Driveline Vibration
#1
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Driveline Vibration
I've been fighting a driveline vibration for quite some time now, and am not sure which step I should take to help resolve it. To start off, I have done a T-5 swap from a 700R4, and have lowered my car with an Eibach Pro kit, so it's approx. 1 1/2" lower in the rear. There are no vibrations at all until I hit approximately 70 mph, and then I can feel and hear a severe vibration. I can feel the vibration coming through the shifter if I hold on to it. I initially thought the problem could be tires, but I just replaced both rear tires, had them balanced, and the problem still exists. Here are a couple of thoughts that I had. Please give feedback.
1. The driveshaft is out of balance. I am thinking of replacing with an aluminum driveshaft.
2. The transmission I put in seems to have a growl to it at lower speeds, which I think is the bearing on the output shaft. Could this cause the vibration at high speeds. Keep in mind, it is a severe vibration. Or, would anything from the swap have done this?
3. Would lowering the car have done this? I have not put an adjustable panhard bar on yet. Not sure if that would help this problem or not. Would the pinion angle be changed enough to cause a vibration like this?
4. I am running an aftermarket poly transmission mount. I think I read somewhere once before that this can cause vibrations. Is there any truth to that statement?
I'm not sure which direction to go first, and I realy hate to unecessarily replace a bunch of parts. Any direction you can give would be greatly appreciated. Thanks guys!
1. The driveshaft is out of balance. I am thinking of replacing with an aluminum driveshaft.
2. The transmission I put in seems to have a growl to it at lower speeds, which I think is the bearing on the output shaft. Could this cause the vibration at high speeds. Keep in mind, it is a severe vibration. Or, would anything from the swap have done this?
3. Would lowering the car have done this? I have not put an adjustable panhard bar on yet. Not sure if that would help this problem or not. Would the pinion angle be changed enough to cause a vibration like this?
4. I am running an aftermarket poly transmission mount. I think I read somewhere once before that this can cause vibrations. Is there any truth to that statement?
I'm not sure which direction to go first, and I realy hate to unecessarily replace a bunch of parts. Any direction you can give would be greatly appreciated. Thanks guys!
#2
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
if it still matters to you i have a similar problem and it was the driveshaft
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Car: 89RS,89TBI FB, 91Z28, 89TPI FORMULA
Engine: 357 SBC TPI
Transmission: World Class T-5 (for now)
Axle/Gears: Strange 12-bolt 3.73
I swapped out the steel shaft for an LS1 aluminum model and I had that same vibration and a hum at 70mph. I replaced the steel shaft and my problem disappeared.
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Car: 87 Formula 350 / 89 Firebird
Engine: L98 / 2.8 V6
Transmission: 700r4 / 700r4
Axle/Gears: 9 Bolt 3.27 / 10 Bolt 3.42
LS1 aluminum driveshaft cured that same vibration problem for me too. I probrably could have changed the ujoints on my original DS, but why not get a nice new aluminum one.
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