ive got a 91 isuzu spacecab and i need to convert the back to 5 lug with the simpleist way possible ive heard that toyota axles will work but im not sure any advise would be helpful

I would use '84-'88 Toyota. They are a few inches narrower than the factory axle.

can i use the isuzu driveshaft? and what years can i use for the front?

use 88-95 toyota hub and rotors. They go right onto the spindles with no problem.

now are you talking about the whole axle assembly or just axle shafts?

you will have to redrill the driveshaft for the toyota rear end or get an adapter made or even a new driveshaft. the whole rear end has to be swapped out you cant just do the shafts unfortunately. the 84-88 yota rear end is a few inches narrower. could make for a good dish on your wheels. its what i have on one of my isuzus.

and for the front you mainly just need the hubs from a junkyard off the front 88-95 toyota the rotors too if you dont plan to get new ones. you just have to run a space on the caliper to move it like 1/8 of in inch for the new rotors.