Just wondering what RPM I should be seeingf at 70mph with 3.42 in a 3200stalled auto.....Just got my rear gears swaped and on the way home I was crusing around 70-75 and at 70 I'm pushin 2,250-2,300 RPMS, and at 75 2,450-2,500 RPMS..just seemed like I was going faster than 70-75....might be me though...Do come from 2.73s to 3.42s

 

you have to get the speedometer recalibrated with a gear change. you are probably off a few miles per hour but im not sure the exact amount.

 

http://www.f-body.org/gears/