140 last night srt6 . What should the rpm be at this speed ? I think it was 5500 does that sound right? I may have been in 4 th. What speed does the engine redline at ? When i reach 140 at 5500 rpm i move auto stick to higher gear but did not look to see what gear trans was in would it have been in drive at that speed and rpm. All happened very quickly , an i let off accelator when i reach 140.