This is a Gear Vendors/Laycock engineering overdrive unit that comes with an adaptor for a NP208 transfercase. Gear vendors makes an adaptor to mount this unit to almost any vehicle. They also have an adaptor trade in policy. You can check out gearvendors.com for more info. Unit also comes with control box, speed sensor and Eaton on/off switch. I don't know a whole lot about this unit since it came with a pickup I traded for. The previous owner said he used to pull a 5th wheel trailer.
