Recently I made the mistake of adding a lot of mods all at once. Now I have a vibration and dont know whats causing it. I added a 3500 vig stall, bmr strut tower brace, bmr torque arm relocation bracket, bmr torque arm, bmr relocation brackets for trailing arms, bmr trailing arms, bmr pan hard bar. Poly bushings. Now the vibration is around 30-40 mph. 1000-1700. Only when I give it next to nothing on the throttle. So little throttle the car really doesnt accelerate. It comes up more by the trans. When the converter is locked up it doesnt do it. Now if I give it 1/2 throttle still nothing. Please Help

 

Had the same probelm. it was the Poly trands mount I used. swapped the old factory trans mount bushing back in and it all went away.

 

When you added the crossmember and torque arm did you check your pinion angle? I'd start there.

 

Thanks for the help. Yes I did check the pinion angle and it is set at -2 1/2. BMR told me to put it at -2 1/2. I'll try the bushing and let you know what happens.

 

I might try closer to a -1.5 if the vibration is still there. every car is different. I run a poly trans mount and a Yank crossmember, -2 was too much for the car, closer to -1 was a lot better.

Did you tune your car for the converter? Maybe you are getting lockup chatter cause it's trying to lockup too early? However it does sound more like an issue with the pinion or tranny mount.