Swapped the cheap vacuum modulator out for the recommended B&M #20234 modulator over the weekend. Small, but noticeable, difference in shifting. Now reliably shifting 1->2 at 15mph (
with exception of first shift after cranking, which is closer to 20) and 2->3 at 30 (
also with exception of first shift after cranking, which is closer to 35). That about exactly where I wanted my shift points, so thanks
@ezgn for the recommendation!
Also replaced the tie rod(s) and kingpin bushings/springs. Steering is MUCH tighter. Almost no drift in the steering wheel now, and haven't experienced even a hint of death wobble since replacing the drag links. Very happy with these results. However, the truck still has a mild shake at speeds around 40-55mph, pulls right if I let go of the steering wheel at speed, and still pulling hard to the left when I brake.
Had the front end aligned yesterday at a local shop.... guy said I wasn't far off on the tie-rod spacing when I brought it in, but they did have to do some adjusting. No noticeable improvement in shake, veering right at speed, or veering left while braking after he was through with it. Said HE thinks the veering left while braking has something to do with the suspension...maybe a loose component?
I was leaning towards something with the brakes....but when I checked over the weekend both front calipers appear to be depressing equally and the lines appear intact. I remember hearing a loud pop/snap on the front right side of the truck less than a minute before the leftward braking started... maybe that was something with the suspension...didn't notice anything other than the injured drag link (
located front left of truck) when I looked at that time, but will more closely inspect the suspension as soon as I can. Thinking maybe a tire balance will help some with high speed shake, but not expecting that to improve leftward/rightward pull.
I did give drag-link adjustment a shot to help with steering wheel alignment (
has been cock-eyed to the left since I hit a BIG hole last year), and had the alignment shop try to center the steering wheel as well.... but not much improvement seen by either of our efforts. Seems like after getting it centered, it returns to leftward lean after hitting the brakes.