Originally Posted by
suzukipro
Very likely on indoor at least, it just works better for me. To add insult to upgrade injury I just assembled the new C, D hinge pin holders and the rear gearbox won't drop in the recessed chassis area without the C plate hitting the back of the battery tray. The .4 Chassis must also be slightly longer or have things offset compared to the .3 Chassis. My $300.00 upgrade just turned into a $400.00 upgrade due to the need for a new Chassis.
Do Not Upgrade your .3 to a .4, unless of course the kits are out of stock and the parts are readily available...
I stand corrected on the Chassis info above, I assume I'm using an older servo/receiver tray that has the extra material on it possibly even from an EB48. The clearance issue was with the rear screw mount located mount behind the receiver box (not used on .3 or .4 Chassis). The bottom material can be trimmed off leaving enough material for the top receiver cover screw to be secured. . In a nut shell the older chassis should work with the new .4 arms and hinge pins, but the droop screw tabs might wear out pre-maturely due to their narrower width.