05-12-2010, 05:33 PM | #1 |
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Join Date: May 2010
Location: Kent,oh.
Posts: 54
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Gear ratio
In my 46 I have a badly bent rear axle, I have another good complete rear end thar Iwant to use. How do I determine what ratio this rear is. The only stamp I could find was a faint 3and4 on the flat where the tube bolts to the pumkin. I have heard that by counting the number of turns on the u joint end to the actual axle turns you can do this. However I am brain dead and forgot how to do this. Any ideas. Dan
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05-12-2010, 05:54 PM | #2 |
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Join Date: May 2010
Location: St. Louis, MO
Posts: 89
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Re: Gear ratio
If you can read 34, there should be a 9 after it (34-9), or 34 teeth on the ring gear and 9 teeth on the pinion gear for a ratio of 3.78:1.
Other stampings / ratios would be: 39-9 / 4.33:1 39-11 / 3.54:1 34-9 / 3.78:1 37-9 / 4.11:1 |
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05-12-2010, 06:04 PM | #3 |
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Location: Mid coast Maine
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Re: Gear ratio
If you lock one wheel ,and turn the shaft and count the turns to make tire turn 2 times/or turn tire 2 times and count the turns on shaft.3 and 1/2 turns 3.54 more then 4 but less then 4 1/4 =4.11 that should get ya close.
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05-12-2010, 07:01 PM | #4 |
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Join Date: May 2010
Location: Kent,oh.
Posts: 54
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Re: Gear ratio
Thanks guys, This is amazing, Have a question and get a good answer in an hour. Great. Thanks guys and Fordbarn. Dan
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05-12-2010, 07:37 PM | #5 |
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Location: pittsfield, MA
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Re: Gear ratio
Just curious----------
How did the axle get badly bent? Thanks John |
05-13-2010, 07:45 AM | #6 |
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Join Date: May 2010
Location: Kent,oh.
Posts: 54
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Re: Gear ratio
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05-13-2010, 08:24 AM | #7 |
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Location: Atlanta area
Posts: 833
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Re: Gear ratio
I would check both axle assemblies closely as most 46 cars have a 3.54 ring gear and 47-48 have 3.78. If you want economy then the 3.54 is the one, if you want more "snappy" acceleration then go for the 3.78.
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05-13-2010, 09:10 AM | #8 |
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Join Date: May 2010
Location: Indiana
Posts: 494
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Re: Gear ratio
If you want to keep your ratio, I have an axle from 46/48. It's cheap plus shipping and I'm in IN. E-mail if interested
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