'96 f350 tranny slipping, cruise control? - Diesel Forum - TheDieselStop.com
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Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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Old 09-06-2011, 07:47 PM   #1 (permalink)
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'96 f350 tranny slipping, cruise control?

My '96 F350's transmission did a weird thing today. I was cruising hyway speed when the cruise control suddenly disengaged. Repeated attemps to reset had no effect. Then, when I got off and came to a stop light, when I started and hit 3rd the transmission had trouble engaging. I gingerly eased up and it caught and I made it to my destination. I checked the fluid level and it was full and clear.Later , I started it up and problem gone. The cruise control also began to work again. Seems like a strange coincidence, but I was wondering what the community here thought. Can these two things be related somehow, and by turning it off and back on it somehow reset itself ? This is the second time it has happened. It did the same thing transmission wise two weeks ago as I left the house and I turned right around and came home, checked the fluid and turned it off. When I restarted it, it worked fine until this last incident.I don't know if the cruise control worked or not as I never engaged it the first time.
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Old 09-06-2011, 09:15 PM   #2 (permalink)
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Welcome to The Diesel Stop. Our transmission guy, Mark Kovalsky should be around shortly to help you out.
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Old 09-06-2011, 09:53 PM   #3 (permalink)
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When it does it again, pull up on the parking brake with your left foot and try it again. Mine was the switch. Otherwise it's prolly in your brake light circut. Torque convertor lockup is controlled in this circuit also. That would explain the weird shift also as lock-up is around when it normally shifts to third, depending on your speed. Check all the bulbs first. By the way, welcome to the forum from an infrequent poster. Learn how to use the search function. Lots of good info on here.
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Old 09-06-2011, 10:22 PM   #4 (permalink)
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I think they are related. There is something electrical causing this problem. As to exactly what it is, I can't tell from here. If you have access to a high end scan tool you can watch what the PCM is doing to help troubleshoot.
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Old 09-07-2011, 07:27 AM   #5 (permalink)
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Thanks for the quick replies and warm welcome. I'll check out the replies and get back.
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Old 09-07-2011, 08:20 PM   #6 (permalink)
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mine slips out if the tranny gets to hot, like it did when i was cruising at 80mph for an hour in the summer after 6 hrs on the road.
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Old 09-07-2011, 11:10 PM   #7 (permalink)
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Check the center high stop light on the cab roof.
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Old 09-08-2011, 07:28 AM   #8 (permalink)
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My trans was about 155 F when this occured the second time. The first time it was cold. All brakes lights, including the center top are working. I took it to a mechanic yesterday to read codes and he got miffed when it read 124 codes and found that it has an aftermarket programer which screws up the reading. He told me to get it stock and bring it back. In the meantime the trans worked perfectly, no problems. I'll continue to drive it until it acts up again, hopefully it will happen where I can get it to a mechanic to observe.

Last edited by RDG; 09-08-2011 at 09:30 AM. Reason: sp
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