identification help on a 1961 F100 rear differential

chisum5013 · Post by **chisum5013** » Thu Sep 19, 2013 8:34 pm

Can someone help me identify the type and specs on this tag that was on the rear end of a 1961 f100 with a 223 six cylinder engine. Please see attached photo Also, what kind of fluid do I use in it? Thanks for your help in advance.

Donnie · Post by **Donnie** » Fri Sep 20, 2013 6:57 pm

My photo isn't clear, but I think that it reads C1TZ>>>>>>> that indicates that it is a 1961 ......the 3:70 is the rear end ratio..
I would think that 90 weight gear oel is OK to use.......other opinions may follow......Donnie

ultraranger · Post by **ultraranger** » Fri Sep 20, 2013 8:58 pm

Donnie wrote:My photo isn't clear, but I think that it reads C1TZ>>>>>>> that indicates that it is a 1961 ......the 3:70 is the rear end ratio..
I would think that 90 weight gear oel is OK to use.......other opinions may follow......Donnie

Yep. This same topic had also been posted in the General Discussion section, which is where I had made my replies to it yesterday.

http://fordification.com/forum/viewtopi ... =2&t=73233

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identification help on a 1961 F100 rear differential

identification help on a 1961 F100 rear differential

Re: identification help on a 1961 F100 rear differential

Re: identification help on a 1961 F100 rear differential