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What pattern?

Wheel?

Engine?

Intake?

Rear end?

We need just a little more info?
 

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6/5.5 or 5/5

GM used the 6 lug 5.5" pattern on 4wd after around 1971, but used 5 lug 5" on the 2wd model up until 1999 I think. The 5/5 was the same that was used on BOP, and Cadillac passenger vehicles.
 
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