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It is an electric shift planetary unit that bolts to the rear of your tranny or transfer case, and add 14" OAL with a .78 OD ratio.
The adaptor kit is included in the $2,300.00 price tag.
I went with an Advanced Adaptors Ranger III .73 OD box, which is manually-shifted and sandwiches in between 4-spd. and bellhousing, moving entire geartrain 7-1/2" rearward; $1,500.00 and a heckuva a lot of blacksmith work!
(I may yet decide to do a double-overdrive using a GV)