The correct way to go about it is to buy the tires and wheels you want to run. Set them in place to fit inside your bedsides and then measure wheel center to wheel center. This is your WMS to WMS of your differential. To determine your housing width, you will need to decide on what brake offset (GM or Ford) you want and which housing ends (GM or Ford). And also whether you will be running drum brakes or discs.
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Originally Posted by 19671972C10
K. Yea I've been wondering about measurement for when I build 9inch. I got I about figured.
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