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Old 08-20-2006, 11:49 AM   #1
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Default Transmission Gear ratios and the PCM

If the PCM is programmed for the wrong gear ratio what kind of problem would I see if any? Also how do I tell what gear ratio I have just by looking at the tranny. I did a swap and I don't really know what it came with and I can't remember what the PCM was programmed for. It has been shifting a little funny and I was wondering if this would cause the problem or not.
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Old 08-20-2006, 12:42 PM   #2
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you said your trans was out of a SC GTP Correct???

you should have the 2.93 for 4T65E(HD) or the 3.29'* that were optional in some of the GTP'*.....your SLE came stock with a 3.05 ratio

did you use your stock PCM or did you use one out of a Bonne or the GTP?
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Old 08-20-2006, 05:03 PM   #3
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You know, The closer I looked at the engine I think that it came out of a Buick Regal */C. I had a PCM programmed from Intense, but I don't remember what the gear ratio was programmed for.
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Old 08-25-2006, 02:25 PM   #4
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The PCM would have been coded for your VIN and your stock gear ratio (unless you asked for something else). An incorrect setting would set a 730 (incorrect gear ratio) code and cause the car to command maximum line pressure resulting in VERY hard shifts and burned up clutches within about a week.
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