[timmypstyle]

Originally Posted by glc

My speed limiter kicks in at 96 on the speedo which is 94 on the GPS.

The rev limiter is 5400? I've been wondering what it was and don't really want to find out the hard way - at 5200 it's making enough racket! I don't have a tach - I used the diag mode on the odometer once to record RPM's and used math to calculate it out.

Actually, there is no reason to push a stock 4.2 past 5 grand - that's where the power really starts dropping off and it sounds like ass. My only mods are an Amsoil air filter and a cheap low restriction muffler which sounds like rice at high rpm's.

my 04's was 5400, my 08 i dont know but i do know the manuals have a lower rev limiter since autos shift on their own. and my 04's shift points i gave were the ones that made my turck move the quickest. too high in 2nd like you said power dropped off at 5000 or so but first seemed to be better to shift above 5000. and my 04 sounded great at all rpms. my 08 starts sounding weird above 4500. also i noticed with my 04 that with a cold air intake the trucks rev limiter raises. i know it doesnt sound right but before i put it on i just put it in 1st and kept going until the truck stopped gaining rpms and i dont remember rpms but the speed was 35mph then it kicked down. with the intake i could hit 40mph in 1st. did same thing in 2nd gear too.