I WANT TO PUT GEARS BUT I ALSO DO A LOT OF HIGHWAY DRIVING... CAN ANYONE TELL ME WHAT RPM'S YOU DO WITH GEARS 4:10 AT 75 MPH ??? AND WITH 3:73 ....

NOW I AM DOING ABOUT 2100 RPMS AT 75 MPH. STOCK, WELL FLOWMASTERS, THROTTLE SPACER AND K&N FILTER... I RECEIVED MY FORDCHIP ON SATURDAY,, WILL BE INSTALLING IT ON MONDYA...YEEEHAAAAAAAAA

 

Since you do alot of highway driving (at 75!) I'd say the 3.73's cause you'd be running up the RPM's with the 4.10's. I got a 97 4.2 w/5 speed and at 65 I'm turning 2000, and 83 is 2500 with a 3.08. Good luck.