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Old 06-25-2005, 10:45 PM
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tranny tune-up and electronic speedo correction

I have a 93 gmc 1/2 ton 2wd with a 350, overdrive and 3:55 gears. I bought a 5th wheel RV to pull. The truck is in great shape but it's got high mileage and the original overdrive transmision. It has a medium sized aftermarket tranny cooler. I'm going to change the tranny fluid and filter and I'm wondering if there's any other preventative maintanace I should do to ensure I don't have trouble when towing. What about some kind of additive?

Also, I'm planning to swap out the rearend for another with 3:73 gears for better towing. How do I correct the speedo?

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Old 06-26-2005, 10:30 AM
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I beleive the 1993 truck has a chip on the back of the speed-O head that must be altered to correct the reading. This usually requires a visit to a speed-O shop




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Originally Posted by murrsue
I have a 93 gmc 1/2 ton 2wd with a 350, overdrive and 3:55 gears. I bought a 5th wheel RV to pull. The truck is in great shape but it's got high mileage and the original overdrive transmision. It has a medium sized aftermarket tranny cooler. I'm going to change the tranny fluid and filter and I'm wondering if there's any other preventative maintanace I should do to ensure I don't have trouble when towing. What about some kind of additive?

Also, I'm planning to swap out the rearend for another with 3:73 gears for better towing. How do I correct the speedo?
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Old 06-27-2005, 10:15 AM
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speedo correction electronic speedo

I called the GM dealer and was told that I would have to correct it at the transmission (mechanically) and the kit costs $168.95CDN. I have no idea what's involved with installing the kit so I'm starting to think I might have to abandon the gear ratio change for now, it's adding up to too much $.
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