Rear Diff Question

I have a 1991 GMC C1500, Extended Cad, Long box with a 350 TBI in it. It has a 10 bolt 8.5" rear end with a 3.08 rear ratio which I am looking to switch out for a 3.73 for towing. My question is - Can anyone tell me if this has a 3 series carrier in it?

Thanks in advance Kevin

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KV
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