4 speed vs. 6 speed
We're shopping for a "new to us" diesel pusher, and for a number of reasons, have narrowed things down to an early nineties Monaco Crown Royale, Signature, or (slightly later) Executive. There seems to be some variation in which transmission was used in these coaches. I've seen 4 speed, 4 speed with dual speed rear end, 5 speed, and 6 speed (all Allison of course, though it seem sometimes different models) used with both 8.3 and 10 liter Cummins engines.
I'm hoping that someone out there has had experience with the various ones and can tell me which they preferred, and which gave better fuel economy.
Also, if there was a specific date, when did they switch from 4 to 6? Were different rear end ratios offered with the same trannys?
Any and all information is greatly appreciated!