2011 Mustang GT Rear End Gear Problem

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12-13-2011, 11:03 AM

#11

Dustin0408

Thread Starter

Join Date: Oct 2010

Location: FL

Posts: 9

Quote:

Originally Posted by Cobrakev

Motive makes some of the Ford Racing Gears. I cant remember what letter followed the P/N of the gears. I think if Ford made the gears the P/Nwas followed by the letter A. You can google motive gears made for Ford, and come up with the P/N to stay away from. Do you know what the P/N of the gears you bought? I have a feeling you got Motive gears when you bought them. If the P/N has the letter M at the end of it, they are made by Motive. if it a letter A, those are the Ford made gears.

I'm not sure what the letter after the part number is, I bought them from summit. The part number is M-4209-88373. From what I read most of their gears are made by motive now, so that's probably why they are so noisy. I can't stand how loud it howls on decel and accel. Do you think there is anything I can do to get rid of it? I'm going to have the guy reinstall them AGAIN, third time now, to see if it goes away. Thanks for the info.

12-13-2011, 09:08 PM

#12

Cobrakev

3rd Gear Member

Join Date: Feb 2006

Location:

Posts: 557

The way the gears are cut, I dont think you can get them totaly quite. Some people after many times trying quit trying and just live with it. If your installer is charging you to try and fix them, I would bite the bullit and buy a new set of gears. I know it suxs, but the noise would drive me crazy.

12-13-2011, 09:16 PM

#13

mdskala

1st Gear Member

Join Date: Oct 2010

Location: Midwest

Posts: 64

I was told only go to a shop that does gears all the time.

12-16-2011, 11:29 AM

#14

1990lxhatch

2nd Gear Member

Join Date: Mar 2008

Location:

Posts: 153

Most techs can assemble a rear end, few actually do it properly.

If you have developed a whine for anymore than a hundred miles I'd doubt you'll ever get it to go away. Once they wear in - it's unlikely it will go away.

You could get new gears with a service part warranty and I'd have someone else set it up. It would be wise to run a pattern on the gears before you take out the carrier again - it will indentify any pinion depth or backlash issues. Sounds like he's got the depth wrong.

Calculating the correct pinion shim for a 8.8 is a matter of "feel" and you must have the gauging block at just the right angle. If he chose the wrong shim or didn't have the gauge block set perfect at 45* your depth will be incorrect.

Ask the technicians who's best at setting up gears and have him do it.....

Or I'd get my new gears under service part and take it to another shop.