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No advantage, it is not a very significant difference... it is probably just a typo in the documentation...:)

Yes, I believe those ratios from the Allison 3700 brochure are for the trans and transfer combined. The transfer adds that 1.2:1 to ALL the gears output from the transmission(1-7 and R) 1st gear is generated in the transmission, as it must be to drive the P3 planetary carrier which drives the...

Yes they are, and they aren’t:) Those six ratios listed are the core ratios out of the 3000 series transmission which the 3070 uses for 2nd thru 7th gear. The transfer case applies an additional 1.2:1 ratio in fixed gearing. When you multiply those ratios by 1.2 you get the final driveshaft...