Speed Cal Settings confusing

[4.6_02_Black_GT]

Heys heres the scoop

I have an 02 GT. I have had 4.10 gears in awhile and I'm just now getting around to adding a speed cal...

The settings dont make sense though...here goes

stock of course the car was Tremac 3650... 3.27 with 245/45/17 tires

Dallas Mustang shows this setting 1010000010

..My car now has the 4.10..but with 275/35/18 tires...in theory my wheel size makes no difference since the 35/45 verses 17/18 maintains the same wheels circumfence..

Dallas Mustangs show this setting 1010000101(they should be the same..wheel size is not a variable)

Can someone with 4.10 and and 18inch 35 series wheels help.

 

[BlackenedSVT]

Sorry I can't help. Did you try calling them?

 

[productj1]

when i installed mine with 4.10 gear I didn't worry about the tire size. I just compensated for the gear and my speedo is pretty accurate no mor than 3-5mph off.and i have 265\40\18 on the rear.