buggy would need lighter oils as the buggy wheels are much smaller so less torque is needed on them.
something like a 7-5-3 should be a starting point but jamie would know better for the hong nor,the xrays are completely different regards diff oils,im using 3-3-5 and its near perfect.
yes altering the diffs make a difference,going lighter in the middle diff will give more power to the front to help stop the car fishtailing under power on low grip tracks,but you may get the front tires ballooning a lot.
going lighter on the front gives more steering but too light means it may diff out and you will loose forward traction under power then,going heavier gives more forward traction at the expense of steering if too heavy...it all depends on the track surface
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