1992 Chev Suburban Malfunction - Drive Train & Driveline


Question: When accelerating the automatic transmission will not shift from second to third until the tach is at 4000 rpms. The shift from third to forth is normal then it won't shift into OD. I've changed the fluid and filter. The fluid looked fine it was still red and didn't smell burnt at all.

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Technican: Have the electronic shift modulator checked.I believe AAMCO provides a free estimate and diagnosis.If the fluid was clean, Its kind of hard to believe clutch plates or torque converter are the problem but its possible.There also could be a slight obstruction in the valve body thats not allowing proper shift pressure. Paul
Owner: The problem is I'm living in Germany now and we don't have any local AAMCO's around and work on American made vehicles is expensive. I don't beleive my transmission has and electronic shift modulator, I believe it shifts via a cable hooked to the carb. Any other sugestions?
Technican: Whether eletronic or mechanical, your vehicle does have a shift modulator.Was not aware you are out of country but I'm sorry to say that if it is a modulation problem, a transmission specialist would most likely be who you need to see. Paul

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