Dana 300 Speedometer gear
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Dana 300 Speedometer gear
- Thread starter LASTCJ786
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tooth count is determinent on tire size and gear ratio 
LongHorn
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BusaDave9
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You tell us the tooth count on your speedometer gear. Then tell us how far off your speedometer is. If your speedometer is off by 6% then you need a speedometer gear with 6% more teeth (if your speedometer is too high).
All Dana 300 speedometer gears are compatible, it's just a matter of changing the teeth as a percentage of how far off your speedometer is.
CJ
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LongHorn
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I have a Dana 300 Transfer Case that came out of a 81' CJ5 I bought new.
It has a different tail-housing from all the other Dana 300 's I've seen.
I was under the impression it was a early CJ5 only part, but that's the way Jeeps are. Nothing is set in stone.
LongHorn
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P.A.T.C. Speed Shop
2134 B. East Texas St.
Bossier City, LA. 71111
888-201-2066
www. transmissioncenter.net
Call these guys that's where I got mine.
2134 B. East Texas St.
Bossier City, LA. 71111
888-201-2066
www. transmissioncenter.net
Call these guys that's where I got mine.
BusaDave9
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with both the Dana 300 and the Dana 20 the speedometer gear is in the rear tail housing. the Dana 300 gear looks like this:
check out this site:
Speedometer Gears for Dodge and Jeep, Gear . . . . .
The Dana 20 is much smaller and as you said all metal. It may have 11 teeth so each tooth makes a bigger difference.
You say you have 3.73 gears and 33 inch tires. You will need about 31 teeth on your speedometer gear. I have a chart for this. But don't take my word for it. The best and most accurate way to get the correct gear is to remove yours and count the teeth and find out how far off your speedometer is off.
You said "1980 Dana 300 's are by themselfs". I'm not sure what you mean. Maybe the previous owner of your jeep adjusted the speedometer by adding a speedometer calibration gearbox. This is a small device that goes between the speedometer cable and the tailhousing. It sticks out of the tailhousing and the speedometer cable plugs into it.
check out this site:
Speedometer Gears for Dodge and Jeep, Gear . . . . .
The Dana 20 is much smaller and as you said all metal. It may have 11 teeth so each tooth makes a bigger difference.
You say you have 3.73 gears and 33 inch tires. You will need about 31 teeth on your speedometer gear. I have a chart for this. But don't take my word for it. The best and most accurate way to get the correct gear is to remove yours and count the teeth and find out how far off your speedometer is off.
You said "1980 Dana 300 's are by themselfs". I'm not sure what you mean. Maybe the previous owner of your jeep adjusted the speedometer by adding a speedometer calibration gearbox. This is a small device that goes between the speedometer cable and the tailhousing. It sticks out of the tailhousing and the speedometer cable plugs into it.
LongHorn
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Is this the Dana 300 your talking about?
View attachment 3029
View attachment 3030
View attachment 3031
View attachment 3032
LongHorn
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So what happened?
Did we achieve resolution?
Did we achieve resolution?
LASTCJ786
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Yes That's it i found out The short housing 300 has the same speedo gears as a 1980 Scout. Next step find one.
BusaDave9
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Here's where you can get the speedometer gear:
Speedometer Gears for Dodge and Jeep, Gear . . . . .
Speedometer Gears for Dodge and Jeep, Gear . . . . .
LongHorn
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You'll need a thinwall deepwell socket to get it out 13 or 15/16 maybe.
View attachment 3048
View attachment 3049
LongHorn
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LASTCJ786
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Here's what I found out.
I pulled a Dana 20 gear 15 teeth 890206 steel (speedo cable drivers side)
I pulled my Dana 300 (scout) 13 teeth 890182 steel.(Speedo cable pass side)
Both speedo gears look the same . But the Jeep spins one way the Scout spins the other way.
Let me ask you this? Can I press off the Dana 20 gear flip it and put it back on . and then install it in my Scout Dana 300 ?
Yeah I know I smell the smoke. You have to think about this one.
I pulled a Dana 20 gear 15 teeth 890206 steel (speedo cable drivers side)
I pulled my Dana 300 (scout) 13 teeth 890182 steel.(Speedo cable pass side)
Both speedo gears look the same . But the Jeep spins one way the Scout spins the other way.
Let me ask you this? Can I press off the Dana 20 gear flip it and put it back on . and then install it in my Scout Dana 300 ?
Yeah I know I smell the smoke. You have to think about this one.
BusaDave9
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No. flipping the gear wont make any difference. Compare this to a threaded rod. Let's say the threaded rod has right hand threads. Then turn the rod around. Now would you have a threaded rod that has left hand threads? No. The thread wont' change.