I am about to purchase some gears and want to ask some questions. Going from 3.42's to 4.10's what kind of Mpg loss am I looking at? Also how much ET difference would the 4.10's from say 3.73's make and also from 3.42's? Also to through another option in what about some 3.90's? I have got some numbers on the rpm increase from my stock 3.42's to 3.73's would be around 7% which cruising at 2000 rpm would bump up to 2140 and prob. be around 2300 with the 4.10's. Shoot my some opinions and yalls suggestions or knowledge on this.

 

BTW a 3000 or 3200 stall will be added also.

 

well i had the 3:42 gears in my truck and ran 17.00 stock then went to 4:10 and droped .5 to 16.5 rpm wise with 3:42 gears runs at 70 mph at 1700 3:73 at 2000 and 4:10 2300 gas dont how much you will lose but i was getting 17.5 on the hwy with 4:10 and with 3:73 im getting 19.5 with all bolt ons personnaly i've had both 4:10 and 3:73 gears and if your going for best et times go with the 4:10

 

im also getting gears the 3.73s best for supercharger a pulling and lall around or dont even mess around get the 4.10s