I just had 4.10's installed and am in the process of breaking them in. I didn't have the calibration done (PCM program) to it and wondered if anyone cold tell me how far off the speedo is (5,8,10 mph ect..).

Thanks

 

Depends on what trans/programming is in the car now. You can go to www.f-body.org/gears/ and from your stock gears change it to 4.10 and use your tach until you get it changed.

 

Jeez, if that spead sheet is right then things are off pretty good. At 2k rpm in 6th my speedo seems to be around 85 ish if my memory serves me correct.

Hopefully things will be fixed tomorrow afternoon, so I won't have to worry about anymore rogue cops following me on an open road with no-one else to pace.