Bill, there is a tag in the cab above the fuel tank which reads:

"NoSPIN Differential
for greater traction, safety and economy
NoSPINS positively rotate all driven wheels under power
WARNING"
...
"Detroit Automotive Products Corporation
Model # KS10"

The differential is a 10-bolt round pattern. How can I tell if it is an Eaton, Spicer, etc...?

Oh, and the other reason I think it is posi, or locker, or something similar, is at low speeds it turns like something with tracks - a tank maybe?? hehehe

If a tranny swap is the best option, what years would bolt up well?

Last edited by Husker; 06/05/2011 6:55 PM.