I have a 2008 Milan with the 2.3L Duratec and the FNR5 automatic. Lately, on a backroad near my house, I came to a complete stop, and drove off with the shifter in the "L" gate. According the to the manual, the L gate holds gears until higher RPMs, and leaves the torque converter locked during deceleration to make use of engine braking. That's exactly what it did, but I was under the impression that it would shift after a certain point. The needle on the tach reached 6700rpm, and I was still in 1st. In another instance, I was climbing a hill in 2nd, and shifted into L. As expected, it held 2nd until I shifted back into D, at which point the tach was at 5800 revs and I was going 55mph.
My question is, Is it supposed to just hold whatever gear you're in when in L, or is it supposed to upshift? It kind of got me thinking that maybe this is just a disabled version of the SelectShift gates that became available in the 2010 V6 models. If so, is it possible to add a SelectShift-type apparatus to the FNR5?