I have been working on and around the steering column as of late. I have replaced the tumbler, and the ignition switch. I get the truck to turn over and start but its not every time. I have noticed the tumbler turns but with no resistance either way, when you turn it to start the truck it does not bounce back. At times I will turn the key and I don't even get power. I have only been able to get the truck to start when the steering wheel is at its lowest position. Any ideas? The battery, ignition switch and tumbler were all replaced in the last six months.