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[Serum]

I would take the 4S2P over the 10k cells. they deliver more punch, and the 10K cells are a tad too large IMO.. with the 4S2P packs you are more flexible in placing them.

I may have got an ultimate batterieholder in my sleeve, i won't elaborate on it until I've got my very own up and running. (pics will follow)

I think a 1950 would be too large to be used pointing forward, which leaves you no other option than to put it on the rear. (you have got the 1950 hiamp version, correct?) this would make it harder. the non hiamp would enable you to use the plugs under a 90 degree angle, so you might have had a change of using it pointing forward.

anyway; if you have got trouble positioning the batteries, you can always make a center thingy to align the diff to the center of the chassis. (or leave it leaning to one side and put the batteries on their side) this would put the CG higher, but on the other hand; you don't need to put that 400 gramms heavy motor above the diff.

Another good thing; you can use the Kyosho 46T spur on the diff. no need for an adaptor or such.. It's a direct bolt-on..

If you have got any other question, feel free to ask.