My speedometer reads about 10 MPH slow, is there a way to fix this problem? I have 15" rims with
215r65's, a 2 speed powerglide with 3:08 gears. I also want better gears for the rear end, more lower
power but still good highway, any thoughts. Thanks

Have you changed rim sizes from a 14" rim to a 15" rim? Often times that can affect what speed your speedometer reads. Hope this helps

For speedo gear help, check out this site:
www.geocities.com/MotorCity/Lane/3969/speedo.htm (http://www.geocities.com/MotorCity/Lane/3969/speedo.htm)