I think that they will swap. I have the heavy duty spring option in my 3200, they're identical to the base springs for a 3/4 ton, and the parts for the bushings and shackles are the same according to the assembly manual. But I agree with red58, get some overloads with heavy duty shocks, or possibly a set of air shocks to support the weight, that'll kep you from losing the ride quality when unloaded.


Bill Burmeister