ransmission may make more difference than engine. Even though the 92 series is no longer produced for highway use, it is still in production and probably will be for years to come. Parts and service should be available for longer than I live. In fact with a 400K TBO I hope I live long enought to reach it.
We have the 92 and 4 speed. Would love to have a 6 speed or even better a 10 speed Eaton auto-shifter.
The series 60 will give you slightly better mpg. Much of this is attributed to the transmission. More gears allows better crusing at a lower RPM.
My preference would be 6 speed allison first. 60 Series second, but neither very important overall.
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