I have a pretty rusted out 74 stepside 4wd cab that I was planning to swap out for anouther cab instead of repairing. I was wondering if anyone knows is there is a difference between a 2wd cab and 4wd cab. I pretty much decided to stay between 73 and 79. I did find out that 77 and newer cabs have a different part # for the doors, so I plan if 77 or later on changing cab and doors. Thank you for any help.