Have you ever been to a drag race and seen a Top Fuel car on backing up from the burn out have the front end steering go into having the front tires go into a right to left side (or is that left to right ?) wobble ?
This happens because the front ends are setup with a lot of positive caster so the cars are drivable @ 330MPH forward, very bad for reverse travel @ any speed above a walking pace.
This is what you are experiencing with your truck, except in the forward direction. Makes logic ?
Back when I worked automobile service most manual steering models (remember when you could buy one ?) were set up @ 0 to ½ degrees’ of negative caster (to make steering easier) and power steering units had positive ½ to 3/4 degrees’ (to make more stable). When setting up our super stocker we tried to get the most, usually over 1&1/4 degrees of positive caster.
Check it out with a local alignment shop in your area, talk is cheep. Some even will use some custom settings for the area roads and ones’ usage of the vehicle.
Last edited by DieselFord : 08-20-2007 at 11:45 AM.