t-5 fluid answers?

KiltedBanshees93GT · 05-20-2004, 10:10 AM

I just swapped a new t-5 from 5.0resto, into my car, and I know that the majority of folks recommend ATF fluid instead of gear oil for the t-5, (mainly iirc because of the needle bearings) But mine came w/ gear oil in it, why would the factory put non-spec flid in their tranny? I just got the thing in, and would rather not have to change the fluid already, but....
Anyway, is gear oil that dangerous for the t-5? If I need to swap, can the gear oil and ATF mix in the case without adverse effects?

Sorry, but I've heard too many opinions,and need a solid answer.

Thanks for your help,

J

tireburner163 · 05-20-2004, 10:24 AM

You need ATF in there.

Just call late model restoration supply and ask them.

-Josh, aka the tireburner

red82gt · 05-20-2004, 11:47 PM

There are a few racers and shops that swear by using gear oil in their t5's It is supposed to have trouble getting through the smaller openings but then again, the fluid in the tranny isn't pressurized so as long as the gears are swimming in it they feel that it works just fine. I'm on the fence over this one, if I had an 85+ WC T5I'd be using ATF. Older non-WC T5's are supposed to use gear oil since the do not have the bearings below the countershaft but if yuour tranny is new then I don't know why it would have gear oil in it..

05-20-2004, 10:10 AM	#1
KiltedBanshees93GT Registered Member Join Date: Jun 2000 Location: Pigeon Forge Tn Posts: 611	t-5 fluid answers? I just swapped a new t-5 from 5.0resto, into my car, and I know that the majority of folks recommend ATF fluid instead of gear oil for the t-5, (mainly iirc because of the needle bearings) But mine came w/ gear oil in it, why would the factory put non-spec flid in their tranny? I just got the thing in, and would rather not have to change the fluid already, but.... Anyway, is gear oil that dangerous for the t-5? If I need to swap, can the gear oil and ATF mix in the case without adverse effects? Sorry, but I've heard too many opinions,and need a solid answer. Thanks for your help, J __________________ ____________ '66 Mustang Coupe- AKA "Lenore" on disability for a (long) bit '93 GT Mostly stock AKA "Fawkes" Rice Haters Club Member #239 "I find your lack of faith...disturbing." "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats." H. L. Mencken

05-20-2004, 10:24 AM	#2
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	You need ATF in there. Just call late model restoration supply and ask them. -Josh, aka the tireburner __________________ 1987 Buick T-type 1998 HD Electra Elide

05-20-2004, 11:47 PM	#3
red82gt Sober voice of Reason Join Date: Nov 1998 Location: Kelowna, B.C., Canada Posts: 1,514	There are a few racers and shops that swear by using gear oil in their t5's It is supposed to have trouble getting through the smaller openings but then again, the fluid in the tranny isn't pressurized so as long as the gears are swimming in it they feel that it works just fine. I'm on the fence over this one, if I had an 85+ WC T5I'd be using ATF. Older non-WC T5's are supposed to use gear oil since the do not have the bearings below the countershaft but if yuour tranny is new then I don't know why it would have gear oil in it.. __________________ 393W: AFR 205's, hydraulic roller, TKO600.

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