What's the gearing in a stock '39 ford rear?

Rearend is out of a '39 2 door sedan...wondering what they came with from factory...

 

<TABLE id=HB_Mail_Container height="100&#37;" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"><TBODY><TR height="100%" UNSELECTABLE="on" width="100%"><TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">Not sure about the '39, but i have a '41 in my Hot Rod, and it's got 4:11's.
Adios-
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I have a 39 coupe and mine has a 3:73, or very close. I dont know it now, but there is a formula you can apply to the numbers on th banjo housing. Let me know if you would like that formula.

 

Yeah for sure, if you can dig up the formula that would be cool...Thanks.

 

I just put a '38 rear in my tank project and it was 3:78 .The numbers are stamped under the center housing. It may take some sand paper to get a clear reading .Ol Deuce

 

yeah just find those numbers on the front part of the banjo.
It'll be something like 9 37 (4.10) or 11 37 (3.78) usually but there are other possibilities.
Its the number of teeth on the ring and the n.o.t. on pinion.
Divide the numbers and you'll get the ratio.
TP

 

9/34 would be 3.78
could be 3.54 or 4.44 also
hard to say.....

people sometimes changed the gears too as quality replacements were available
your best bet is just to count!

Zach

 

If the rearend is complete ( and not stuck ) , Then just turn the drum one full turn ( 360 ) , and count how many times the pinion / driveshaft turned ( 360 ) when doing it ( One guy turning the drum , One guy watching the pinion ). If the pinion/driveshaft turnsa bit more than 4 full turns : Well then it`s probably a 4.11 . A bit or 2 less than 4 full turns : 3.78 . If pinion turns aprox 3 1/2 turns ? : 3,54
In other words : I agree with Zach : Count !
Klaz

 

Why do need a formula? The nubers on the bottom of the banjo housing are the number of teeth on the ring and pinion gear. Divide the larger number by the smaller one.

 

The banjo housing might tell the truth ... Or NOT ... Swaping gears without swaping gear housings ain`t all that uncommon in the wordl of Hot rodding ...
Klaz

 

Thanks...