I have an 07.5 LMM and I've had VERY few problems with it, considering it has over 312,000 miles on it. My coolant does have an ever do slight leak. I have to add fluid about every 5-6 weeks. The only big problem that I've had was with breaking the factory tie rods. But other than that, I'm...
2007.5 3500HD GMC Sierra SLT SRW, PPE Hot Level 6 Tune Tweaked through EFI Live, EGR Delete, DPF Delete, PCV Reroute, Airdog 150, K&N air filter, MBRP 4" Exhaust, upgraded 1" Tie rods, nitro filled shocks, lengthened one piece drive shaft, Black 20" HD Monster rims, 35X12.50 Pro Comp Xtreme...