Dave,
The VIN plate shows the allowable weights as 11,500 without a govenor and 13,500 with a govenor. I measured the front axle and it has the same spring pad dimesions except my front springs are 2" wide as opposed to 1 3/4" for the 1/2 ton axle. I am going to do some closer measuring and see what will fit without changing the stock appearance too much. Thanks.
Bob