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03-05-2018, 12:31 PM | #1 |
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3.78 gears in 36 5 Window
Have installed 3.78 gears behind a 39 trans in the 36 5 Window.
What turtle gears should be used for correct speedometer reading? Thanks for any assistance.
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Marvin Fagan 214-697-8430 |
03-05-2018, 12:34 PM | #2 |
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Re: 3.78 gears in 36 5 Window
19 tooth
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03-05-2018, 12:45 PM | #3 |
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Re: 3.78 gears in 36 5 Window
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03-05-2018, 01:01 PM | #4 |
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Re: 3.78 gears in 36 5 Window
Where is a good place to look for one?
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Marvin Fagan 214-697-8430 |
03-05-2018, 01:14 PM | #5 |
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Re: 3.78 gears in 36 5 Window
Here's a starting place. Contact seller and ask if he has your number.
https://www.ebay.com/itm/1937-38-39-...FaTbB9&vxp=mtr Also, check out Fordbarn Swap meet section of parts for sale. |
03-05-2018, 01:41 PM | #6 |
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Re: 3.78 gears in 36 5 Window
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03-05-2018, 01:57 PM | #7 |
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Re: 3.78 gears in 36 5 Window
I have a #21 speedo drive gear in my collection of misc parts. Anyone have an idea what ratio it would be for?
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Bill.... 36 5 win cpe |
03-05-2018, 02:06 PM | #8 |
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Re: 3.78 gears in 36 5 Window
Look for one with a "wanted ad". I believe they are the same as late Model A, try Bratton's Ford Parts, (301) 829-9880. The "19" is correct but goes with the assumption you have stock 600-16 tires. There is a table on page 632 of the Green Bible.
Charlie Stephens |
03-05-2018, 02:17 PM | #9 |
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Re: 3.78 gears in 36 5 Window
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03-05-2018, 03:43 PM | #10 |
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Re: 3.78 gears in 36 5 Window
Tire size makes a difference also. ***I didn't see charlie posted that.
Here is the chart however. Last edited by Tinker; 03-05-2018 at 03:58 PM. |
03-06-2018, 12:11 PM | #11 |
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Re: 3.78 gears in 36 5 Window
A big thanks to 40cpe/Tinker for the info.. I had it in the back of my head that the unit was most likely for a 4.11 ratio.. I recall taking it out of a '37 pickup I restored in the early '60's. Interesting that the chart lists a #21 as being for 4.11 w/650x16 tires.
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Bill.... 36 5 win cpe |
03-06-2018, 12:19 PM | #12 |
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Re: 3.78 gears in 36 5 Window
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