12 bolt didferential gear ratio identification

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Jaycarter

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Location
Gloversville,NY 12078
First Name
J
Truck Year
1973
Truck Model
P10
Engine Size
6cylinder
My 1973 Chevy P10 has a 12 bolt, axle code stamping is : TBT W132 2

CAN ANYONE PLEASE DECODE THE GEAR RATIO FOR ME
 

Grit dog

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Auburn, Washington
First Name
Todd
Truck Year
1986, 1977
Truck Model
K20, C10
Engine Size
454, 350
Look like it has a 132:2 ratio. Decoding to 64:1. Lol
Kidding.
Presuming you don’t have a tach in it, or you could figure it out while driving with your phone gps and tire diameter. a 6 banger 1/2 ton van was not built to tow much of anything or haul a lot of weight, so original wouldn’t be too deep.
But it’s a 6er so may have a bit deeper than the tallest gears offered.
No tach, it’s easiest to count driveshaft revolutions.
Takes like 10 min including jacking it up. And no guessing needed.
 

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