Always been a gm guy born and raised, but when i got old enough to afford diesel trucks I went with Cummins, love the motor but can't stand what's attached too it. I've been looking for duramax lbz for while now, think I may have found one. Only problem is it has a few issues, let me explain. It's a 2006 lbz 4x4 regular cab dually base model with 166k for 7 grand maybe 6, we started at 9. Ok here's what's wrong, over pressurized coolant Proly bad head gasket or egr, no biggie. But he had the tranny rebuilt by some retards that went out of business, they didn't even install the nsbu switch Wtf. But here are the codes that iam getting, p0960-706-708-722-128-700 can't read the tcu codes. It does start and drive, but obviously in limp mode. Little bout myself I've been a diesel mechanic for over ten years on heavy equipment, but never had to work on duramax trucks, just wondering if you guys think its worth 6or7 grand. Thanks,