Got the 4-speed in the correct hole in cross member, now which is negitive angle -down or up, positive angle down or up ? Still chaseing a vibration between 2800 and 3000 RPM. None up to 2800 and none after 3000. I have new tires,balanced-pull the driveshaft and had it re-balanced, everything new. Manual states front shaft 2 1/2 deg, rear 3 1/2 deg, center bearing 1 to 1/2 deg,don't know how you get the center. Have protractor, is negitive right or left of zero. I have been working on cars since 1957 and never have had a problen like this. Roger said "just don't drive between 2800 and 3000.
W Head
59 Impala 409-2,4s
W Head
59 Impala 409-2,4s