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Mike Carver
Dodge Dakota
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4/28/2003
09:52:29
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 Subject: Problem
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Message:
Here's my problem: I just went up a tire size after a body lift, to 33s on my 4x4 Dakota, 3.9l engine. This weekend was the first time I had it out on the highway, and I was having a lot of difficulty getting up to higher speeds, and my odometer, and speedometer were off. How do I correct this?
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Chris
Dodge Dakota
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4/28/2003
09:55:37
| RE: Problem
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WHat year is the dakota? This dictates how tire RPM is measured (speed essentially.
I would have to say a gear swap is your best bet to correct all problems.
Anyone else have any input?
Chris
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Mike Carver
Dodge Dakota
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4/28/2003
10:26:17
| RE: Problem
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It's a 97. Isn't the computer supposed to reset itself to match up the proper gear ratio?
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Kowalski
Dodge Dakota
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4/28/2003
14:51:54
| RE: Problem
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Computer wouldn't know to reset itself. You might be able to have the dealer set things so the odometer & speedometer are close but this change in tires has the same effect as steeper gearing; the little 3.9 was already working hard enough. I think Chris is right on the money suggesting a gear change.
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Chris
Dodge Dakota
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4/28/2003
15:03:43
| RE: Problem
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If it is a 97 the computer reads tire speed (vehicle speed) at the output of the tranny (transfer case) so if you change gears so that the RPM is the same as it was before teh tire swap the computer will see no differences besides a slightly increased load. BUT if you are going to swap out gears you might as well go deeper than needed and actually gain some power back...
So go from 3.55 to 3.90 or so to get you back to normal (just an estimate, probably wrong) but if you go to 4:10 or 4.56 gears you will actually gain performance and mileage depending on your driving style.
Chris
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