[Shark413]

Trike, when I first noticed the stock springs were too soft and the optional stiff springs were out of stock, I tried to see if anything else would fit. I had some CEN, Mugen, Kyosho springs laying around that were the right length. The problem is that the Z-Car spring is bigger at one end than the other. The CEN and Mugen springs fit over the shock body, but the Z-Car spring retainer was too small. What I did was changed out the Z-Car shock ballend and use a Mugen ballend and retainer and everything fit, but I had a set of Kyosho Big Bores shocks and I have been very happy with them on my Inferno 777 so I just bolted them on and that is what I am currently using. But yes, if you want to use the Z-Car shocks with other springs you will probably need to change the shock ballend and spring retainer. Kyosho standard springs are too small, and the Kyosho Big Bore springs are too big for the Z-Car shocks.