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What model Allison is your tranny? Did it come stock in your truck or did you swap it in?

Is there perhaps a commercial replacement for the 7155 that would give it the same speed, but in a 100% automatic package like the Allison? Another question: with the 6x6 and 8x6 capability in the M916/M920, is the transfer case in each of these trucks divorced or non-divorced from the tranny...

Okay, I must just be thinking of the M920 then. Is the Allison a good tranny? Manual or automatic?

The M915/916/920 has a Cummins 400 for an engine, and a Cat 7155 semi-automatic transmission, which based on feedback from others, is quirky and isn't very reliable. Is there another drop-in replacement for the CAT 7155 tranny that is more robust, preferably something in a full automatic for...