What does ur tach read at interstate speeds? Mine says in turning 2800rpm @ 72mph. I think that is a little high, like my truck isn't going into od or something. Thanks

 

99 Dodge 3.55 and at 60 mph I am at roughly 1600 RPM, 70 is about 2000 RPM.

 

96 with 3.55's, and 265/75R16's.... Right about 2200 RPM at 70-75.

I think you are not getting fourth gear, or TCC lockup. Getting any codes?

 

No cel. Key trick didn't work, tried that this morning. Looking like i'm going to have a tranny rebuild.

 

is your abs or brake light on? i lost tcc in od when my abs sensor went out, i also lost my speedo and odometer.

 

that is pretty high.

97 with 305/70's 2000RPM @ 70mph

 

i agree it is a little high. 96 1500 5.9 at 65 mph should be 2000 to 2200. take your truck out and see what your shift range is ( rpm it shifts at and how many you feel) oh works best when you put your foot in it a little.

 

97 5.2 rwd and 3.55's at 70 mph is even 2000 in overdrive, around 2800 if I lock out overdrive.

 

265/75/16 i'm going around 2000 at 70 mph

 

No lights on at all. Just high rpm's. I'm pretty sure it aint going to od or tranny slipping.