Greywolf I have bolted a TRD locker equipped axle from a 2002 Quad cab onto a 1994 model truck.
I had to move the spring pads on the axle in slightly, small modifications were made to the e brake cable brackets, and I later put on an adjustable brake bypass valve to to braking issues while pulling trailers. The axle width is slightly wider and may cause tires to sit outside the wheel wells depending on wheels and tires used. Fender flares could also negate this issue.
I also had to make my own wire harness to power the e locker