I'm asking this question for a buddy of mine--I don't have a first gen myself but I would like to My buddy has an '89 cab and chassis 4x4 dually with 4.10s and a 5speed that he uses as his chip truck and to haul his 7000lb chipper. The engine is 100% stock and the whole truck has only 70k or so--pretty sure it is the stock IP. We live in an area with a lot of hills and sometimes he wishes he had just a bit more oomph to pull that chipper without dropping to 2nd gear on some hills. Some basic research on my part suggests that changing out the governor spring to allow a few more rpm would be an option, but not so much as to need stronger valve springs. Any suggestions for a bit more torque and HP without breaking the bank or the truck would be appreciated.