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Parts Needed; Speedo Drive Gear
Topic Started: Sep 23 2015, 01:34 PM (586 Views)
fredcc
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Needed speedo drive gear for a 1964 DJ3A T96 trans and 4:10 rear axel.
Don't know how many teeth or where to start looking.
1965 DJ3 CONVERTIBLE In work
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ba25
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Fred
WO 644463 17 tooth gear, shows up as the only one used in the DJ3A, and also used in some early DJ5, DJ6, w/t96 trans

the 4.10 rear axle only shows up once in all parts & service material, in the 62 service standards.
parts lists from 55-65 show model 23 and 27s w/ 4.56, but all show using the 17 tooth 644463 gear

Posted Image[/IMG]
BA Agan

46 Bantam T3-C 2953
46 Bantam T3-C 19638 "Big Red"
49 CJ-2A 222564
51 M38 MC 28115
52 M100 285896
62 CJ5 57548-148683
64 DJ3A 8204-24210
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SteveK
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Quote:
 
Needed speedo drive gear for a 1964 DJ3A T96 trans and 4:10 rear axel.


Fred, you're saying "drive gear", and technically that is the larger gear on the 'output shaft' inside the transmission. The one accessible from outside the transmission at the end of the speedo cable is called the "driven gear". It is important to note the difference if you are ordering parts, especially if you don't have part numbers or correct number of teeth to reference. Bruce has given you the stock "driven gear" number of teeth at 17. I have seen a 19 tooth gear as well from a 50 Jeepster transmission, but I don't know what final gear ratio it had for it.

The chart also shows the "drive gear" as 5. These are a 'set' for the 4.56 rear gear ratio...but...you are saying you have a 4.10 (????). Do you have the stock D23 rear axle housing, or a replacement? How did you determine you have a 4.10? I don't see a 4.10 referenced on the chart. You can notice that the larger the Axle Ratio number, the larger the "driven gear" number with the same 5 tooth "drive gear". Note too, there are 4, 5, and 6 tooth "drive gears" shown for various combinations. I'm going to 'guess' that for a 4.10 with a 5 tooth 'drive gear', you're looking for a 17 tooth 'driven gear'.

Also, if you have oversized (taller diameter) tires, that will change the number of teeth needed (less) to accurately read the MPH and miles on the speedometer. It all works together.

You may want to try to Google at the top of this site for previous conversations and references made there. I referenced a site there where some formulas are available, as well as it is a good start location for your hunt to begin. I'm pretty sure Charles, and me too, have found that some Ford speedo drive gears are a match, and may have more ratios available for your 4.10. I can't remember what year Fords it was, but most likely in the 50-60 years is my best guess right now.

Happy Hunting!

SteveK
62 Dispatcher
South Florida
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ba25
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this is the only reference to the 4.10:1 rear end....62 jeep service standards
not found in any service or parts manuals.
I do have a 18 tooth gear that came out of a T96 from a 2wd SW/Utility.
You know maybe they misprinted the FJ-3A ratio with the DJ-3A ratio, it wouldnt be the first time that misprint was found?

Posted Image
BA Agan

46 Bantam T3-C 2953
46 Bantam T3-C 19638 "Big Red"
49 CJ-2A 222564
51 M38 MC 28115
52 M100 285896
62 CJ5 57548-148683
64 DJ3A 8204-24210
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PapaC
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Edited
Charles Tate....North Mississippi

1956 WILLYS DJ3A Convertible
Doing ground up nuts and bolt restoration by almost entirely reconditioning original used or a few NOS DJ3A parts.

1962 WILLYS DJ3A Convertible. (For research and parts only)
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ba25
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17 tooth gear has 448174 stamped around shaft
18 tooth has 448315 stamped on shaft
315 is in middle of the three gears


Posted Image

Posted Image

Posted Image
Posted Image
BA Agan

46 Bantam T3-C 2953
46 Bantam T3-C 19638 "Big Red"
49 CJ-2A 222564
51 M38 MC 28115
52 M100 285896
62 CJ5 57548-148683
64 DJ3A 8204-24210
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fredcc
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First thing Guy's thanks for all the info.
Now to make some corrections on my post axel ratio tag says 4:10,
Drive gear teeth ?
Driven gear 15 teeth
The speedometer read fast till the gear striped .
Will try to get tooth count on the drive gear and confirm axel ratio
today if weather permits.

Fred
1965 DJ3 CONVERTIBLE In work
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SteveK
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Fred, What year is your Dj? if it is tagged 4.10 then it probably is. Bruce's chart calls for the 4.10 on a Spicer 27 rear end, while I believe most DJs used Spicer 23s. Mine has the "23" casting on the housing to the lower right of the drain plug and cover, so maybe you can verify that first. Your 4.10 would be easier on gas and RPMs for engine life, and probably very rare on a Dj.

Another easier way to check the approximate ratio without the mess is... With the trans in neutral and the front wheels blocked, Jack up one rear tire keeping the other stopped from spinning. Better if you have a helper, but if alone, mark the driveshaft where you can see it clearly from the position of turning the free tire. I mark the tire in the bottom position for ease in determining ONE revolution. Have your helper turn the tire slow and steady and count the revolutions the driveshaft makes with ONE revolution of the tire. The driveshaft should turn just barely more than 4 times with your ratio (4.5 times with a 4.56). If results are majorly different, you may want to count the ring and pinion teeth and do the math for accuracy.

On Bruce's chart, all 15 tooth gears combine with FOUR-tooth drive gears for 5.38 ratio. Also note, the 18-tooth gear and 5-tooth driven, has a 'note' of "requiring an adapter part number 911240"(what ever that is?), and is also for 5.38 ratio. No wonder yours read fast, and stripped. I hope your drive gear is not damaged too. With the trans in the Jeep, that will be hard to see and/or count. Let us know what you find. Good Luck!
SteveK
62 Dispatcher
South Florida
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fredcc
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DJ3A Built 20 Oct 1964 Info tx To Colin
4:10 axel ratio confirmed
4 tooth drive gear
215 R70/14 tires
What tooth driven gear ???
I'm thinking 18/ 20
1965 DJ3 CONVERTIBLE In work
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SteveK
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Spin your wheels on these...

http://www.tciauto.com/tc/speedometer-gear-calculator/

http://www.quadratec.com/jeep_knowledgebase/article-46.htm

http://tire-size-conversion.com/gear-ratio-calculator/
SteveK
62 Dispatcher
South Florida
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