dgriffin is right, raising the gear box does increase the dog-bone plunge. What I would suggest, Jon, is moving the axle back out. You might try going back to the B4 axle, or with the longer axles you can adjust the spacers on the just inside of the hub. The Losi spacer that most people use is .100" wide - for raising the transmission I would suggest finding some axle spacers that are about .060" thick and using them inside. You'll have to add the difference (.040 or so) on the axle outside of the hub (between the bearing and the drive pin). Hope that helps some.
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