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93superdak
Dodge Dakota
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3/11/2005
19:17:34
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 Subject: 4.10 and speedometer
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Message:
I recently installed 4.10 rear gears and my speedo is way off now. What can I do to get my speedo corrected??
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.boB
Dodge Dakota
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3/11/2005
19:42:37
| RE: 4.10 and speedometer
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That's not a stock ratio, so there's no driven gear replacement. You'll have to reprogram the computer.
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Crow318
Dodge Dakota
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3/11/2005
20:33:41
| RE: 4.10 and speedometer
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.bob jumped to conclusions. Did you also switch tires? Because if you have 32's, you can get the spedo gear for the 3.55 and 215/75 R15 setup. They are the exact same. And with 33's the 3.55 and 235/75 R15 setup will get you close enough.
If not, go to your dealer and ask what the # of teeth on the spedo gear for the 3.55 rearend and 235/75R15 and then ask for the 3.92 gears with the same tire size. Then do a little math to figure the # of teeth you would need for the 4.1's
I recently changed tires and the dealer had a listing for my setup. When I was changing the spedo gear, I was looking at the gear houseing, and it can accomidate quite a few different gear sizes. I'm sure the one you need will be available.
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93superdak
Dodge Dakota
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3/11/2005
21:04:44
| RE: 4.10 and speedometer
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I have a 2WD - 29" 235/75 R15 tires are as big as I can get w/o rubbing the fronts in a turn (they rub a little now) so getting larger tires wont work for me. I'll do some phone callin and some math - wouldnt the 3.92 speedo tranny teeth be fairly close to what I'd need anyway. My sticker inside the door says stock wheel size for my '93 2WD is a meeger P195/75R15. Can ya believe that?
THX for the help!!!
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T-racy
Dodge Dakota
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3/12/2005
00:38:30
| RE: 4.10 and speedometer
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Message:
The speedo pinion for the 3.92 should be close since you have bigger tires. At least it's gonna be alot better than you have now.
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nick
Dodge Dakota
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3/14/2005
10:03:19
| RE: 4.10 and speedometer
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i have 4.10's in my truck and my speedo is fine it is only when you switch tire height that you neeed to adjust your speedo.
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93superdak
Dodge Dakota
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3/14/2005
10:26:30
| RE: 4.10 and speedometer
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nick-
Did you have 3.92 stock? I can see your speedo being close to no change with a change of 3.92 to 4.10. What is your year of truck? I have a genll ('93) went from 3.55 to 4.10 and like I said earlier - there is a definate change in my speedo - You like them 4.10's dont ya!!
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Crow318
Dodge Dakota
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3/14/2005
12:02:04
| RE: 4.10 and speedometer
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On the '98 and newer truck the spedo uses a wheel sensor, so you can change gears without changing the spedometer reading
For the '93, the sensor is before the rearend, and therefor any change gearing or tires requires a new spedo gear
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93superdak
Dodge Dakota
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3/14/2005
20:50:08
| RE: 4.10 and speedometer
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I also noticed in overdrive (auto) that my tach and speedo read the same as it did before I changed the rear end. Roughly 2200 RPM is 70 MPH whether I had 3.55 or 4.10. Got me wondering how my '93 actually works.
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nick
Dodge Dakota
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3/15/2005
08:20:24
| RE: 4.10 and speedometer
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Message:
I had 3.55 before I changed to 4.10.
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Crow318
Dodge Dakota
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3/15/2005
09:11:56
| RE: 4.10 and speedometer
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Message:
93superdak,
After you installed the gears, when your spedometer said 70, you were actually only going 61.
old was 2200 @ 70
new was 2200 @ 61
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93superdak
Dodge Dakota
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3/15/2005
11:15:59
| RE: 4.10 and speedometer
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thx Crow318-
I dont like guessing what speed I'm doin - cops like writing tickets around here. So what do ya think my speedo reads when I'm actually doin 70?
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billyboy
Dodge Dakota
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3/15/2005
13:00:47
|  RE: 4.10 and speedometer
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Message:
http://www.cprparts.com/HPcalculator.html or http://www.csgnetwork.com/automotiveconverters.html
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nick
Dodge Dakota
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3/15/2005
13:08:33
| RE: 4.10 and speedometer
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Message:
http://www.csgnetwork.com/rearendgearcalc.html
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Jazlynn
Dodge Dakota
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12/14/2011
00:59:33
| UjBuyXHjip
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We've airvred at the end of the line and I have what I need!
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