all you can do is try it, mod it as needed, then try again. first cut out the chassis all the way up to the front shock mount (maybe even cut into it a little) spin the servo wire retainer 180 degrees for even more clearance. you also have to cut the notch on the drivers side of the tranny hole further up for clearance. Just start with moving the tranny forward as needed, then worry about the driveshafts later. The small amount you are moving your tranny may not even warrant cutting your drive front drive shaft at all. The back doesn't need cutting no matter how far the tranny is moved forward.