I ordered mine from Bowtie Overdrives for $44.00. I told them my tire size and rear gears, and they sent me the speedo gear. I can count the teeth on mine and/ or identify the color for a reference, since it sounds like it might be the one you need. I have 3.73s and 27.82 tire dia.
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'69 Chev Cust/10 swb, 350/700R4, 5"/6"
'70 Chev C10 swb, 67 front, 454/700r4, 4"/5"
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'91 GMC 1500 Suburban 4x4, 350/700R4
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