Rear axle ratio Ford 1947 QUESTION!

The numbers stamped on the bottom of the bell housing won't tell you the ratio if the gears were changed unless someone restamped it. The easy way to check the ratio is put a vice grip on the drive shaft pointing up at 12 o'clock. Mark the tires or drum with chalk at the bottom. Roll the wheels forward one complete turn counting the turns of the vice grip. 4 turns = 4:11, 3 3/4 turns = 3:78 and 3 1/2 turns = 3:54. In the car mark the tires, mark the crankshaft pulley, put in HIGH gear and push the car to move the tire ONE turn watching the mark on the pulley. Same number of turns as the vice grips tell the ratio. G.M.
 
G.M. said:
The numbers stamped on the bottom of the bell housing won't tell you the ratio if the gears were changed unless someone restamped it. The easy way to check the ratio is put a vice grip on the drive shaft pointing up at 12 o'clock. Mark the tires or drum with chalk at the bottom. Roll the wheels forward one complete turn counting the turns of the vice grip. 4 turns = 4:11, 3 3/4 turns = 3:78 and 3 1/2 turns = 3:54. In the car mark the tires, mark the crankshaft pulley, put in HIGH gear and push the car to move the tire ONE turn watching the mark on the pulley. Same number of turns as the vice grips tell the ratio. G.M.
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Mart said:
Just buy it, for that price it's worth it just for spares.

I put a little video on youtube showing how you can check the axle ratio.

http://youtu.be/bkvp3Fq21ZM

Mart.
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Dear Friends!

Here I put a video testing axle ratio check "differential" teached by Mart and G.M from FordBarn.

http://www.youtube.com/watch?v=OfWXtT0o0Lw

As you can see the result is 3 3/4 turns so the ratio is 3:78.
Am I right with this check? please correct me.

Thank for your answers

Harylufa
 
That's great, Hary.

If the opposite hub did not turn, that is indeed a 3.78 ratio.

Thanks for the "Name check"!

Mart.
 
A little late to this conversation but thought I'd add that my 1947 Ford model 79A 5 passenger Sedan Coupe was built in June 1947 and has its stock 3.54 spiral bevel diff with factory shock brackets using tube shocks.
 
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