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Old 10-25-2011, 04:45 PM
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Torque converter lockup question

According to my Edge insight, my torque converter only locks up when in 5th gear. I was under the impression in tow/haul mode your converter is locked up all the time in all gears. It does not matter if i am in tow mode or not, WOT or just putt putt mode, I can only get the converter to lock in 5th gear. truck is 2003 6.0 with torqueshift transmission.
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Old 10-30-2011, 07:16 AM
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When I am loaded heavy I have trouble keeping the TC locked as well. I am not very happy with that.

Given the year of your truck, possibly an upgraded trans strategy or a custom tune my improve your situation.
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Old 10-31-2011, 03:24 PM
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I have just recently been informed that it depends on which strategy is loadedon my trucks computer weather or not your TC locks up in all gears or just 5th. Even when I am loaded very heavy (20,000 plus) it still wont lock unless i am in 5th gear.
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Old 10-31-2011, 04:55 PM
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I don't understand that programming. When the TC is unlocked (SLIPPING!) that is when the transmission builds heat, my mileage goes in the dumper, and with increased RPM the EGT's go up. Somebody tell me why I want the TC to be slipping?
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Old 11-01-2011, 03:14 PM
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As far as heat buildup is related, the hottest I have ever seen my trans fluid was maybe 170 - 175 degrees and that was pulling our 10k 5th wheel across kansas heat at the end of august. As far as EGTs are concerned I have no idea as I dont have the probe installed to moniter them.

Also forgot to mention that my pcm was updated about a year and a half to two years ago. I have no idea what it was doing prior to the update....
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Old 11-06-2011, 04:38 AM
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I can't remember my strategy right now, but in tow/haul mode my tranny will go 1-2-3-4-4L-5L. In normal mode it's 1-2-3-4-5-5L.

Even towing heavy (10k trailer) it will follow this and stay locked pretty well.
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