I have a 1980 toyota, its got about 7in if lift, My pinion angle is to steep on the driveshaft. I have x-over steering by trail-gear, and i was wondering would the steering arms hit the leef spring if i put a 4*Degree shim in the front?? I am in the process of making a square drive shaft so i want it to be right when it goes back together. I need answers fast, Thanks

 

get a hi pinion 3rd for the front?

 

NO do NOT put a shim in - that will take your caster WAY out of whack, and you will be immensely prone to death wobble.

The RIGHT way to do it is to cut and rotate the knuckles to maintain the caster angle while reducing the pinion angle to be in line with the driveshaft (obviously have to use a CV driveshaft)

Other options are the HP third or adding a crawler box to move the tcase back.

 

You can shim the front up to the point of the caster angle limit, assuming it is a street driven rig:
- http://www.4crawler.com/4x4/ForSale/Shims.shtml#FAQ1
That would help for example if you have longer than stock spring shackles, which tend to tip the pinion angle downward and also increase the steering caster angle.

And rotating the knuckles on the axle is an option, as noted above:
- http://www.4x4wire.com/toyota/tech/rotated_housing/

 

ACTUALLY you have to use a u-joint d-shaft. Not a cv. A CV will turn smoother but it wont operate at the angles a u-joint will. I had to run a U-joint in the front back in the day when I was taller and single cased.

Besides the way to fix it is to LOWER your truck. Or get dual cases. Or get an extreem angle drive shaft$$$$. Or a highpinion diff. Or a cut and turn. But he real way is to lower that truck! Even if I was running 47" LTB's I would not need 7" of lift.