T4,What kind of lube? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-28-2000, 06:29 AM
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T4,What kind of lube?

My haynes manuel says to use dexron11, but the local parts store says 85/90 gear oil....I put in the gear oil, and it seems to work,but I've only drove it a few miles...The oil that came out of it was red in color, but was awfull thick to be dexron I thought...please advise!!

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post #2 of (permalink) Old 04-28-2000, 06:55 AM
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Re: T4,What kind of lube?

That's right, 85/90, GL-5 gear oil.


'85 CJ7/258
post #3 of (permalink) Old 04-28-2000, 07:27 AM
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Re: T4,What kind of lube?

Sorry I have to disagree with the other post. The T4 and T5 transmission use automatic transmission fluid. Since you have put gear oil into the tranny is it harder to shift into reverse; does it grind more if you don't shift into another gear first? The reverse gear is a free spinning gear and the thicker the oil the more it spins and the more it grinds.

You probably will be ok with the gear oil, but the factory recommendation is dextron. Why don't you just call a Jeep dealer and ask them instead of a third party manual or a parts store.

My CJ had a T5, now upgraded to a World Class T5, and the factory recommended lubricant was dextron. As far as I know the T5 is a T4 with overdrive.

Just my two cents.

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post #4 of (permalink) Old 04-28-2000, 07:50 AM
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Re: T4,What kind of lube?

this subject has been touched on a lot....
run whatever you want..neither will hurt the tranny

it's sort of still a cj thingy....
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