T-5 and rear end fluid

GhettoPop · 05-18-2003, 09:46 PM

Will these work out for me in my 90 GT w/114k miles? It has a t-5 and is a 100% stock daily driver. I believe the t-5 and rear's fluid have NEVER been changed!

-Redline D4 Synthetic ATF
-Redline 75w90 Synthetic Gear Oil
-Ford Friction Modifer (for rear)

Will these cause me any problems?

Also, do all 90 GTs come from the factory w/ limited-slip? I know the factory recommends Dexron III ATF in the T-5, not sure of rear end fluid weight. Please help.

LX5liter · 05-19-2003, 12:22 PM

Those fluids will work fine. Your Mustang does have a limited slip, but whether or not it still works is another story. The traction-lok could probably use a rebuild after that many miles. Take it out and see if you can get both rear wheels to spin when you take off from a dead start.

GhettoPop · 05-21-2003, 08:12 AM

Quote:

Originally posted by GhettoPop
Will these work out for me in my 90 GT w/114k miles? It has a t-5 and is a 100% stock daily driver. I believe the t-5 and rear's fluid have NEVER been changed!

-Redline D4 Synthetic ATF
-Redline 75w90 Synthetic Gear Oil
-Ford Friction Modifer (for rear)

Will these cause me any problems?

Also, do all 90 GTs come from the factory w/ limited-slip? I know the factory recommends Dexron III ATF in the T-5, not sure of rear end fluid weight. Please help.

anyone else?

MEDIK418 · 05-22-2003, 09:36 AM

First, I confess to being a true synthetic nut! That said, I recently installed a new Auburn differential in the 89. The instructions that accompanied it said to definitely NOT use synthetic fluids in the rear end. It recommended a good 85/90 gear oil and the Ford friction modifier. I have no idea why but that's what it says.

food for thought.

05-18-2003, 09:46 PM	#1
GhettoPop Gimme a Drink! Join Date: Dec 2002 Location: NYC Posts: 694	T-5 and rear end fluid Will these work out for me in my 90 GT w/114k miles? It has a t-5 and is a 100% stock daily driver. I believe the t-5 and rear's fluid have NEVER been changed! -Redline D4 Synthetic ATF -Redline 75w90 Synthetic Gear Oil -Ford Friction Modifer (for rear) Will these cause me any problems? Also, do all 90 GTs come from the factory w/ limited-slip? I know the factory recommends Dexron III ATF in the T-5, not sure of rear end fluid weight. Please help.

05-19-2003, 12:22 PM	#2
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	Those fluids will work fine. Your Mustang does have a limited slip, but whether or not it still works is another story. The traction-lok could probably use a rebuild after that many miles. Take it out and see if you can get both rear wheels to spin when you take off from a dead start. __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

05-22-2003, 09:36 AM	#4
MEDIK418 Registered Member Join Date: Mar 1999 Location: Amarillo, Texas, USA Posts: 780	First, I confess to being a true synthetic nut! That said, I recently installed a new Auburn differential in the 89. The instructions that accompanied it said to definitely NOT use synthetic fluids in the rear end. It recommended a good 85/90 gear oil and the Ford friction modifier. I have no idea why but that's what it says. food for thought. __________________ 1986 four-eyed LX coupe, 358 Cleveland, Tremec TKO600/centerforce clutch, dish cut Probe forged pistons, comp cams hyd.roller cam, .579/.588@224/230, Edel.performer, 670 holley street avenger, CPR custom built long tubes, ported and polished 4bbl heads, manley valves, beehive springs, MSD peo-billet dist/MSD6AL, fluidamper, 5 lug conv. with 17x8 bullits there's more but it's still not finished yet. Oh, and the oldest boy is turning his 89 GT into a FFR cobra this next summer.

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