Technical Help decoding ford 9in tag

I've searched all over the net to try to figure out what the numbers mean on this id tag . The rearend is out of my 63 ford p/u. I assume the 3.89 is the gear ratio, but not positive . If anyone can point me in the right direction I would greatly appreciate it.



Posted using the Full Custom H.A.M.B. App!

 

3.89 gear ratio and not posi

 

Yes, 3:89 ratio. IF it were a locker it would display 3 L 89

 

C3TA is the ford code for 1963 Ford Truck

C = 1960s decade
3 = 3rd year
T = Truck

 

Thanks fellas !! Just wondering how this gear ratio would do with a 300 inline 6 with a c4 or aod .


Posted using the Full Custom H.A.M.B. App!

 

It would be a lot more highway friendly with the AOD

 

Try here

http://www.fordification.com/tech/rearends_ford01.htm