Canít get above 65
Still getting used to our recently acquired 99í Ultimate Advantage - Freightliner with a CAT 335. Allison transmission.
On the way home from a trip today, I couldnít get the coach over 65mph.
Accelerates fine. A lot of power below 1500rpm.
Around 60mph in 6th gear I can feel a shake. If it downshifts into 5th and goes to 2000rpm, itíll lose speed.
Stopped at a gas station for about 10 minutes, and it seemed to gain some more power for a while but lost it again after a while.
Thoughts? Could exhaust brake be restricting flow? Exhaust brake works when I have it on.
No warning lights on the dash.