Ive never driven a Durango but know several people with them. They are a good car.
I have dealt with Jeff at Speedtech before and hes a really helpful guy.
The belts are pretty much fit and forget, i have never changed one due to wear or failure. As already said, the rear drivetrain is open, i recommend one of fredriks short rear belt covers and use some diff protectors after assembling the diffs. I often hear people moaning about needing to rebuild the diffs often, well i rebuild once before the outdoor season and once before the indoor season. They are still smooth now after approx 10 outdoor meetings. Ceramic balls are recommended RC Lazy stock those. I imagine that some are running the slipper too tight and so the diff is slipping causing premature wear.
Also, i use a small piece of foam to cover the thrust race to stop fine grit from getting into it.
As for 511 spares, you really dont need many, front and rear wishbones, front shock shaft and shock cap set, maybe some spare shock towers. Thats about it. All parts are readily available, it just means that you need to carry some of your own rather than relying on a trackside shop to carry them for you.
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