For my SAE formula car at school I want to make drive by wire paddle shifting. The 1st step is I need something to physicly shift the sequencial gear box. I was looking at linear actuators but they are expensive. I dont need as much percision and control as a servo but if its cheap I will consider it. Im looking for something that can apply a decent amount of force(like 10 pounds max) in a linear direction. This needs to run on a 12v and I will control it with either a PIC controller or logic gates. Also If possible I would like something (or a ciruit) that can detect the reistance of the shifter. If it encounters a certain amount of resistance I want it to stop.