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EFV-8 Club Forum / General Ford Discussion / Diff gears

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Discussion Topic: Diff gears -- page: 1 2

4ford

07-29-2012 @ 6:59 PM

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How can I really tell what gears are in my 1941 coupe? I think they are 4:11. And what would be a good gear to change to?

Thanks mike

deluxe40

07-29-2012 @ 8:30 PM

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Chock the front wheels, jack up the rear end so that only one wheel is off the ground and put the car in neutral. Then take the fill plug out of the rear end, clean off the edge of the gear tooth you can see and put a small drop of white house paint on it. Wait until the paint dries and then turn the raised wheel moving the ring gear while counting the teeth as they go by. You should get 37 for 4.11:1, 34 for 3.78:1 or 39 for 3.54:1. There are some other possibilities (e.g., 4.44:1, 3.25:1), but the first three are the most common in a '41.

Your choice depends a bit on driving conditions where you live. I prefer the 3:54 or the 3.25 for highway driving. My '41 Sedan Delivery has the 3.25 with a bone stock 221 inch flathead and it goes along just fine.

supereal

07-29-2012 @ 9:27 PM

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Look carefully on the bottom web on the rear end "banjo" for a set of numbers separated by a space or a hyphen. Divide one into the other to get the ratio. The gears could have been changed, but it is more likely they have not.

ford38v8

07-29-2012 @ 9:33 PM

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Mike, there are many ways to determine your ratio, but the one you got from deluxe40 is simple to do, and will quickly produce a positive answer.

A rartio of 3.78 is considered the best compromise between top cruising speed and getting off the line quickly. A lower ratio may also have you downshifting while going up mountain roads.

Alan

4ford

07-31-2012 @ 5:03 PM

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Supereal,
Are the numbers top or bottom. Can't seem to see anything

supereal

07-31-2012 @ 6:15 PM

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If they are present, they will be on the bottom, stamped on the web, usually close to the pinion end. They can be difficult to see because of age, rust, and grime. I use a Scotchbrite pad to clean up the area and not damage the numbers. Not all axles have them, but most do. My 47 has a 3-78, which is a good compromise between power and engine speed. In those days, 50-55 mph was usual. I have a three to one overdrive so I can run a hiway speeds.

4ford

08-02-2012 @ 5:54 AM

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Ok I will look. So what is the easiest way to change the gears ? Do you need to remove the whole rear end? Any tips before I began

Thanks.

supereal

08-02-2012 @ 7:10 AM

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Changing the rear end gears is an extensive process involving the complete disassembly of the unit. Both ring gear and pinion must by changed, of course, the pinion being considerably more involved, requiring heat and a press. Then, the gear lash is set by varying the thickness of the axle housing gaskets. It is a time consuming and often frustrating exercise, particularly if it is your first effort.

4ford

08-02-2012 @ 4:34 PM

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Ok well I assume the unit will come out. Take it away from the spring and pull the whole thing out . What a good time to clean everything up How will the drive shaft come away from the trans

Thanks again

4ford

08-08-2012 @ 8:37 AM

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Anyone in my area that I can take the whole assmy to and get the work done. Iam in Minnesota St Paul mpls.

I will take the rearend out and bring it to them any good shops??

Thanks.

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