Vibration over 65
Thread Starter
On The Tree
Joined: Apr 2004
Posts: 191
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From: NH
Vibration over 65 I recently had a 12 bolt with 4:11's installed. At the same time I had a Spohn adjustable torque arm and lower control arms installed. I did my 3 - 10 mile break in drives. And This morning I took it over 65 for the 1st time and once I hit 65 it felt like I had really nubby tires on the rear (like you would have on an off road 4x4) The car drives fine other than that. Could my TA pinion angle not be adjusted correctly?
Thread Starter
On The Tree
Joined: Apr 2004
Posts: 191
Likes: 0
From: NH
Originally Posted by jaberwaki
yes your pinion angle could have alot to do with it...
did you get your angle finder with the TQ arm?
there is differant settings for the street and strip
did you get your angle finder with the TQ arm?
there is differant settings for the street and strip
The dent is normal, I called spohn after the same setup without the LCA's. Spohn recommended making a dent in the floor board. I used a wood 1.5" railing and rounded off the edge so I wouldn't have a sharp dent. You'll never notice it inside since it's under the rear driver side seat.
As far as vibration, Mine vibrates at 75 MPH above. I lifted the rear and put the Pinion angle gauge on the TA mount to the diff and lowered the car back on a level surface and have 0 degree pinion angle. With the spohn rigid TA mount I think we're just feeling something that was always there, just the old TA tranny mount isolated it.
My next investment is going to be in a MW balanced DS. A lighter balanced DS should do the trick but I'm concerned about the CF DS mounts to the yoke. I'm thinking of doing with the 3" CM Balanced DS.
As far as vibration, Mine vibrates at 75 MPH above. I lifted the rear and put the Pinion angle gauge on the TA mount to the diff and lowered the car back on a level surface and have 0 degree pinion angle. With the spohn rigid TA mount I think we're just feeling something that was always there, just the old TA tranny mount isolated it.
My next investment is going to be in a MW balanced DS. A lighter balanced DS should do the trick but I'm concerned about the CF DS mounts to the yoke. I'm thinking of doing with the 3" CM Balanced DS.
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I find it hard to believe that vibration over a certain speed is normal and should be excepted. There must be a reason for it, it can't be right
What I'm trying to get at is that aftermarket driveshaft suppliers may use more stringent balancing than a mass produced vehicle with rubber suspension mounts.
If you happen to find a solution, please fill me in. I would do the same.
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Teching In
Joined: Sep 2004
Posts: 22
Likes: 0
From: Clear Lake, TX
Crovax is right - vibes starting around 45-50 are usually driveline (driveshaft) related and starting at 60-70 are usually tire/wheel related. Could be bent rim/bad tire/out of balance combo. Hope for the balancing as it's the cheapest fix.
