Question about 1999 Chevrolet Tahoe

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2000 tahoe4x4 350 converter lock and unlocks all the time,trans rebuilt does same thing??? replaced tps sensor, no fault lights runs perfect other wise

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The lockup converter is controlled by a lockup solenoid. This is a must to get fixed. If you let it go it will burn up the torque convertor. When it's not is lockup it builds up a lot of heat. You may be able to take it back to the shop that did the work and tell them it still does it... if they aren't willing or if you did it yourself I would replace the lockup solenoid first. If you take off the oil pan there is a solenoid, it will have two wires going to it, located on the valve body. It will plug into a connector that goes through the case itself. Try this first. Try to catch the fluid in a clean drain pan, then you can re-use it. Just filter it through a fine paint strainer first. Most auto parts stores, that sell automotive paint, will give them to you for free. Don't tighten the bolts up too much on the pan, an oil soaked cork gasket tends to split VERY easy. Good luck. If you have any problems get back to me.

Posted on Nov 12, 2009

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It sounds like your torque converter is not unlocking. Best thing to do is take it to a transmission shop and have them hook it up to a tech 2 scanner and hope it's will have a DTC code in it's history. it's hard to say what is going on, it could be as simple as a oil and filter change due to the loose of transmission fluid line pressure from dirty filter, or a faulty TPS that sends signal to the ECM that will control the torque converter lockup solenoid and line pressure solenoid. Best thing to do and have it scanned since that is cheaper then and rebuilt transmission of something simple. Oh and check the transmission fluid for level and condition, it should be bright red, not dark like burgundy. Keep me posted, be glad to help you save some money. 

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