Originally Posted by jayhkr
I would like to know what the standard RPM is suppose to be for this size engine? My 06 has an RPM @60mph of 1600RPM. At idle it is just above 500RPM. Is this normal, not normal. I have the 355 gear which I believe is stock. Any ideas?
OK....First off the 285 tires are killing you because of the 3.55 Gears you have.......Get new 4.10 Gears or get rid of the 285 tires.... I vote for the gears because I bet it looks great with the tires. The programmer will only adjust the computer for the tire size so that the speedo reads correct. The 4.7l is a little underpowered for the 3.55 Gears and the big tires.....4.10 Gears will make a WORLD of difference........