4.10 gears
4th Gear Member
Joined: Jul 2005
Posts: 1,068
From: Tampa, FL
RE: 4.10 gears
ORIGINAL: spyder7724
i've had the same problem with motive and precision 3.73's. i saw that frpp just came out with a redsigned version of the 3.73 gear. it has a back cut ring gear just like the factory set in the 05-06's. don't know if they have done the same with 4.10's yet. i can't bring myself to buy another set of gears since i'm not sure it's really the gears that cause the whine. i found that the carrier(positraction unit) has .003-.005 runout causing the gear to move oblong as it turns. this may be the culprit. it would explain why they had so many problems with the explorer and rangers also. they had 3.73 from the factory and lots of problems with noise. the mustang shares the same posi unit (31spline) as the explorer. hope you have better luck and i'll vote 4.10's or even 4.30's.
i've had the same problem with motive and precision 3.73's. i saw that frpp just came out with a redsigned version of the 3.73 gear. it has a back cut ring gear just like the factory set in the 05-06's. don't know if they have done the same with 4.10's yet. i can't bring myself to buy another set of gears since i'm not sure it's really the gears that cause the whine. i found that the carrier(positraction unit) has .003-.005 runout causing the gear to move oblong as it turns. this may be the culprit. it would explain why they had so many problems with the explorer and rangers also. they had 3.73 from the factory and lots of problems with noise. the mustang shares the same posi unit (31spline) as the explorer. hope you have better luck and i'll vote 4.10's or even 4.30's.
4th Gear Member
Joined: Oct 2005
Posts: 1,189
From:
RE: 4.10 gears
no worrys andyman those gears had less than 200 miles on them and the new set did the exact same thing so i'm positive the gears are fine. it's fords posi units that are machined wrong. i'll re-shim mine and hopefully get the noise completely gone i just have too much stuff to do and it only makes noise at 45-60mph nothing below and nothing above. my wife doesn't even notice it but i do. hell she doesn't even notice the gas gauge so i guess that didn't say much....if you have any problems let me know i'll send you the set thats in mine now. so far only a handful of people have noticed this problem in the mustangs i hope you don't[sm=gears.gif]
4th Gear Member
Joined: Feb 2005
Posts: 1,370
From: bay area
RE: 4.10 gears
so is this new frpp 4.10 (P/N is M-4209-G410-A) hawg gave out a gear that wont make noise? is that the one I need to shoot for? also can I install this myself or should I let the pros do it?
4th Gear Member
Joined: Oct 2005
Posts: 1,189
From:
RE: 4.10 gears
lostsoul-idon't know if they will make any noise or not i just know that ford has redesigned the gears. i don't know the reason but it makes me wonder. ford has a habit of engineering around a problem. for instance our stock driveshaft is a two piece unit because ford had a vibration and noise issue with the one piece. now the V6's i think still have the one piece shaft. that tells me there is a problem in the rear since the v6 uses a 7.5" rear and the GT uses the 8.8. also my 06 comes with the axle tube dampeners and the panhard bar is filled with sand to reduce noise. why didn't they just fix the problem with the rear instead of doing all this stuff to work around it? i still think the noise problem comes from the posi unit being machined wrong. it's the only part in the rear that the explorer and mustang share and they both have had issues.
4th Gear Member
Joined: Feb 2005
Posts: 1,370
From: bay area
RE: 4.10 gears
thanks for the info spyder.. maybe I should wait a little longer.. but the only way to know is to have someone try them 
.. It sure would be nice to just call them and get the truth.. haha
.. It sure would be nice to just call them and get the truth.. haha
I ♥ Acer
Joined: Nov 2005
Posts: 1,585
From:
RE: 4.10 gears
ORIGINAL: hawgman
At first it is going to be a little worse than average because you will be playing with the new gears. But over all, maybe 2 or 3 mpg
At first it is going to be a little worse than average because you will be playing with the new gears. But over all, maybe 2 or 3 mpg
If you can baby your car while driving, then the truth is the 4.10's shouldn't make any big difference in mpg, but if your like me (and many others) it's hard to keep it low when it's there for the asking...SMILE...
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