Are there physical differences in the transmission core itself between the Eaton 18-speed manuals and the equivalent auto-shift (3-pedal)? Have any of you converted an auto-shift to manual (or vice versa)? I've not read anything definitive on this, but one person claimed there are some internal differences in mechanical tolerances with regards to the shifters. Somehow the manual has tighter tolerances in the shift mechanism, whereas the autoshift has looser tolerances. And of course there can be a difference in the ratio of the Low gear.