GMC Burbalade
Busy slacking
I used the kit from Offroad Design, and a Dana 50 from a 2000 F350 Super Duty.
The Offroad design kit I highly recommend. It's a little bit pricey, but still a LOT cheaper than some of the other companies.
The Super Duty axle (50 or 60) I do NOT recommend unless you're building your own brackets and swapping to a Super Duty rear axle as well. For 99% of applications, I'd recommend the 85-98 Ford Dana 60s. The earlier models (92 and older I believe?) have king pins and are easier to setup crossover steering. While the knuckles are weaker on these, there's more aftermarket options for knuckles. The newer 93-98 models have ball joints, which are a LOT easier to service/replace than king pins, but tend to wear out faster.
The Super Duty axles use a metric lug pattern, unit bearings (more expensive, but easier to replace) and have a wider spring perch width that no one makes a kit for.
The Offroad design kit I highly recommend. It's a little bit pricey, but still a LOT cheaper than some of the other companies.
The Super Duty axle (50 or 60) I do NOT recommend unless you're building your own brackets and swapping to a Super Duty rear axle as well. For 99% of applications, I'd recommend the 85-98 Ford Dana 60s. The earlier models (92 and older I believe?) have king pins and are easier to setup crossover steering. While the knuckles are weaker on these, there's more aftermarket options for knuckles. The newer 93-98 models have ball joints, which are a LOT easier to service/replace than king pins, but tend to wear out faster.
The Super Duty axles use a metric lug pattern, unit bearings (more expensive, but easier to replace) and have a wider spring perch width that no one makes a kit for.