I have an all original 1978 GMC K15 Sierra Grande 4x4 w/159k miles. All. Original. I'm stumped. I just put the truck up for sale and of course it starts making noise from the front left wheel assembly area. The knock is consistent with tire rotation when driving. It gets consistently louder and harder hitting during a turn. Speed really doesn't seem to play a role in this. Driving straight make very little noise.
I parked it in the garage and disassembled the front left hub, pulled the axle shaft out, cleaned and inspected everything. I-joint has very little play but little play in deed. Bearings "seem" fine. All grease was a off dark green/ black. The hubs seemed great. The brake and rotor also is in great condition.
I'm on par to just replace the u-joint but looking for wisdom. Thanks!
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