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Friction Modifier - Ford 9"

22K views 10 replies 8 participants last post by  Onestreetrodder 
#1 ·
Have Ford 9" with traction lock. Was told by a pretty reputable source that I should run 2 quarts Torco Gear Oil, and 1 qt Ford Motorsport Friction Modifier (no substitutes). Ford parts counter says their 4.5 oz bottle of regular Motorcraft Friction Modifier is the same stuff and a lot cheaper. They say 4.5 oz is all I need. Sure don't want to risk tearing up the rear end.

Looking for some advice

Thanks
 
#6 ·
I got a 9 inch with traction lok, 28 slipne axles......and redline 75w90.

No leaks anywhere

Use silicone though, dont use that crappy paper gasket for the 3rd member to the housing. Itll soak up the oil and leak right past it.

[ February 15, 2003: Message edited by: mustang66maniac ]</p>
 
#7 ·
I get regular fliers from Randy's ring&pinion at the shop and the flier I received yesterday addressed the synthetic oil question. He strongly reccomends it, especially during break in, and he rccomends a break in period for new gears. He said that you should drive about 15-20 miles and stop for about 20 minutes for cool down, and strongly urges an oil change at 500 miles. I've never had break-in problems, but was interested in the synthetic issue. Synthetic isn't usually reccomended during break-in because it is too slick to allow parts to "wear" in, I've only encountered leakage problems in high mileage applications where seal are getting questionable.
 
#8 ·
9 inch ford gear oil

Guys - I'm just about to add 75W90 Synthetic oil to my 9" posi rear end. Am I about to make a big $$$$ mistake??? I'm getting conflicting opinions on synthetic v. regular fluid. And what's the deal with the friction modifier??? I've never heard of that. Do I need it if I run synthetic.

PLEASE GET BACK TO ME!!!!
 
#10 ·
9 inch ford gear oil

Guys - I'm just about to add 75W90 Synthetic oil to my 9" posi rear end. Am I about to make a big $$$$ mistake??? I'm getting conflicting opinions on synthetic v. regular fluid. And what's the deal with the friction modifier??? I've never heard of that. Do I need it if I run synthetic.

PLEASE GET BACK TO ME!!!!
 
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