There have been numerous instances recently of 2006-08 Hummer H3 vehicles arriving on a flatbed, with a stated customer concern of a grinding noise accompanied by a neutral-out while driving down the road. By the time the tow-truck driver drops it at the shop and we begin diagnosis by attempting to duplicate the concern, the “ghost” is gone and the vehicle drives perfectly!
As best I can tell there are about 60 versions of the Honda/Acura four-speed transaxle to date. Some of these units, at a glance, look the same. Of course, as you know (usually found out the hard way), they are not the same. As a matter of fact, sometimes even when you look a bit closer they still look the same. This is mainly because of very subtle differences in the pieces and parts contained in these units.