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Electrical 2nd Gen Dodge Ram Electrical Problems and Questions.


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Old 05-05-2010, 08:45 AM
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Default What OBD do I have - '96 1500, speedo recalibrate.

I wasn't really sure where to put this, general seemed to be the best...anyways, I have a '96 1500 with the 5.2L, and 4.88 gears with 33s. Needless to say, my speedometer is WAY off...when my GPS says I'm doing 65, the speedo reads 85-90. Obviously it needs to be recalibrated, and that's where my confusion begins.

This is the first time I've had a relatively modern 4x4 truck modified this far. Everything else has been 1980 or older, and those are easy - just change the speedo drive gear in the transfer case.

I started looking around, and it sounds like I just need to reprogram the ECU to account for the tire/gear change, and I don't need to change/can't change the speedo drive in the t-case. It's also my understanding that as of '96, all passenger vehicles sold in the US needed to comply with OBD-II standards, but looking at the various programmers out there, they all seem to start with '97 for support of the Rams. Do I actually have an OBD-I system in mine? Do I have a drive gear in the t-case that I can change, or does it actually have to be done in the computer? Is '96 just a weird year? Can I just reflash my existing computer? I have played with some of the GM OBD-I systems, and reprogramming the EEPROM chips in those systems (I used to drag race S10s), will I be looking at the same thing with my Ram?

Like I said..I'm completely confused on this one.
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Old 05-05-2010, 09:58 AM
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Yes, you have OBDII. I'm not sure what can be done to make the speedo accurate with such steep gears. I know the DRBIII can't accomodate that particular combination in the pinion factor setup.
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Old 05-05-2010, 04:15 PM
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Quote:
Originally Posted by Remerson228 View Post
Yes, you have OBDII. I'm not sure what can be done to make the speedo accurate with such steep gears. I know the DRBIII can't accomodate that particular combination in the pinion factor setup.
Even getting it closer would be better.
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