I have a 1979 surburban 4x4 1500 sometimes while driving (Most of the
time lately) my truck suddenly jerks to the left then the right again
and again. A mechanic who did some front end work on my truck
recently(Pitman arm, and tie rod ends) said that sometimes older 4x4s
like mine will go in and out of four wheel drive because the Locking
hub ends are worn. Possible...likely?... email@example.com
I doubt it. If your hubs are that badly worn/beat, it's more likely they
wouldn't engage at all - even when you want them to. There's something
dangerously wrong with your truck. Bring it to someone who knows what
they're doing because I have serious doubts about your mechanic if he
gave you a line like that.
- Jeff G
It's possible that your brake shoe retaining springs are broken in the
rear drums. If they are, the leading edge of the brake shoe can 'drop'
onto the drum while driving and practically lock it up. Sometimes they
release all by themselves and other times you'll have to back up to
unlock the wheel. Rear brakes can whip you around pretty good too. Have
a good look at them. If you have a 1500, you should be able to pop the
drums off easily, 2500 & up are a lot tougher because you have to
actually pull the axles to service the rear brakes (VERY beefy axles in
those 3/4 & 1+ ton GMC/Chevs). I had a 77 GMC Suburban 2500 heavy 3/4
ton (very heavy), so I know how tough they are. It went over 330k and
still ran pretty good when I sold it. It's well worth fixing, those are
great old trucks and you can get new sheet metal for them all over the
place if it's suffering from rust.
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