i have a 1930 Model A pickup street rod it weighs 2520. i put new shocks on it about 4 months ago and it helped alot , was a pretty smooth ride compared to the way it was. Now after only 4 months it's riding really rough again. i hit a bump last night and it was so hard it popped the door open. should a shock go bad that fast or is there some thing else going on.It has a 78 mustang 2 front end and a 65 nova posi rear. my question is Is there something else i can do or put on to smooth out my ride with out costing an arm an a leg?