vibration problems
11-28-2008, 03:14 PM
#1
Thread Starter
Join Date: Jan 2007
Location: Kansas
Posts: 48
vibration problems
Having a vibration issue with a 90 foxbody 5.0. Here is the info----
Does have a new balancer
Replaced the tail shaft bushing in the trans
Re-built the trans, all new bearings and upper shift rail area. No damaged gears
Took the input shaft, main shaft, and output shaft to machine shop to check for straightness
Took apart rear end. Checked pinion angle, checked pionion flange for trueness
Checked axles, not bent
Switched out drive shaft out of another fox that did not have any vibrations
Switched all 4 wheels and tires with other wheels and tires
Now the info when it vibrates. The best I can relate this to is mph. Cannot get it to vibrate at different rpm's. It always starts about 65mph and continues up thru over 100. It will does this either on the drag strip or on the street. I can push in the clutch pedal, no change. I can let off the accelerator, no change. Until, it gets back below 60 mph, then it quits. It is vibrating so bad, you cant keep your hand on the shifter.
Any info would be great. Thanks alot.
Does have a new balancer
Replaced the tail shaft bushing in the trans
Re-built the trans, all new bearings and upper shift rail area. No damaged gears
Took the input shaft, main shaft, and output shaft to machine shop to check for straightness
Took apart rear end. Checked pinion angle, checked pionion flange for trueness
Checked axles, not bent
Switched out drive shaft out of another fox that did not have any vibrations
Switched all 4 wheels and tires with other wheels and tires
Now the info when it vibrates. The best I can relate this to is mph. Cannot get it to vibrate at different rpm's. It always starts about 65mph and continues up thru over 100. It will does this either on the drag strip or on the street. I can push in the clutch pedal, no change. I can let off the accelerator, no change. Until, it gets back below 60 mph, then it quits. It is vibrating so bad, you cant keep your hand on the shifter.
Any info would be great. Thanks alot.
11-28-2008, 04:41 PM
#5
5th Gear Member
Join Date: Nov 2008
Location: SC
Posts: 2,401
The last one I had like that has a lightly bent axle flange. Only with a dial indecator did we find it. I've also seen a rear brake drum cause the same thing. A balance weight came off. Good luck with that one. Those are hard to find sometimes
11-28-2008, 05:41 PM
#8
in limbo
Join Date: Jan 2007
Location: Iowa
Posts: 7,300
i had the same problem. when i did my gears i still had the vibration. well my rear breaks were shot so i replaced everything for the break assemb including the drums and then the vibration stopped. so i assumed it was the drum weights.
