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Eric91Z
06-09-2006, 12:56 PM
I have a quick question. When I had the car in for an oil change last week they notied the rear end gear cover leaking a little fluid. This is fine because I noticed the same things when detailing the car one night. Not enough to leave anything on the garage floor, but it is damp around there. And they are going to do the service under warranty tomorrow. I was just wondering when they do that and change the fluid, too, do our cars need any additive in there for the limited-slip unit? I know GM cars with limited slips always had to have a friction additive added when the fluid was changed. Just wondering if the MM needs that, too? If so, just want to remind them to do that.

Thanks,
Breadfan
06-09-2006, 12:58 PM
Yes, there is friction modifier for the LSD on the Ford diff's as well. They should do it, but never hurts to ask.
Eric91Z
06-09-2006, 01:28 PM
Yes, there is friction modifier for the LSD on the Ford diff's as well. They should do it, but never hurts to ask.

Thanks. I will remind them. Just like I have to remind them about turning off the rear air suspension each time just to be sure.
RF Overlord
06-09-2006, 02:25 PM
As Breadfan said, if you're having this done at the dealer, they should know and have what to use...

But...

While you're at it...

Why not have them install synthetic fluid instead? I prefer the Motorcraft 75W-140, and that fluid is what's specified in the axle TSB, but you can bring your own Mobil 1, Red Line or AMSOIL...they'll all give you superior service.
Eric91Z
06-09-2006, 02:54 PM
As Breadfan said, if you're having this done at the dealer, they should know and have what to use...

But...

While you're at it...

Why not have them install synthetic fluid instead? I prefer the Motorcraft 75W-140, and that fluid is what's specified in the axle TSB, but you can bring your own Mobil 1, Red Line or AMSOIL...they'll all give you superior service.

I assume that the dealership should carry the Motorcraft 75W-140 (being that it is a Motorcraft product). And with the synthetic do you still need the friction modifier? And think they will use the synthetic at no additional charge being it is a warranty deal?
fastblackmerc
06-09-2006, 03:38 PM
The synthetic I used, Reline, doesn't need a friction modiier.
Eric91Z
06-09-2006, 06:14 PM
Does anyone happen to have the axle TSB number handy? Not coming up with it on my searches right now...
MM03MOK
06-10-2006, 09:13 AM
03-05-05

It only applies to cars built before January 1st of '03.
Eric91Z
06-10-2006, 09:21 AM
Thanks. I know it was for the early '03 MY cars, but was hoping they might look at it and use the synthetic as part of this warranty repair - which they wouldn't. So I went with the standard stuff with the additive. Good side is no more leak and a slight gear whine I had now seems to be gone.