3/4 brings a whole different world of problems
The front part is the same as a 3100 so cab forward body parts are the same and mostly can be found
The bed is longer so the running boards are different and a bit harder to come by if You don’t have them.
First challenge is do you have brakes and all the break parts? Unfortunately they are made of unobtanium.
Then we move on to the differential unless you are extremely lucky it’s a 4:56, the 4:10 gears are also not to be found.
So probably need to get a different rear axil.
Once you have a rolling frame with brakes then you can move on to the rest of the drive train.
3600 box is 88 inches has 3 stake pockets, that tire size would be a 3600 single rear
More than once I have thought about just getting a 3100 rolling frame to put my 3600 front parts on.
And I’m starting with a complete truck minus the brakes, with a cab with very little rust
Stop take an inventory of what you have, then decide what you want to end up with.
Keep in mind that the wheel base and over all size is closer to something like a S10 than a 2500
