I have bougth a 1977 Blazer 350 Cui. last week.
The car i an import fro US with 454 and 4 " liftkit.
The car shakes alot durring acc. a little at normal speed an drives as i shut at deccaleration.
I have replacet the fron u.joint at the front aksel, ( the rest semed fine ), hov ever there i a slak in the front sliding joint app 1 mm, and 2mm at the back slidejoint is that the problem ?. Or is it balancing of the driveshafts ?
1 universel u.joint in DK is 65 Dollars, so all help is welkom.

Sorry by the spelling, i´m from Denmark.
Mail: tiny2011@live.dk

René Jensen

 

What you are describing is most likely caused by wear/looseness in the steering assembly. The steering setups on these trucks wasn't ideal when new add age & larger tires on to it and you get the "death wobble".

You'll likely have to replace all of the tie-rod ends; 2 on the tie rod & 2 on the connecting rod (items 17, 18, 10, & 12 on the schematic in THIS LINK).