vibration with new gears? -

4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Thread Tools Search this Thread
Old 07-22-2013, 02:42 PM   #1
Thread Starter
Join Date: Jan 2013
Location: ON
Posts: 37
Default vibration with new gears?

Hey there,
I just got the 373 gear kit from American Muscle. I talked to a local shop about installing them, he seems to think there may be some issue with driveshaft vibration. Has anybody else had this issue on a New Edge?
portstangly23 is offline   Reply With Quote
Old 07-22-2013, 03:27 PM   #2
Soldier GT
6th Gear Member
Soldier GT's Avatar
Join Date: Aug 2007
Location: MO/ Born and raised in Louisiana
Posts: 10,696

If a mechanic were to tell me that there may be a problem before installing a mod (especially gears) I would not let him touch my car. Ton's of guys on here have 373's, 410's and have no problem.. How much is he charging you and what brand of gears did you go with?
Soldier GT is offline   Reply With Quote
Old 07-22-2013, 03:55 PM   #3
5th Gear Member
BraMas's Avatar
Join Date: Jun 2005
Location: Holland, MI
Posts: 4,634

Very common with 4.10 and 4.30 gears haven't heard it so much with 3.73's. Most people cure vibration with Aluminum driveshaft.
I put 4.30's and had a terrible vibration at 80 put in Aluminum D/S and no vibration at all anymore
BraMas is offline   Reply With Quote
Old 07-22-2013, 04:17 PM   #4
3rd Gear Member
Join Date: Nov 2012
Location: North Carolina
Posts: 574

You should be fine with the 3.73 gears, it is one of the most common modifications we perform at my shop and there is never an issue. Especially if you bought the FRPP gears.
Stevo86 is offline   Reply With Quote
Old 07-22-2013, 09:10 PM   #5
cliffyk's Avatar
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,931

With 3.73 gears, and for any given road speed, the driveshaft is turning 11.4% faster than with the stock 3.27 gears. In 4th gear at 80 mph this would be 4000 rpm with the 3.73s versus 3500 rpm with the 3.27s--500 rpm faster. Spinning the driveshaft faster can exacerbate imbalances and/or create sympathetic vibrations that were not previously apparent.

This can worsen if the driveshaft was not remounted to the rear end drive flange is the same relative position as before it was dropped to change out the gears.
cliffyk is offline   Reply With Quote
Old 07-26-2013, 01:18 AM   #6
04Blue281's Avatar
Join Date: Apr 2013
Location: KCMO
Posts: 40

I had a hard time deciding on which shop to have install my Ford Racing 4.10 gears (just a couple of months ago). Talked with people at a few shops --- wound up going with the guy at a local dealership (because he had the most experience and knowledge).

It was a bit expensive, but the job was done to my FULL SATISFACTION. No vibration and no "gear whine". Runs just as smooth and quiet as the factory installed 3.27 gears. I quickly forgot about the extra $$ for the install.
04Blue281 is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
S197 Parts baddog671 Parts For Sale 20 07-26-2016 01:20 PM
Terminated Whipple GT battles '13 GT500 on E85 Bokeo Street/Strip 6 10-10-2015 08:28 PM
What other parts should I be concerned about if my pinion bearing went bad? KingRando 2005-2014 Mustangs 5 10-02-2015 08:06 AM
So who wins uedlose The Racers Bench 4 10-01-2015 08:31 PM
Rough idle and vibrating 4cylinderplus2 V6 (1994-2004) Mustangs 9 09-30-2015 05:26 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 05:46 PM.