Life_in_4Lo said:
thanks for the info, yes I thought the Cummins was the best ...
which year/models are the best?
Brief overview:
up to 1993 (square body style): no electronics, rotary fuel pump which is reliable but not as much power as the later years. 160 HP. Mechanical fuel pump (lift pump). Desireable (to some) because of the NP205 transfer case, locking hubs, front leaf springs, no catalytic converter or any other smog controls. Wish I never would have sold mine.
1994-1998.5: Most consider this the best engine years due to no electronics, a super-stout injection pump (mechanical, P7100), and up to 215 horses. Mechanical lift pump. Front suspension is coil sprung from here to current build, and no more locking hubs. Catalytic converters, but otherwise no smog controls. (Some years of California spec had EGR valves.)
The two above (1989 to 1998.5) are called the "12-valve" motors to distinguish them from the next ones which have 24 valves. When referring to either, 12V always means mechanically controlled injection pumps (think reliabilty/durability) and 24V means electronically controlled injection pumps with electric lift pumps. These engines are terribly easy to modify to put out far more HP while keeping it reliable.
1998.5-2002: Electronically controlled injection pump and electric lift pump, both of which are prone to failure; that said, modern work-arounds and rebuilds of the pump give much better reliability. Up to 245 HP. No catalytic conv. 4-wheel disc brakes from here up. First year for 6-speed manual was 2001. (A few made in late 2000 but had a smaller input shaft.)
2003-2004: First year for the common rail. Much quieter. Up to 305 HP. Stronger automatic trans (48RE). No catalytic conv. Due to front suspension/steering changes, these steer like a sports car. A world of difference from the rubbery feel of the 1994-2002's. I own both versions (2001 and 2003), and I'm always amazed at the difference.
2004.5 to 2007: Revised computer controlling the pump gives up to 325 HP and 605 torque:drool:. catalytic converters come back and are here to stay.
2007.5 to now: displaces 6.7 litres instead of 5.9. Lots of emission controls.
Scott