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Its a kit, has turnbuckles, and a machined diff thats more of a speed ratio. The regular rs4 diff was casted pot metal. I think it has a few more goodies like the 18ss motor and HD cups at the end of the dog bones.

Totally jealous of your wheels and motor and motor mount. I would also remove the corrosion on the terminals and try new batteries. Usually a mix of batteries come from different places leaving mixed volts and mah.

Welcome to the site. Https://www.hpiracing.com/en/parts/441/std Start buying. Limited 85030 arms at $20 one front one rear. Front axles are pricey. Rears non existant. Stock up as much as you can. Last 6 month these got popular and parts are drying fast. I would buy a new car and sunday...