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Old 02-13-2003, 02:10 PM
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Post Friction Modifier - Ford 9"

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

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Old 02-13-2003, 03:11 PM
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MOTORCRAFT Additive Friction Modifier XL-3 4FL. OZ. is all you need. Much cheaper (and same as) FMS.
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Old 02-13-2003, 03:17 PM
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[quote]Originally posted by KULTULZ:
<strong>MOTORCRAFT Additive Friction Modifier XL-3 4FL. OZ. is all you need. Much cheaper (and same as) FMS.</strong><hr></blockquote>

TRUE........very TRUE......listen to the man...

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Old 02-13-2003, 04:16 PM
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Redline gear oil already has friction modifier in it. That way you can run synthetic and not buy a seperate bottle
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Old 02-14-2003, 04:19 AM
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Same reputable source (very well known rear end company) that gave the initial recommendation about FMS friction modifier says that I should never use synthetic gear lube because it will absolutely work it's way past the seals. What's your experience.
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Old 02-15-2003, 01:24 PM
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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>
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Old 02-16-2003, 05:08 AM
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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.
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Old 04-25-2004, 12:35 PM
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Question 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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Old 04-25-2004, 02:17 PM
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Do not listen to the eggheads that tell you not to run synthetic in the rear axle. I use Royal Purple Max Gear 75/90w which has the limited slip additive already in it. No problems what so ever.

Vince
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Old 04-25-2004, 03:38 PM
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Question 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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Old 01-19-2006, 01:58 PM
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friction Modifier

I use regular rearend lube in my 9"..real oil has been around a long time and I know it will work..
Friction Monifier is a additive used with trac-loc and posi's to keep the clutchs from chattering...
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