i have a 99' sub 4x4. had tires and alignment done at a shop. i had complained about a moaning when turning to the left at slow speeds so they said i needed a new steering gearbox as well. they installed the gearbox but when i got the truck back, alignment was fine now steering wheel was not straight. i brought it back and they straightened the steering wheel. when i got it back this time everything seemed fine. however after several miles i realized i had to constantly make adjustments to keep the truck driving straight. it seems as though the steering is too tight. there is no "play" in the steering. i brought the truck back to the shop and they said the power steering speed sensor needs to be replaced for about $320 and that "should fix it". anybody know of this problem?

thanks,
Rich