need theories on rear suspension problem

[DRAGIN]

well the car is cooling fine now('94 trans am lt1) another problem is at hand in the rear suspension. when the car shifts firm from first 2 second in it or not the rearend hits the underneath of the car rather hard. i installed lakewoods LCA's with the poly bushings, brand new gas charged shocks, boxed in pan hard bar and new factory springs (factory height also) still i have the hit. i can see where it is hitting both bumpers and the trans tunnel shows contact with the shaft yoke. i installed a new trans mount, the front mount of the torque arm looks virtually new and tight. it has the factory torque arm still and it has no damage that i can see. is this common with stock f bodies? should i install a new tubular torque arm and poly mount? and will bags in the springs help? i do not ever intend to drag race this car regular it will be a street car and plan to keep the hp below 400 at the crank any advise will be great thank you!
dragin

[Jeff_in_Atl]

I put an Autozone trans mount on my old 95 Z28 and it lasted about 2 weeks. The trans mounts from the local parts store just suck. Are you sure it isn't broken again?

[Joe 1320]

broken trans mount

[Wild Willy]

Trans mount, or something is wrong with your torque arm- the torque arm takes the wind-up from your rear axle and transfers it to the tail of the transmission. Not a great design, in my opinion, but a cheap way to to it. My solution was to get a tunnel-mounted torque arm, from UMI, to take that load off the back of the tranny, and to more positively control rear axle wind up- remember, those loads go both ways, acceleration and braking-

[ConElite]

Get a Poly trans mount from Energy and call it a day.

Is it a tump right by the shifter?

[DRAGIN]

thanks for all the help

i intend to get a poly mount

[Jeff_in_Atl]

i intend to get a poly mount

Get an Energy Suspension. Do NOT get a Prothane. The Prothane is hard as a rock and transmits vibrations from the engine up into the frame of the car. I hear it is worse with automatics than 6 speeds.