Help with a steering gearbox conversion

[bearhawk]

I installed a 3.5 turns lock to lock steering gearbox on my 67. It originally had a 5.5 turns ratio box with a Hydraulic assist power steering. I replaced the pitman arm with a part for a 1970, and installed a center link from a 69 to 70 c10.
My problem, with the wheel turned all the way right or left, the tires plow threw gravel. On the road a bump on the right side of the road causes the truck to dart right then left. I noticed the center link that i removed was a different length. Can this cause my problem?