truckernix,
Mine is a 3600 but had 1/2" U bolts on it and that is what was supplied by TMC. The holes in the axle are drilled for 1/2' not 9/16. Unless the entire front axle was replaced, I can't explain why my 3600 had 1/2" U bolts. Under any conditions, all that the U bolts do is hold the springs down onto the axle. The weight of the truck and load pushes the springs down on top of the axle. No extra weight is placed on the U bolts. They just hold the parts together and I will not carry heavy loads.
Cmayna,
Thansk for the torgue link.
John
