Hi,
Having just run my SC10 4x4 for only the second time at Kiddy last weekend and with the weather being so good it gave loads of grip and I actually took the Kourse Kings off and ran the kit tyres. As mentioned they worked really well!
For the build, my shocks came pre-built but it's definately worth just checking the screw that holds the piston onto the shock shaft as one of mine came off inside the shock. Other than that just build as per the instructions.
And yes the harder yellow springs are probably the way to go for Astro, and might be worth considering the roll bars.
Not seen or heard of problems with the kit shell being 'weak' but I suppose it depends what you do with it. If you wanted to change, the Flotek would be the way to go.
I would recommend a 550 for a 4wd SC. A 540 will work fine, just keep an eye on the temperature.
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