Regeared truck, now abs light, please help

[Skylardog123]

So i regeared my 4x4 04 silverado to 4.56 on 37s, i had my guy change the tire size and gear ratio in hptuners to get rid of the abs and brake light along with c0238 code, but didnt help, i read somewhere to change these values

My tires are 36.75in tall, and i have 4.56 gears so i tried to do the math the best i could and this is what i came up with, not sure if its correct but if someone can maybe fill the numbers out for me or at least tell me how to remove the abs code, ill honestly pay someone to help me, im that desperate lol







Abs light fix

VSS PULSES PER
Mile=99,424.14
Rev-trans=

VSS OUTPUT PULSES PER
Mile=
Mile-abs=

FINAL DRIVE RATIO
Ratio=4.56
Trans revolutions/mile=2,485.6

[dhoagland]

Have you tried the gear change wizard in the edit tab? (assuming the 04 has it)
Take your stock tune, use the wizard, and it auto calculates everything.

I'm not expert here, but I have seen this suggested many times

[dhoagland]

Here are a few screen shots from an 04 4x4 with a 6.0 and a 4l80
Don't use these values, just a shot of what the wizard will do

[5FDP]

Try putting in the tire size of 35's. Putting in overly large tires in the calibration may be why it's setting the ABS light.

[village_idiot]

Those trucks do not have rear wheel speed sensors. They rely on the VSS Output Pulses ABS to calculate rear wheel speed. Once you go above about a 35, the PCM will not accurately calculate it. Set your scanner up to rear F/R wheel speeds. They will be different (This is why the light is on), and then alter the number in the VSS Output Pulses ABS until your F/R wheel speeds match. The light will go away.