Hi Don,
I pulled the front springs recently, cleaned, inspected and added Teflon liners. The chattering/jerking in second gear was present before and after the spring work. When I test drove it today, I tried starting out in granny 1st gear, 2nd gear, and 3rd gear. It only was jerky in 2nd gear.
We had 5 Chevy and GMC trucks on the farm back in the 70's with SM420 transmissions including my 56, and none of them had this sort of chatter at the time. I drove the 56 to high school and used to haul hay in the summer for extra money. Kinda stuck on what to do to fix it. Thanks.
