Truck chassis - where to get?

[Madda]

There aren't many axles out there, they are quite a big problem to find if you don't wanna spend 300 on one axle.

I might consider making axles myself but I don't know how to make diff lock and unlock work in there. That would be a big problem...

[SonoranWraith]

It is 1/14 scale cab for a Tamiya kit so it depends on how many axles/frame length you want if you were to use the stock rails.