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A way of a practical check without pulling the cover is just listing what you have for a motor and tranny combination.. if the glove box sticker is still there and does not list any option gear ratio changes then you basically have the standard equipment ratio.
I'll guess if you have a 69 3/4 ton you have 4.57 if its 1/2 ton then 3.73 ratio.
Standard equipment changed depending on the motor you originally had with the truck. Being higher ratios were usually used in lower powered trucks.....6 cyl typically used higher ratio.
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70 3/4 ton GMC Suburban 4x4 250/4 spd.
71 1/2 ton Suburban Chevy 4x4, 350/350
72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane
2005 FLSTSCI Harley Springer
85 FXSB Harley Lowrider
72 Triumph 650 Bonneville 5spd
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