The GMC CCKW

I have a winch that ive been told its a 20ton but i dont know for sure?

heres the numbers if anyone is a wizz at this and could hel me I.D.
Garwood detriot
12y4524
Model 5M723-B-B
SERIAL A-244651

Thats all i could read off it, the winch works well and could pull a jumbo jet!

Brad

Looks like a 40,000lb winch off of a Diamond T 980, m19 tank transporter.

You might want to check into this thread on G503.com/forums

http://www.g503.com/forums/viewtopic.php?f=26&t=180739