Lock to center will be different
Because the pitman arm is not perpendicular to the drag link, the arm has to rotate more on left turns than on right. There might be some further geometry at the knuckle that is in play. Anyway I think you'll find about 2.3 turns left and 2.1 right if the suspension is stock.
If I can verify when that chisel strike is placed during Assembly, it will save me taking off my steering shaft to find the steering gear's center. I think it is a safe assumption to say that it reflects the steering gear center though.
Looking under the pad for the strike and seeing how that compares to the steering wheel is the best way to determine if it is centered, unless the strike means something else.
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Here's the steering photos.
Note the steering wheel chisel strike about 45 degrees left of center.
Attachment 643
Note the arrow in the plastic dust shield and the fat arrow cast into the gear housing.
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This causes three difficulties: 1) the gear's "return to center" function is constantly trying to turn the truck to the right. If you doubt this, take your hands off the wheel. This makes you work harder to keep the truck straight. 2) in a bump steer situation, it may amplify one vector 3) the gear is looser anytime you are off zero, making you work harder again to keep it in a straight line. It could be soooo much better if this was in line.