Glad we amuse you Mike. I have no interest in the ZF box, Between the outrages price for a used trans and limited parts availibillty, it's a loser in my book. I'm only interested in a late model retrofit, I'm looking not only for the overdrive, but also the better gear ratio's of the late model 5 speed, the T5 used in Mustang's has a 3.35 first gear compared to the ultra low 4.05 of the MB 4 speed, as well as a better spread between the gears, for less RPM drop, and with a .68 overdrive it also has a deeper overdrive than the ZF 5 speed. Gear ratio's of the MB, ZF and T5 transmissions
...........................1st....2nd....3rd....4th....5th
MB 4 speed.........4.05...2.23...1.40...1.00
ZF 5 speed..........3.92...2.215..1.418..1.00.0.848
T5.......................3.35..1.93...1.29...1.00..0.68
I think the available 6 speeds are just to big to fit in the trans tunnel of the 113.