Gears & Axles - Weird vibrations???

well i changed my trans mount to a polyurethane one bc the old one was torn and letting the tranny move around. My problem now is i get a vibration around 70 plus, it happens ten seconds apart from eachother and its a strong vibration. What could it be?? could my driveshaft be out of balance or the U joints messed up??? Also i got rear ended two months ago and they said that nothing was wrong with my car, but i find that hard to believe when the U Haul that rear ended me pushed my car fifteen feet with my stomping the brake and barely missing the car infront of me. Im thinking i should take it back to the shop and make them fix what ever the fuck is wrong with my car.

its the poly mount toss it as far as you can

so you think that solid motor mounts will fix it???? i dont wana get rid of the poly mount it helped with tranny vibrations just now im getting this vibration.

swap that poly mount out for the stock one... if you want to change your motor mounts i would go with a poly mount thats what i have.....

the stock one was all tore up and sucked, the poly one is better and helps with shifter movement and feels like im getting more power to the ground now that the tranny stays still.

im wanting to do solid mounts anyway, as im goin to change my oil pan gasket here soon bc its been leaking a little.

i dunno man im not a fan of solid motor mounts unless its a track only car... if thats the case the vibs dont matter... I drive mine for pleasure more than track so vibs matter to me

A solid mount would cause more vibrations! I'm going back to a stock mount today.

yea ive been thinking it over and im just gonna replace them with polyurethane motor mounts, plus my tuner is gonna install a new oil pan gasket and might as well do it while he is right there.