When using the narrow suspension blocks at the rear,yes you have to use the shorter swingshafts.
This is, if you don't use them you get binding at the dif side from the blades.
Even if you use a gear dif.
This also is the case if u use the shorter suspension arms front and rear.
Front you can use the 46mm but it will be a close call.
Rear you should use the 44mm or the 42mm.
Originally Posted by Mark Flores
When using the narrow blocks do I have to shorten my swing shafts or I can do with the 46mm's?