Gear brands?
04-20-2009, 05:02 PM
#11
also detroit true trac 7.5 will be stronger and lighter then a stock 8.8
04-20-2009, 07:44 PM
#12
2nd Gear Member
Join Date: Dec 2007
Posts: 230
I have had a hard time with the gear manufacturer as well. I have decided on 3.73 for my 7.5. HOWEVER, cannot find ACTUAL Ford (FRPP) 3.73 gears for a 7.5 rear any longer. Only aftermarket. The FRPP part we want is M-4209-F373A. There is a -F373M (these were supposedly the ones made by Motive) and you can now find -F373N, not sure what these are, but no one carries the -F373A (or I can't locate any) so I have no other choice than aftermarket. Motives are affordable, $160 on American Muscle. I have heard stories of whine with these gears. Also heard the whine is from bad installs and not the gears themselves. Not sure who to believe or what to buy.
Going to be going with the Motives (skeptical) and have a Ford mechanic friend 20+ years to do the install. That cost is still HALF of a 8.8 rear that may be "guaranteed not to whine." Have to be cost effective these days!
If you know of REAL FRPP gears ("A") for a good price, please chime in!
Going to be going with the Motives (skeptical) and have a Ford mechanic friend 20+ years to do the install. That cost is still HALF of a 8.8 rear that may be "guaranteed not to whine." Have to be cost effective these days!
If you know of REAL FRPP gears ("A") for a good price, please chime in!
04-20-2009, 08:56 PM
#13
3rd Gear Member
Join Date: May 2008
Location: Kennesaw, GA
Posts: 808
^^OK so that's a V6?
And is this what you're looking for, 4th one down: http://www.v6mustangstuff.com/05Drivetrain.htm
And is this what you're looking for, 4th one down: http://www.v6mustangstuff.com/05Drivetrain.htm
04-20-2009, 11:17 PM
#15
3rd Gear Member
Join Date: Dec 2008
Location: megan fox's dreams
Posts: 643
I have had a hard time with the gear manufacturer as well. I have decided on 3.73 for my 7.5. HOWEVER, cannot find ACTUAL Ford (FRPP) 3.73 gears for a 7.5 rear any longer. Only aftermarket. The FRPP part we want is M-4209-F373A. There is a -F373M (these were supposedly the ones made by Motive) and you can now find -F373N, not sure what these are, but no one carries the -F373A (or I can't locate any) so I have no other choice than aftermarket. Motives are affordable, $160 on American Muscle. I have heard stories of whine with these gears. Also heard the whine is from bad installs and not the gears themselves. Not sure who to believe or what to buy.
Going to be going with the Motives (skeptical) and have a Ford mechanic friend 20+ years to do the install. That cost is still HALF of a 8.8 rear that may be "guaranteed not to whine." Have to be cost effective these days!
If you know of REAL FRPP gears ("A") for a good price, please chime in!
Going to be going with the Motives (skeptical) and have a Ford mechanic friend 20+ years to do the install. That cost is still HALF of a 8.8 rear that may be "guaranteed not to whine." Have to be cost effective these days!
If you know of REAL FRPP gears ("A") for a good price, please chime in!
04-21-2009, 06:17 PM
#16
I did a search for some FRPP 3.73's for a 7.5 rear and for the life of me could NOT find a set 
All I found was Motive's. I too have heard the stories of people who have installed Motives and have had the whine issue. I'd really like to swap out gears sometime this year but, I am skeptical as well going with Motives.
All I found was Motive's. I too have heard the stories of people who have installed Motives and have had the whine issue. I'd really like to swap out gears sometime this year but, I am skeptical as well going with Motives.
04-21-2009, 09:21 PM
#17
3rd Gear Member
Join Date: May 2008
Location: Kennesaw, GA
Posts: 808
I think the link I gave is the last form of FRPP 3.73s available but they're quite expensive and they keep going up. I recommend an 8.8 or maybe take your chance with the Motives. I've heard good things about them, more so than other brands like Richmond.
04-21-2009, 09:45 PM
#18
1st Gear Member
Join Date: Jan 2008
Location: Texas
Posts: 93
I ended up with a whine free install with Motives. At first they whined alot, but they were reinstalled, and now there's perfect silence. Just goes to show you that it's all in the install.
Also, Yukon makes some good gears for the V6 including 4.10s, although more expensive than Motives. I talked to a Ford mechanic that said he builds a majority of rear ends with Yukon gears, and they never whine.
Also, Yukon makes some good gears for the V6 including 4.10s, although more expensive than Motives. I talked to a Ford mechanic that said he builds a majority of rear ends with Yukon gears, and they never whine.
