Ok so i got a 4" lift kit. for my 81 blazer/ Kit(new leafs,shocks, stearing arm and rear shakle flips) Got the kit installed and seems to be fine BUT!!! when i drive down the road the truck shakes ALOT. I didnt have the problem before the kit. I took the front shaft out and im waiting for the new one. So the front shaft ant maken it shake. I tryed with the wheels locked and unlocked no change. The rear shaft seems to be fine and i have 2degs from tcase to rear axle. so i think im fine there. the local tire shop said my tires and aligment are ok. i have no movement in the rear axle from side to side and new u joints all around. But i still have a funny shake. and its a big shake. so much i dont drive it. it only shakes when i give it the gas. no matter the speed 10,20,30 and i let off the gas and she smooths right out. anyone have any ideas?????