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Wrong tires

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Old Jun 24, 2024 | 04:17 PM
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Default Wrong tires

Bought 1981 used. Had bigger tires on the back, although tires SHOULD HAVE been the same size. Whoops previous owner.
Switched back to stock tires, but there's something off- it CLUNKS.
Jacking it up...
Where should I look first?
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Old Jun 24, 2024 | 04:29 PM
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Well, at everything. You could get more in detail about the clunk. Like when does it clunk, etc. But there are a few things to look for under there. Probably start with the U joints.
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Old Jun 24, 2024 | 04:30 PM
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Did it clunk with the old tires on? When is the clunk heard? Remember, with the car jacked up you shouldn't spin the wheels as the half-shaft angle is too acute.
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Old Jun 24, 2024 | 05:00 PM
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They don't necessarily need to be all the same size - who told you that!

What exactly does bigger mean? Taller/Wider/Both?



What size was on there before?


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Old Jun 24, 2024 | 05:47 PM
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It could need a fluid change in the differential with the proper GM posi additive
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Old Jun 24, 2024 | 06:05 PM
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Originally Posted by tankgirl
Bought 1981 used. Had bigger tires on the back, although tires SHOULD HAVE been the same size. Whoops previous owner.
Switched back to stock tires, but there's something off- it CLUNKS.
Jacking it up...
Where should I look first?
If it's an automatic and it clunks going into gear, the rubber pinion snubber bushings are worn.
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Old Jun 24, 2024 | 07:05 PM
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What size is "stock"?

I'd suspect that something other than tires is the issue.
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Old Jun 24, 2024 | 07:33 PM
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Tire size is personal preference,
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