There is an adjustable modulator for that tranny. You could make shifting adjustments. Don't know if the adjustable modulators are still available.
Noise I objected to in my 1989 34ft Pace Arrow was the smog pump. It screamed so loud at 55 mph it was very annoying. I installed a hose on the smog pump & ran it all the way back to the rear of the MH. Another thing I disliked about that MH was the rubber Moryde rear springs. Mine were replaced about 5 times on warranty. The generator heated up the cargo door & it warped. Had to mount piece of aluminum angle on door to make it stay closed. I bought a heavy duty switch like in cupboards & mounted in generator compartment & ran 2 power lines so I cold use both A/Cs at same time on shore power. After mods was pretty nice MH. If it wasn't for those Moryde springs I'd probably still own it. I tried to get a spring dealer to mount leaf springs under it but no one would do it. It always sagged a little on one side.