68RFE and Exhaust Brake
And it works very, very nice... select the maximum gear you would like it to shift up to or down shift it as you like. It makes the exhaust brake that much more useful. I often will select 4th while driving around in town and with the exhaust brake on very seldom use the foot brake unless I need to come to a complete stop. If you do a search in this forum there are some pictures of the end of the shifter that shows the + & - switch.