboro, Maine
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Jeep, Chevy, Mazda, and a few other manufacturers used ATF in place of the gear oil for the colder climates. I run into it all the time up here. Even my friends SM465/NP241 setup in his HD K20 used ATF (in both) from the factory. Jeep also used ATF in the early 80's to improve upon gas mileage with the smaller motors. Heck, even the wife's '97 TJ has ATF in the transfer case. It won't hurt anything, and will flow much better. A word of caution though, if the tranny has a lot of miles on it, it may leak as the ATF is lighter in weight and thinner so it'll find leaks easier. I drain the gear oil or ATF, depending on which way I'm switching, and fill it with whatever I'm switching to, then run it for a hundred miles. Then I drain that out and typically go to synthetic, I like Mobil 1.
I typically prefer gear oil, and since changing out the manual tranny fluid from ATF to gear oil on my Mazda 323 (at 190K on the tranny), it has run smooth for the last 30K, even through the winter.
I only run gear oil in the diffs though, just not willing to experiment with them, and to my knowledge, no one ever put ATF in the diffs, although not sure of why.
To change stuff out, if it has a drain plug, I use it. If not, I like my suction gun, just route it through the fill plug and vac everything out. The suction guns are about $7 almost everywhere.
Winter Harbor, Maine
'81 CJ-8 Scrambled!
It's a Jeep, Chevy, IHC kinda thing!