MustangWorks.com : Ford Forums - View Single Post - t-5 fluid answers?

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, 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.