Correct rear axle fluid?
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Correct rear axle fluid?
I noticed that I had neglected to change the rear axle fluid on my 93 RWD at 100k (now 118k). Anyway, I went to Ford to get the fluid. They were not very bright and claimed they didn't have any as specified in my owner's manual. I remembered that the discussion here mentioned synthetic 75W-90 fluid. So I asked them about that. They came up with a few bottles of that. However: it says 4x4 Front Axle Lubricant (Premium). The mechanic they called swears that I can use it also for the rear axle. Is this true?
On the rear sticker of the bottle it says:
- Designed for use in certain late model 4x4 front axles
- Meets Ford specification WSP-M2C201-A
Can I trust the mechanic or should I take it back? I don't want to kill my rear axle.
One more question: my rear axle is the 4.10 traction lock axle. The manual recommends adding friction modifier. Should I do that is that not necessary?
On the rear sticker of the bottle it says:
- Designed for use in certain late model 4x4 front axles
- Meets Ford specification WSP-M2C201-A
Can I trust the mechanic or should I take it back? I don't want to kill my rear axle.
One more question: my rear axle is the 4.10 traction lock axle. The manual recommends adding friction modifier. Should I do that is that not necessary?
Post Fiend
Joined: Apr 2005
Posts: 5,720
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From: Washington state
Hi Tom,
that is Ford's synthetic 75W90, the right stuff for your Aero
you will need the Friction Modifier C8AZ-19B546-A from Ford 4 ounces or 113? grams
Ford uses this hypoid lube in their 3/4 1 ton V8 diesel boy toy pullers, will stand up to extreme load heat, towing 10k lbs at 80 mph up a 5% grade with the TPS.
synthetic is the only way to go in cold climates below 0d C., flows at cold temps far better than dino fat.
why don't you use that wonderful Motul that you have avail in EU? they make a syn 75W90 w FM for traction lock diffs
if you live in the warmer low altitude areas of Sw., synthetic probably not needed.
that is Ford's synthetic 75W90, the right stuff for your Aero
you will need the Friction Modifier C8AZ-19B546-A from Ford 4 ounces or 113? grams
Ford uses this hypoid lube in their 3/4 1 ton V8 diesel boy toy pullers, will stand up to extreme load heat, towing 10k lbs at 80 mph up a 5% grade with the TPS.
synthetic is the only way to go in cold climates below 0d C., flows at cold temps far better than dino fat.
why don't you use that wonderful Motul that you have avail in EU? they make a syn 75W90 w FM for traction lock diffs
if you live in the warmer low altitude areas of Sw., synthetic probably not needed.
Last edited by 96_4wdr; Nov 5, 2005 at 06:21 AM.
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Fill your axles with the correct fluid to a level where you can just touch the fluid when you stick your finger into the fill hole. Sl;ight underfilling is ok. overfilling will result in all sorts of wheel seal leakage problems.
Ken
Ken
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Thanks guys for your answers. Actually, I have never seen Motul products in any store - although I've heard about them. So I need to get friction modifier...that's gonna be fun with those clowns at the dealership 
One more question: I checked my books about the draining procedure - seems like I have to remove the back cover and let the fluid drain. I fail to see a gasket between housing and cover - the manual says to apply liquid gasket before putting the cover back on. Is there really no gasket I need to buy....?
One more question: I checked my books about the draining procedure - seems like I have to remove the back cover and let the fluid drain. I fail to see a gasket between housing and cover - the manual says to apply liquid gasket before putting the cover back on. Is there really no gasket I need to buy....?
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
just reuse the old rubber/neoprene type gasket and any of the automotive type silicone sealer/gasket makers (called RTV here) in the tube, put on axle housing sealing surface, less messy that way, cover all of sealing surface with light film
many of the back covers are plastic, do NOT overtighten bolts=will crack, to spec torque only
bolts=21>27 nM
filler plug= 20>41nM
any brand of friction modifier will work. start with 132 grams first, any axle noise on turns=add another 132 grams
many of the back covers are plastic, do NOT overtighten bolts=will crack, to spec torque only
bolts=21>27 nM
filler plug= 20>41nM
any brand of friction modifier will work. start with 132 grams first, any axle noise on turns=add another 132 grams
Last edited by 96_4wdr; Nov 6, 2005 at 10:48 AM.
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