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Yeah, forgot slow too. On the tranny, I suppose some of the later released trucks may have had the Williams exhaust brake, which supposedly helps with the shifting, since it helps slow the big Cummins down quickly between gears. Although, if you are not pulling a load and really revving it...

I'm sure someone will chime in who owns one, but the main drawbacks are: 1) 9.5 feet wide (overwidth - need permit just to drive it on any road) 2) non-synchro tranny designed for the powerband of the gas motor (very hard to shift up much less down. Several guys will tell you they start in 2nd...