moving the front axle forward.
there are several things.
the first is the drive shaft, it will have to be longer.
the shock mounts will take about 3 inches before you have a problem.
the stock axle on the pass side has the extra hole. you just have to drill out the drivers side mount this will move it about 1 and 3/8 inches forward.
cross over with out bump stops will still hit your oil pan. so you will need to make some. when measureing remember that the front axle moves backwards when compressing. you will need these with your lift. you DO NOT want to have a hole in the oil pan. and you are trying to stay as low as possible.
flex your truck after moving the axle forward and get out the tape measure. mark on the frame where you are going to put in the bump stop.
leave an extra 1/4 to 1/2 inch compression of the rubber part of the stop.
now that you have your bump stops in place, put a tie wrap on your shock. go flex it up again or go wheeling. now you can often move your shock mount down. you can use or flip the rubber mounts. you are looking for the down travel.
for toyota's don't go for much more then 14 inches on the shocks with leaf springs.
reason for moving axle forward, and bump stops.
reason for down travel...
you can see that the tire is almost in front of the bumper. these are cheap 12 inch shocks.
I droped the bump stops 2.5 inchs and still put a dent in my oil pan from the cross over steering.