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strange noise/vibration when downshifting

azrider84
Explorer
Explorer
I just purchased a 1999 Itasca 32T class A from a private party. It has about 55000 miles.
Just made a 700 mile trip and while traveling, noticed a terrible vibration (like a bumping) when going up a hill and the speed drops to around 55 and the tranny downshifts to a lower gear and it revs to around 3000 rpm. But if I mash the gas and it goes to 4000 rpm, it screams but no vibration. Also, when I'm going 60 - 65 on a slight grade and giving it gas, the same thing but only slightly happens. When I let off the gas, it goes away.

This is my first motorhome of this size so any help identifying this problem would be greatly appreciated.
16 REPLIES 16

azrider84
Explorer
Explorer
Only thing I can find that says anything about chassis is:

Chevy P3 forward control chassis...

wolfe10
Explorer
Explorer
What chassis?
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/