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Re: What gears do I have?
Just based on your SPID, it should have come with 4.10's from the factory. You can confirm by pulling the cover and checking the numbers stamped in the ring gear but the SPID is all we have to work off of.
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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
'17 GMC Yukon XL
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