vibration at 65-70
 

When i drive my 83 2wd c10, i get a vibration at roughly 65-70 mph, but when i drive 60 its fine and when i do 75 its fine. At first i thought it was the road, but now im not so sure. I cant remember if it did it with my other set of tires or not (just put new wheels/tires on the truck from another truck entirely). I went from cheapo passenger car tires to a decent set of lt tires, same size wheels 15x8 rallies. I know the rubber of my carrier bearing is going bad, and when i put it in gear i get a clunk (its an auto), but it almost feels like the front end is where the vibration is coming from and not the driveshaft. Also has new monroe gas magnums, so i know its not the shocks. Should i get the wheels balanced? they looked balanced but i didn't have them done and it was on my parts truck like they are on my own now. Or maybe an alignment issue? but I would think alignment would be a constant thing if it was off. Thoughts?

Re: vibration at 65-70
 

Sounds like u joints, especially with the clunk you described. I would replace that carrier bearing as well.
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Re: vibration at 65-70
 

could also be a belt broken in a tire. I would test out the tires. swap them and see if it goes away. At least that's the cheapest.

Re: vibration at 65-70
 

nope stop. take it back to where ever you got the tires from and have them re-balance your tires. (at no cost)

Re: vibration at 65-70
 

I don't think my dad will accept returns on the free set of wheels and tires I pulled off one of his parts trucks haha. Gonna talk to my buddies dad about balancing them for me. We have a tire machine but no balancer.
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Re: vibration at 65-70
 

Oh haha sorry about that
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Re: vibration at 65-70
 

alignments can cause vibrations too.

If you goto a tire store chain they usually will check alignments for free. it only costs if they do any fixin on it.

Re: vibration at 65-70
 

very true. a free alingment check. and they will do a quick check oh your ball joints,and tie rods

Re: vibration at 65-70
 

Normally tire problems start and get progressively more pronounced as you increase speed.

Compared to a tire, the driveline doesn't have as much mass to drive the disturbance. It can only generate that much energy at it's "resonant" point, so normally a driveline problem will have a "unsweet spot" were it's worse and then increasing the speed causes it to get better.

My vote based on what you've said: driveline.

K