MustangWorks.com : Ford Forums - View Single Post - T-5 and rear end fluid

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.

05-22-2003, 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.