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Old 04-22-2002, 08:02 PM
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Post 97 gmc p.u. shifts?

a buddy of mine has a 97 gmc p.u., v8, auto. he puts it into low, pulling a trailer, it shifts into second at 3500 rpm without moving the shifter. he thinks it's messed up, ready to go to the shop with it. i say it's probably normal, an idiot proofing built into the system. anyubody know the answer, maybe i can save hima few bucks.

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Old 04-23-2002, 10:44 AM
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I beleive you are right. The older transmissions could be trapped in a gear but any of the newer ones i have tried all shift regardless, but usually it shifts at a point where it absolutely has to . I have seen cars that normally wouldnt chirp tires from first to second ,chirp them when it is trapped and let the "idiot proofing" take over. The extra load of pulling a trailer may just make it shift at an lower rpm,not sure. He could try this with no trailer and see if it still shifts at 3500 rpm. Usually with no load (depending on the vehicle also ) it should go to @ the redline and hold that for a second, usually you feel as if it is not pulling anymore. Hang on because when it shifts it sometimes is a pretty violent shift, and this is not really recommended, i would imagine it is not really that good for it.I have a buddy that runs a trans shop , next time i see him i'll ask. Hope this helps.
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Old 04-23-2002, 06:28 PM
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The last transmissions to hold a gear regardless of rpm were the Ford Selectshift transmissions, FMX C4, C6. I don't think any other trannies do this anymore. A shame because I think this is a good feature, I used to hold my old 68 Galaxy in second gear if I got stuck in the snow because the 428 would just spin the tires otherwise. Oh well chalk it up to progress and put this "old" idea in with all the others like the swing out quarter window, the suitcase sized ashtray, the full sized spare tire, the roll down rear window, fender mounted turn signal flashers, flat rear seats, rear passenger cigar lighters.....I could go on and on. Jeez, I feel depressed now. Maybe we should write a letter to the big three and get these options back.
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Old 04-23-2002, 09:08 PM
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Hay just tell him to buy a after market computer chip and it will fix it. It is a electrical shift trans and just protects itself. ROY
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Old 04-23-2002, 11:13 PM
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thanks guys, i'll pass this info on to him. i'm a bit ignorant on the computer and electronic gizmos, i try to keep up with thje tech articles but it seems things change with every model year.
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