thanks for the reply. ok underdrives yes . please suggest mid pipe and catback system. also want to change gears. i do some hiway driving would 3.55 or 3.73 be best what kind of rpm would i be pulling with each at about 75 mph with auto tranny

 

Go with 4.10's or 4.30's, and never look back. PM Dean, (Blue02GT) He has 4.30's on his D/D Auto. My 4.10's won't be installed for a couple more weeks, so I couldn't tell you an exact number. I belive each step up in gear ratio is about 200 RPM at 65 MPH

 

with a stock size tire 26" or so you will be running 2500rpm@65mph with 4:10's and 3000rpm@75mph. Add aboout 200-300rpms to those for 4:30's


Adam