first of all, i want to thank you guys for you help!
secondly, this chassie is not mine. it just looks like my chassie with one single difference (two motors goes to each gearbox).
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Just one thing, you might want to watch the chain wrap on the output sprocket. As a general rule, 120 degrees of wrap is a good idea, where it looks like you have roughly 70 degrees in the picture. An easy fix for this would be to add an idler sprocket to bend the chain down and increase wrap, which could even double as an adjustable chain tensioner.
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you mean that i need to add a sprocket on the chain that goes from the gear to the front wheels? (and just for knowlege, what are the Positives of increasing wrap? how can it affect (or improve) my driving?)