I have been searching for rear axle alignment but it looks like you cannot do this to our truck. Is this the case and if so what can we do to fix toe or the thrust angle? Thanks everyone

 

It's quite common for the thrust angle to be out on our trucks. Generally, you can loosen off the rear u-bolts and move the axle slightly forward or rearward on either side to correct the thrust angle, as there's a little bit of play between the centering pin and the lift block (or pad). On an older truck, that little space may be filled up with rust, mud and scale, so complete disassembly and cleaning may be required. It is usually easier and safer in this case to cut off the u-bolts and replace them.