JIMNLIN wrote:
Ford gives the F150 three different frames thickness and modulus numbers.
.087 thickness.....4.95 LD modulus
.100 thickness.....5.73 HD modulus
.110 thickness.....6.28 HPP modulus.
Depending on which frame one can't say just slap some heavier spring on the truck and it becomes a HDPP.
Also Fleet Ford specs show the F150 has a ...
8.80 rear axle
9.75 rear axle
9.75HD rear axle.
They don't give differences in a 9.75 and 9.75HD
The OP seems to be concerned with towing stability rather than carrying capacity. The heavier frame of the HDPP seems to be aimed at carrying capacity so for his purposes beefing up a standard truck may be the better solution. Especially since Ford rates the HDPP version to tow less than the standard with Max Towing. Personally, I suspect that the lower tow ratings are due to not having a strong enough connection between the tire and the axle. That sure seems like it would be an easy thing for Ford to correct. Worst case, just put an F250 rear axle under the F150. It's been done before, some friends used to have Chevy 1500's with 8 bolt rims. These days though it might mess up fuel economy ratings.
