Is there any difference or desirability of gearboxes by year of production run '04 to '09? For fleaBay purposes?
Yes, some differences, gear ratios, color, maybe output shaft from 08 up (have to check this to be sure).
Personally I haven't put a used trans in a 1200RT yet but if I did I would probably stay with an RT trans & the use a pre 08 trans on pre 08 bike & use an 08-09 trans in an 08-09 RT bike.
Gotta watch the driveshafts as well. While the BMW parts fiche will say the used tranny will fit xx years, they don't point out that the driveshafts are slightly different.
When I had my tranny replaced (long story), I got a used tranny, emailed BMW to see if it would fit (no real help), emailed a couple of other dealerships besides the one doing the work.
All the dealerships stated, yes, the tranny will fit.....so, the tranny got put in,....but, the driveshaft diameter, or something, was off. I can't remember if it was a diameter or length thing. Either way, at 75k, I dropped an 18k tranny and 50k driveshaft in my bike,....that after a tranny rebuild that only lasted a bit over a year, which was completely out of the independent shops warranty.
The used tranny was right at $600, the driveshaft I believe was $200ish and the labor was $1300-1500(can't really remember),......shoulda just replaced the tranny from the get go.