I'm looking into purchasing a 99 chev sub with 120,000 miles. My question is what can I expect to replace or what should be replaced with this truck. Should something been replace 20,000 or 30,000 miles ago for routine mx? What should I get looked at now? my other chev truck I had was a 93 and it run great! i had it from 75K miles to 130K. Only thing I replaced was some steering components, shocks, and a starter. Now this one already has high miles and I want to do preventative mx so i don't destroy it and have to spend big $$ later down the road.