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putiing a 81 ta diff w/disc already moved perches in to 69 specs what wheel offset do I need to use for proper clearance
 

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It depends on how wide your wheels are.

You will need to determine what back space works on a stock 69 for your wheel width, compare the width of the '81 rear to width of a stock '69 rear, then do a little math.

For example, if your '81 rear is 2 inches wider overall than a stock 69 rear, that's 1" per side, so you would need 1" more backspace on your wheels than what would work on a stock width '69 rear.

Offset and backspace are different. I'm only familiar with backspace.
 
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