Source on frame being different from a 35 to a 37 package? To my knowledge the only thing different is the 1/16th bigger shock rod diameter, I believe more rebound, and an inch less travel in the front?
From Ford press releases, YT interview with Ford Raptor engineer, etc when the 2021 was announced .. this is why I got the 37PP versus doing it aftermarket. Ford engineer mentioned if people stick 37" tires on a 35, they would also need to install the 37-specific built/tuned shocks if they want to match the handling characteristics of the 37PP
37 has:
*Front shock has larger rod (1” diameter, ⅛” increase)
*different front spring perch
*different front shock valving
*different rear shock valving
*different rear bump stops
*different frame to accommodate spare
*different spare tire mount
*different hitch location
*Running clearance 13.1”
*Approach angle 33.1 degrees
*Departure angle 24.9 degrees
*Breakover angle 24.4 degrees
*Front suspension travel 13”
*Rear suspension travel 14.1”
*Truck height increased by .9”
35 has:
*Running clearance 12”
*Approach angle 31 degrees
*Departure angle 23.9 degrees
*Breakover angle 22.7 degrees
*Front suspension travel 14”
*Rear suspension travel 15”