Rear end shake - MustangForums.com


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

Reply
 
 
 
Thread Tools Search this Thread
Old 08-03-2007, 02:25 PM   #1
koumiss45
2nd Gear Member
Thread Starter
 
Join Date: Mar 2006
Location:
Posts: 378
Default Rear end shake

Ok when I am drving down the highway at anything above 40 mph my car shakes when I let off the gas. It doesn't seem to matter what gear I am in, although it may do it more when I am at a lower rpm, it also does it in nuetral.... it feels like the back of the car is bouncing very rapidly and shaking.... it seems more up and down than side to side. it is a medium to large vibration...any guesses on what it can be....it doesnt do it when I am on the gas.
koumiss45 is offline   Reply With Quote
Old 08-03-2007, 02:41 PM   #2
Pest007
2nd Gear Member
 
Join Date: May 2007
Location:
Posts: 338
Default RE: Rear end shake

I'd say tires are out of balance or bent rim
Pest007 is offline   Reply With Quote
Old 08-03-2007, 02:48 PM   #3
jpmustanggt
5th Gear Member
 
Join Date: Apr 2005
Location:
Posts: 2,613
Default RE: Rear end shake

It's got to be something with the tires or suspension I think.
jpmustanggt is offline   Reply With Quote
Old 08-03-2007, 02:52 PM   #4
koumiss45
2nd Gear Member
Thread Starter
 
Join Date: Mar 2006
Location:
Posts: 378
Default RE: Rear end shake

Wouldnt the tires be doing it at all times? And the suspension also? I was thinking it might have to do with when the drive line shifts position when i get off the throttle.
koumiss45 is offline   Reply With Quote
Old 08-03-2007, 03:22 PM   #5
MrChubs1
3rd Gear Member
 
Join Date: Jun 2007
Location:
Posts: 717
Default RE: Rear end shake

I was going to say u-joints or trans mount, but it's weird that it does it in neutral too. Is it much worse if you decel from a higher RPM in a lower gear (hi-load decel)?

Pinion angle issue?
MrChubs1 is offline   Reply With Quote
Old 08-03-2007, 03:28 PM   #6
Ryan86272
5th Gear Member
 
Ryan86272's Avatar
 
Join Date: Aug 2006
Location: same as you.
Posts: 3,287
Default RE: Rear end shake

My tranny mount is bad..... Only when i give it gas or downshift... NOT in Neutra(no Torque) Once there is any torque u can hear it Knockin I dont think his problem is the Tranny Mount
Ryan86272 is offline   Reply With Quote
Old 08-03-2007, 05:39 PM   #7
koumiss45
2nd Gear Member
Thread Starter
 
Join Date: Mar 2006
Location:
Posts: 378
Default RE: Rear end shake

I have the car lowered just a little, pro kit. Could a combination of a bad tranny mount plus this cause my issue? How can I tell if I have a bad mount, just get under it and look. Tranny mount is on top right?
koumiss45 is offline   Reply With Quote
Old 08-03-2007, 07:17 PM   #8
ackuric
4th Gear Member
 
Join Date: Jan 2006
Location:
Posts: 1,143
Default RE: Rear end shake

no the tranny mount is under neath the tranny in between the crossmember and the tranny

you would know if you had a bad tranny mount, your shifts would be horrid, and you'd feel the tranny bouncing around underneath you when cruising in o/d on a bumpy road. you wouldnt call it a rear end shake, the tranny is way closer to the front, and you feel it right where you sit.

my guess is rim/tire issue.

btw hijacking the thread, our stock mounts for the trannies SUCK, give way too much play. i wonder if code has upgraded his mounts to polyurethane or solid, hmmm.
ackuric is offline   Reply With Quote
Old 08-04-2007, 01:13 AM   #9
koumiss45
2nd Gear Member
Thread Starter
 
Join Date: Mar 2006
Location:
Posts: 378
Default RE: Rear end shake

Again ... wouldn't that do it all the time? How about a U joint or a carrier bearing
koumiss45 is offline   Reply With Quote
Old 08-04-2007, 01:15 AM   #10
koumiss45
2nd Gear Member
Thread Starter
 
Join Date: Mar 2006
Location:
Posts: 378
Default RE: Rear end shake

It doesnt seem to be rpm specific....seems to be speed of drive shaft specific...the faster that boy is turning the worse it is....and nuetral is maybe a little worse.
koumiss45 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
11" wide rear wheels/tires mmarsh3014 Wheels & Tires 1 10-20-2015 10:08 AM
Cam and rear end gear questions Ryan Fitzpatrick New Member Area 3 09-14-2015 03:21 AM
Pinion angle, poly bushings, 1 piece DS mtgldr S197 Handling Section 1 09-10-2015 10:43 PM
Upgrading to handle slicks? Info needed Dragonus18 4.6L (1996-2004 Modular) Mustang 8 09-09-2015 02:21 AM
Video - 2015 Steeda Mustang Product Testing (Prototype Suspension Parts) tj@steeda Steeda Autosports 0 09-01-2015 09:16 PM


Tags
1996, 2002, 2004, 40mph, axle, bouncing, downshift, end, ford, gt, mustang, rear, shake, shakes, shaking, vibration

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


All times are GMT -5. The time now is 07:20 PM.