RE: Solid diff
I bought a used V one R with a front one way that had been drilled and pinned to make it a solid axle. It seemed to work for me although it was my first car and I didn't know any different. I have since bought another V one and it has the standard one way in the front. I like this car much better although I have only been able to drive the car a couple of times. With the solid axle up front I had four wheel brakes. It was easier for me to brake in the corners without spinning out. Now with the one way up front I have to be careful when braking to keep from looping it in the corners.