Originally Posted by Waflet

2 differences in the slipper. 1st thinner, drilled (lighter, cooler) plates. 2nd, thicker, shorter spring. Not sure the plates make that big of a difference, but if you don't get a triad/vts, you MUST get the spring. It is so much easier to tune.

The difference in transmission case is the metric out drives. Metric out drives require metric bearings which only fit in a metric case. Again, I'm not sure how big of a difference there is between the metric out drives & the light weight sae out drives, but it is different.