Heavy vibration at highway speed under load

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77Dmax

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Location
vt
First Name
Joe
Truck Year
1977
Truck Model
c20
Engine Size
6.6
Bad motor mounts will create an odd driveline angle that can cause a vibration. I would start there.

The rotational slop in the driveshaft is probably worn spider gears and cross shaft, especially if you have been doing burnouts all over town.
 

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