Allison Shutter
BigBlockTank,
My 2006 D/A, CC has had a shutter since day one. It gets worse with the 5th wheel in tow. I have checked the two-piece driveshaft U-joint timing, the U-joints and the driveshaft carrier bearing and they are all good. I finally decided that it is caused by the two-piece driveshaft. I once owned a 1968 Chevy truck with a two-piece driveshaft that had a shutter; when I installed a one-piece driveshaft the shutter went away. I later had that thought reinforced by a thread here at TDP. Aparently, there is a GM service bulletin on the Allison transmission shutter. The bulletin requires replacing the two-piece driveshaft with a monster one piece driveshaft. Do a search on the TDP and I am sure you will find some good information on the issue to pass onto the GM Service Tech.
Good Luck,
John
*2006 Chevy, 3500, 4X4, DRW, (LBZ) D/A, CC, LT, 252K Miles, 19.5" Wheels, Mag Hytec Transmission Pan and Differential Cover, SS Grill Guard, Racor 2 micron aux fuel filter, 100 Gallon Aux Fuel Tank, using Edge Evolution, Predator Diablosport, Kennedy ECM tune, Fitch Fuel Catalyst.
*2006 Four Winds, Dutchman, 36', RV, D/A, 5500 Kodiak.
*1993 Harley Davidson, Turbo charged, Springer Softail.
*2007 Pontiac Solstice.
*2005 Jeep, Liberty, CRD (diesel).
*Full-timing in USA, see America first.
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