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Re: 4wd Weird Shake when Braking
shot in the dark here but have you checked u-joints or driveshafts for any binding in the slip joint? Any wheel interference with the axle hub? I believe the stock van wheels would have been hub piloted with 4.59" (116.7mm) center bore per google but I can't remember what the center bore of the stock 1982 wheels were. Have you rotated tires front to rear?
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'51 South Bend Model "9A"
'56 Chevy 3600 NAPCO
'74 Chevy Cheyenne Super K20-restored on 37's
'72 GMC Sierra Custom K2500- in progress
'08 GMC Envoy Denali
'12 GMC Sierra 2500HD Denali
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