Wheelin66bronco
Pure Blood
I just swapped to 4.30 gears in my 07 2500, previous was 3.73.
My question is on the speedo correction.
I run a smarty touch, which had ABS/speedo correction.
I'm running 37x12.50-18 Nitto Ridge Grapplers. With the 3.73's I had the smarty set to 35.5" tire to get correct speedo tested by GPS.
With the 4.30's I have to go all the way to a 27" tire in the smarty to get the speedo correct by GPS.
This seems way excessive to me, I figured it would be 32" which is OEM size.
Is the gear ratio a part of the ECU flash, or does it just do everything off the tone ring and tire size setting?
My question is on the speedo correction.
I run a smarty touch, which had ABS/speedo correction.
I'm running 37x12.50-18 Nitto Ridge Grapplers. With the 3.73's I had the smarty set to 35.5" tire to get correct speedo tested by GPS.
With the 4.30's I have to go all the way to a 27" tire in the smarty to get the speedo correct by GPS.
This seems way excessive to me, I figured it would be 32" which is OEM size.
Is the gear ratio a part of the ECU flash, or does it just do everything off the tone ring and tire size setting?
