What should I do?

[What's_nitro?]

Well, you have two complete vehicles there. Unless you plan on buying another to put some stuff in, perhaps you should think about selling off some of it. The 9920 can't run the 600xl due to the ridiculously small RPM limit on the 9920. Your two 3s packs would be a good combo for the 600xl IF you had another MMM, or could stand to swap it from car to car.

[BL_RV0]

Yeah, I was trying to fit my 600xl into my rustler tonight, but it is too fat to fit in the narrow hole... I was thinking... pick up a zippy 4s pack and run that in rustler with the 9920 in the rustler with the vxl motor

[JERRY2KONE]

Originally Posted by BL_RV0

Yeah, I was trying to fit my 600xl into my rustler tonight, but it is too fat to fit in the narrow hole... I was thinking... pick up a zippy 4s pack and run that in rustler with the 9920 in the rustler with the vxl motor

If you can squeese a 427ci hemi into a Volkswagon bug, you can squeeze that motor in there. There are many creative ways to make a square peg fit into a round hole, if you just think outside of the box.

[What's_nitro?]

Originally Posted by BL_RV0

I was thinking... pick up a zippy 4s pack and run that in rustler with the 9920 in the rustler with the vxl motor

Wont work. BK's have a 42K RPM limit with 2-pole motors. I learned the hard way. See, like I said- "ridiculously small RPM limit".