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Topic Review (Newest First)
01-19-2006 12:58 PM
Onestreetrodder
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...
04-25-2004 02:38 PM
ModelAdave
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!!!!
04-25-2004 01:17 PM
302 Z28 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
04-25-2004 11:35 AM
ModelAdave
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!!!!
02-16-2003 04:08 AM
woodz428 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.
02-15-2003 12:24 PM
mustang66maniac 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>
02-14-2003 03:19 AM
motionsigns 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.
02-13-2003 03:16 PM
mustang66maniac Redline gear oil already has friction modifier in it. That way you can run synthetic and not buy a seperate bottle
02-13-2003 02:17 PM
Deuce [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...

02-13-2003 02:11 PM
KULTULZ MOTORCRAFT Additive Friction Modifier XL-3 4FL. OZ. is all you need. Much cheaper (and same as) FMS.
02-13-2003 01:10 PM
motionsigns
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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