i'm rebuilding my 06 3500 trans now as i speak (cummins 42,00 miles) i found a few things that contributed to the clutches and band failure. the o-ring on the reaction shaft was not there which made a pressure loss for the converter, and the second gear lever is a 5.0, these were used on the hemi-sixpack cars back in the day and they have to be adjusted quite often.my fault on that.i'm not sure if the electric line pressure is working to well either. i agree that the fluid is to slick so i use ford type-f in my racing trans also. never had a problem in 35 years of racing. also my 92 diesel had 185,000 and no problems except the throttle pos. switch for overdrive kept going bad.