KY joked:
"Go with #1. If you're not off roading, which I assume you're not since you have a 4X2, the trac-loc is plenty. The 4.10's will get you moving quicker, and shouldn't cost you too much mpg at interstate speeds considering the overdrive ratio of the 42RLE is .69:1. It's a noticeable drop with the 45RFE and a .75:1 overdrive. The 4.10's will not affect your speedometer. All you need to do is reset your computer, and it will figure out the 4.10's."
( stupid YOU ME 'D) I've put my locked 4x2 through more than most of you will EVER put your 4x4 through and I have the 45RFE tranny. I do frequently have the tires off the ground so I wanted to know if trac-loc will put any usable power to the on ground tire. I know the tru-trac will with brake modulation as I have it in my chevy.
"Changing gears shouldn't affect your speedometer as wheel speed is read from the ring gear which is directly linked to the wheels."
So thats what that wire is for
So, I don't need the dealer to reprogram nothing for the gear change?
NEXT !!!!