dat dood
+1y
NV5600 (six speed) is definitely the way to go IMHO. 03-06 are common rail Cummins (best out, I think) and NO emissions bullsh!t. 04.5-06 have a lil better turbo and a few more hp/lb.ft, but don't be afraid of an 03 or 04. The 03 H.O. is factory rated at 305/555, and more is EASILY had. I lterally can't count the number of Powerstroke's and Duramax's I've smoked. Even crept away from a Duramax with bigger turbo, Sun Coast trans, and two programs stacked. I can get a TRUE 23-24 mpg at 65-70 mph with no load, high teens loaded. I have gotten 15-16 pulling an 8,000 lb. gooseneck camper at 80 mph. I swapped from 3.73's to 3.42's because it was turning more RPM than I wanted at 80 mph. Around town, empty, I get high teens, NEVER seen less than 16-17, PERIOD! If you're planning on programming it, plan on a Southbend clutch and an Airdog/FASS lift pump. The stock clutch will only take another 100hp/150 lb.ft and the stock lift pump is just barely capable of stock fueling demands. Engines are bulletproof provided you keep the EGT's down (I say below 1200 in a burst and below 1000 sustained). NV5600 is bulletproof provided you ALWAYS use the clutch to shift (if not you WILL eventually wipe a synchro). Rearends are bulletproof provided you have good pinion angle and no driveshaft vibration (but even then its just a pinion seal and reseat the pinion nut). Stock turbo's WILL spool 35psi with NO problem. If you got any other questions on what to watch out for, etc. PM me or text me at 8o3 669-93 FO 3. I'll glad to help, Brad