did some looking, main difference is that it is a 5 speed and first gear is lower, but 5th is still 1 to 1 like the 643
and you will go really slow in reverse, MT643 is like 5 to 1 in reverse
it is also about 5 inches longer than an MT643
nput power: 300 hp max Input torque: 950 lb/ft max
Input speed: 1900-3000 rpm
Transmission gear ratios:
1st: 4.17:1
2nd: 2.21:1
3rd: 1.66:1
4th: 1.27:1
5th: 1.0:1
Reverse: 10.76:1
Torque converter ratios:
TC430: 3.59:1 (crawl ratio: 14.97:1)
TC495: 2.21:1 (crawl ratio: 9.22:1)
TC496: 1.83:1 (crawl ratio: 7.63:1)
TC497: 2.7:1 (crawl ratio: 11.26:1)
Crawl ratio: first gear ratio x torque converter ratio
~Ben
stolen from
- Canadian Public Transit Discussion Board
and since groveport is only a couple of hours away for me, I might buy one, it would be a nice spare