banjo rear ratio question

i've been looking at banjo rears and trying to figure out the ratios in each one.

one is very obviously stamped 9-37. that's 4.11:1. no prob with that one. that's out of a '46 car.

one is an open drive pickup rear stamped either 8-34 or 9-34 (can't tell about the 8/9 for sure, but the 34 is definite). the logical conclusion is that it's 9-34 which is 3.78:1. i can live with that.

another is either 11-33, 11-36, 11-38, or 11-39 (this one is really hard to see). i can only guess that this one is 11-39, or 3.55:1. this one is also purported to be from a '46 car.

now the actual question: are there any other conclusions i could have drawn? are there other ring/pinion combinations that ford produced?

 

They are- 3.54 11/39
3.78 9/34
4.11 9/37
4.33 9/39
4.44 9/40
4.55 9/41
and there was also the 3.25 but I dont know what the count was on those, I think that was only '32 and older. The 4.33 was '33-'36 only. The 4.44/4.55 was '37-'40 V8-60s.

There'll be a test in the morning.

 

homer,

it's morning now. is it an open book test? better be, otherwise i'll fail.

anyway, thanx for the info.

 

And the '46 connection is worth remembering--the 3.54 was standard for a while in '46, then they went back to 3.78 as standard.

 

Esoteric and furrin banjo stuff:
I think the above pretty well covers Ford USA ratios, some of them very scarce (4.55 was generally for '41 four bangers!). I believe 3.23's were the highest, but were aftermarket only. Some lower ratios for short track use came from Getz Gears--I think they went to 4.88 and 5.12.
There actually was an aftermarket limited slip available--I have a partial reference to it from a sixties Honest Charley catalog--they left in a snippet on this vanished item when cutting and pasting stuff into their catalog copy. Hardware was available to fit axle housing ends to take full floating 3/4 ton type hubs and axles for racers.
England: I believe the English had some low ratio gears for the banjo different from those in this country. They used the V860 both before and after it was available here, and also kept the Model B engine in production for a long time. These engines were used in commercial applications where they needed all the gear they could get...
Also, HRM once mentioned an English Thames application (Ford truck) that used an offset banjo--two short sides from this thing gave an instant dragster rear end.
The Model A and B rear ends were both introduced with ratios slightly different from the well known ones used in most production. The very earl A's used a different pinion to driveshaft setup than later standard, too.

 

on all those ratios that had 9 teeth on the pinion gear: are these the same gear or were they unique to each combination?

 

Different gear. Also, Ford sold only matched sets. In my experience, these were held to VERY close tolerances, and installing real Ford gears, NOS or decent used ones, is very easy because they just go together correctly adjusted without messing around--as they must have had to on the assembly line. I've heard that the new ones available now require lots of adjusting, even at the pinion gear.