The drivetrain should be sweet and quiet, so the only real culprit for noise, as Sam says, is the pinion/spur mesh.
I've found that for indoors on carpet it should be set pretty low and fairly stiff. It turns really well, so you can set the front stiffer than the back. Diffs have both got 7.5k oil in and I use Schumacher Mini-Pin yellows all round. Mine still isn't perfect, but it's OK.
Keep in touch with how you get on!
Jimmy
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1985, 1986 & 1987 Scottish 1/10th Off-Road Champion.
Re-started 2012. With Caster SK10
Driving Xray XB4 & Precirotate PRS1 V2 for 2014.
Hobby Pro PRS1 V2 2WD and PRSB10 4WD for 2015
Team Inside Line Racing with PR Racing buggies for 2016, 2017 & 2018.
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