A master cylinder from a turboboost model, the turboboost has a larger diameter cylinder, like a 1 1/8" diameter to a 1 3/16" if I remember correctly.
TURBOboost? You have a diesel master cylinder?
Or do you mean "Hydroboost"?
Either way, you probably have the WRONG master cylinder, incompatible with your front calipers.
A '96 C1500 almost certainly has JB5 brakes. If you ordered the heavy-duty brake package, you might have JB6 brakes. Either way, the front calipers, master cylinder, and vacuum booster are the same. The front calipers are "Low-Drag" for fuel economy. They require a 3-chamber master cylinder (Quick Take-Up) to work properly. I bet your "new" master cylinder does not have the third chamber.
That's not why your brakes are "shuddering", but it's still not right.
When I replaced the Kelsey Hayes ABS unit, the vibration went away for a month, I thought it was fixed but it returned. I bled the brakes again, only right wheel had any air, fixed it for a week. I have bled the brakes about 10 times total, makes it a little better for a while. I have read that bleeding the brakes with a scan tool might work. I am looking for a scan tool with that capability, I will check the speed sensor data when I buy a new scan tool as you suggested, thanks
Assure you have the right master cylinder. Bench-bleed the master, bleed the brakes to assure all the air is out of the master cylinder. Then auto-bleed the ABS, then bleed the brakes as usual using this .pdf guide.
See what happens.