Truck revs but doesn't accelerate

[RubberDuck01]

So here I am again.... When I'm driving my 5 speed, usually in 5th and highway speeds, I put the pedal down and the rpm's go up but the truck doesn't accelerate. It doesn't do it all the time and it does it mostly in 5th gear. I know this is probably an easy diagnosis but I'm no mechanic so let's here some ideas!!!Thanks in advance!!!

[bjytech]

Sounds like your clutch is starting to slip

[CUMMINSDIESELPWR]

my truck would do this, speed wouldnt change but the rpms would. changed clutch and no issue now lol

[98whitelightnin]

Yes sir, that is your clutch slipping.

[Mopar1973Man]

I tend to agree the clutch is slipping.

[CSM]

Start saving. When my 5sp did this, I made it another couple hundred miles of driving at light torque levels before it stopped working. I just ordered a South Bend unit when it slipped and I could smell the clutch material burning.

[CUMMINSDIESELPWR]

i did a valair ceramic/kevlar and all the clutch guts/rear main, total was about $1000 and 12 hrs of me and a friend replacing it and the clutch guts/ rear main while i was in there.