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What ever happened to the posi-lock system that (afaik) originated (and died) with the RC10GT2... Why didn't Associated ever use this in any other trucks/buggies? Does it suck? Enquiring minds want to know!

Its only purpose in my opinion were hour long Gas Truck A-Mains where a quick tire change during a pit stop was helpful. With the demise of gas truck racing there wasn't really a need for them anymore.

It's only advantage is to enable very fast wheel changes. It's been used in 1/8th on road for 30+ years, where their hour long mains mean their foam tyres can wear down and they can pit for fresh tyres which takes only seconds to change all four. That is why it was fitted to the RC10GT2, so when running in a 30 or 60 minute final if your spikes wear down then changing rear tyres would only add around 5 seconds to a fuel stop.

The disadvantages are extra unsprung weight in the wheels which affects suspension setup, and extra rotational mass which will affect acceleration and braking as it is like adding two small flywheels to each driveshaft. As electric runs 5 minute heats there is no need to change tyres during the race, so there is no need for a quick change system.

I have one on one of my T4's. Kina cool but I didn't put it on any other models. Didn't use it as much as I thought I might.