My new Motive 3.73s whine

[rw0640]

I just got them professionally done yesterday, car runs great, but they whine on light throttle. I'm reading up now that a lot of motive gears are noisy. Can I expect the whine to fade after riding on them a bit or should I just get used to the sound?

 

[EHA Racing]

Motive Gears are lapped together and should not make noise. On acceleration that usually means they are a little too tight. If they whine on decel it's because they are too loose. Just my $.02

 

[Unrealford]

Yup, I agree,, And believe me after 3x I would know..

 

[RideThePony2004]

I have 4.30 motive gears in mine and do not whine at all. If they are installed right they should not whine.

 

[rw0640]

It only does it when I lightly touch the gas, like when maintaining cruise speed it seems to stop when accelerating any harder.

Also it I get a noticeable vibration when at 60-65mph any faster or slower no buzzing.

Motive Gears are lapped together and should not make noise. On acceleration that usually means they are a little too tight. If they whine on decel it's because they are too loose. Just my $.02

they told me it would whine because of the way its cut. I think I'm going to bring it in have them look at it again.

 

[BlackOut2k11]

definitely have them look at it again, sounds like they have the lash too tight hence the whine on acceleration.

 

[ShelbyGT]

my frpp 4.10's have whined since new just the same way yours do, i had it done professionally and i've messed with them myself to no avail. i've put 15k on them and the sound never changes. so maybe you should get louder mufflers to drowned it out! jk, but good luck getting the shop to look at it, hopefully the fix it for you

 

[ford20]

I think I remember reading somewhere that its a kind of trial and error thing with the Motive gears. Like they may whine but you need to shim the correctly or something like that to get them right. Like where I read that the guy had the same problem with his 3.73s that were also professionally installed and it was a shimming problem. Again I am not certain what that means but I can try and find the thread about it to see if there is a solution or a better explanation.

 

[Unrealford]

I think I remember reading somewhere that its a kind of trial and error thing with the Motive gears. Like they may whine but you need to shim the correctly or something like that to get them right. Like where I read that the guy had the same problem with his 3.73s that were also professionally installed and it was a shimming problem. Again I am not certain what that means but I can try and find the thread about it to see if there is a solution or a better explanation.

Theres shims and pinion depth among a few other issues. I helped recently with a 4.10 install. The friend says they turned out nice..
write up >> http://newyorkmustangs.com/forums/how-to-install-gears-t667.html

 

[rw0640]

my frpp 4.10's have whined since new just the same way yours do, i had it done professionally and i've messed with them myself to no avail. i've put 15k on them and the sound never changes. so maybe you should get louder mufflers to drowned it out! jk, but good luck getting the shop to look at it, hopefully the fix it for you

Thanks, I'm going to try to get it in sometime next week. When you say you've messed with them, can you adjust it without having to take everything off?

This could be a good opportunity to go for the pypes violaters

 

[ShelbyGT]

Thanks, I'm going to try to get it in sometime next week. When you say you've messed with them, can you adjust it without having to take everything off?

This could be a good opportunity to go for the pypes violaters

you have to take the rear totally apart as if you are setting it up for the first time to move the shims around to adjust the backlash(clearance between the ring and pinion)

 

[rw0640]

That sounds like a pain. I'll bring it in, just hope it doesn't end up worse.
Thank you, everyone for the feedback!

 

[RideThePony2004]

good luck man

 

[Ghostly Echo]

I have frpp 373's brand new if you want to trash those motive gears

 

[rw0640]

I have frpp 373's brand new if you want to trash those motive gears

Cool, I didn't think they made them anymore for the 7.5. I'm going to try and see how this pans out first before I consider getting rid of the motives.

I called the shop, I'm bringing it in on Saturday. but they are sticking to their guns that its a noisy gear. At this point I just want to find out what the vibration is, they say it sounds more like the driveshaft or tires and that gears won't cause shaking.

 

[Black Dragon]

frpp gears ftw

 

[Ghostly Echo]

Cool, I didn't think they made them anymore for the 7.5. I'm going to try and see how this pans out first before I consider getting rid of the motives.

I called the shop, I'm bringing it in on Saturday. but they are sticking to their guns that its a noisy gear. At this point I just want to find out what the vibration is, they say it sounds more like the driveshaft or tires and that gears won't cause shaking.

you have the 7.5 rear dude i have a mint condition gt rear in my house 8.8 i have the gears for that rear i will give it to you for 300 bucks

 

[Timspony]

....Sounds like its your back-lash...take the installer for ride & have them re-check it! GL

 

[Chuckie B]

frpp gears ftw

+1

 

[rw0640]

Assuming it is the backlash and not a noisy gear. am I doing harm driving on it now?