I just installed the new vmp gen IIR on my 1967 f100 truck with a 2007 gt500 engine and trans. Working on the tuning with vmp now as soon as it is done I would like to change out my rear end gear ratio. The truck has a IRS out of a 2004 mustang cobra when I bought the IRS it had 4:10 gears but what I don't like is at 75mph on the freeway it is at 3400rmp in 5th so I want to shift in to 6th and when I do the rpms are at 1900. I will be driving the truck mostly as a daily driver in the summer month and going to track 1-2 time a month to have some fun. I was wondering if I should go with 3:73 or 3:55 gears
Sent from my iPhone using the svtperformance.com mobile app
Sent from my iPhone using the svtperformance.com mobile app