12 bolt didferential gear ratio identification

[Jaycarter]

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]

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.

 

[SquareRoot]

AND STOP YELLING!

 

[Ricko1966]

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.

You don't even have to jack it up put a chalk mark at 6 o'clock on the tire and a chalk mark at nine o'clock on the driveshaft push the truck slowly forward. Look at the drive shaft every 1/4 turn of the tire. If you don't trust watching the drive shaft tape a piece of string to the driveshaft,and count the wraps of string after 1 wheel rotation,use a little common sense for difference,noting where your tape is for anything less than a complete turn of the driveshaft. 2 chalk marks 1 slow push less than 2 minutes. And this eliminates any confusion about rotation counting with a posi.

 

[RetroC10Sport]

If it hasn't been changed, it's a 4:11 non locking.