KD4UPL wrote:
He didn't ask how to upgrade the GVWR, he asked how to upgrade the payload capacity.
I'd find out what else was different besides the axle gears between the 7,200 and 8,200 models. If it's the exact same axle and brakes the difference may just be in higher rated tires. I hope you at least have LT tires on it and not P tires.
Air bags will help if the rear is sagging. Bigger better brakes are always a good idea. That's about all there is to upgrade for no more capacity then you need.
Otherwise, find a nice 2500 sub.
He's over the rear axle rating which would require an axle and suspension replacement (big money).
Payload is a number based off of GVWR number. Only the maker knows how it came to be.
Adding helper springs and air bags only helps with handling as it will not strength the axle, bearing, or housing that the suspension sits on top of.
With the F150 Ecoboost Screw 4WD 5.5' bed trucks, the max tow GVWR is 7650 lbs while the standard tow trucks GVWR is only 7200 lbs. Only difference for GVWR is that the rear axle is rated 200 lbs more BUT has a heavier hitch/bumper that brings down the extra capacity. The Max tow package is 75 lbs heavier than the standard tow package netting only 125 lbs more capacity BUT Ford give it a GVWR that is higher by a whopping 450 lbs!!!!
Only the maker can make/change the GVWR which establishes the Payload.
I would suggest a smaller trailer or an upgrade to a 2500 Suburban. I would even get a shorter trailer due to the suburbans short wheelbase. Don't want any run away trailer action with kids in the SUV.
BTW, tires do little. LT tires will stiffen the side walls of the tire so that the handling is better. BUT standard P tires have more than enough capacity for the truck.
Most larger P tires are rated for 2500 to 2600 lbs. X4 = 10,000 lbs!!! More than enough tire capacity out of a P-tire.
