'04 F250 Speedometer Correction

Anyone had any luck getting the speedometer (along with the broadcast VSS PID in the scanner) corrected for tire size? I've tried correcting every parameter for the given tire size that is found in the ECM and TCM.

Truck has 3.83 gears, and 38" tires.

Speedometer parameters set as follows:
Use VID = Disabled
Final Drive Ratio = 3.83
VSS Tire revs per mile = 530.74
N/V Base = 32.7965
N/V Min Learned = 32.0000
N/V Multiplier = 10

Even changing the N/V drastically seems to make no difference to the error between actual vs indicated.

Any help would be greatly appreciated!

Only thing I changed was VSS to 34.5 because I have heard ecm doesn?t do well over 35 in SCtX4 would only allow me to go up to I think 34 ? try doing it 1/2 VSS Instead of 383 use
373

it hasn't hit all the definitions yet but there is a PID that allows modifying the scalar that hits the Ford CAN Bus that feeds the speed signal to the cluster. I had great success with it in dev testing.

the speedo is read from the abs module. I dont believe hpt is changing anything with in that. You'll need something that can change the abs module to fix the speedo 100%