I had timing chains, Both turbos and cats replaced in December. I brought my own parts and it slipped time and the mechanic wont warranty it because of that. I also found out the compression in cylinder 2 is only 120psi. so my question is do I re do the timing chains Can get them done for$2500 ? replace the engine? or do the engine and trans at once and have a new drive train for 12000. truck is in good shape, no rust. lots of new parts. 200000 miles?