I used a TCI mustang suspension. We had never done any of this before. We tack welded the suspension in and then had a professional welder come in and finish. He said we did a tremendous job of welding it in. We also have a zz4 350 and a 700R4 tranny. We didn't use the drop spindles though. Thought it would be to low. Check it out on our web page at the bottom. We have a TCI 4 link in the rear, we used the original axle center mark on the frame and then moved it about an inch and a half forward . We put the bed back on and centered everything up from there. Coach Frank