i posted a while back on my 5spd cummins dropping fifth gear and have been toying with the idea of putting a six speed into it but im not exactly sure what i would need to swap the NV4500 over to the NV5600 i think drive shafts are different and i already have the DHD transfer case but what else would i need to swap? my 4x4 link is adjustable and i believe my vac lines would be able to reach... does anybody have any other things like starter needs changed or something? i already had the bigger input shaft on my 5 spd so i got a clutch. and if anybody knows somewhere good to go for a 6 speed and the drive shafts or have them id apreciate a PM I'm on a college budget so money is kinda tight but i also need a truck back