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Old 03-26-2015, 09:49 AM
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4l60e no 4th or overdrive?

Hi there I recently purchased a 93 Chevy c3500 1ton dually with a 350. Truck runs great and has had a transmission rebuild roughly 30,000 miles ago. 1st, 2nd, and 3rd work as they should, but 4th will not engage. When you are in 3rd and let off the gas it idles low as it should as well. Any thoughts would be great! Thanks!

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Old 03-26-2015, 01:45 PM
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EDIT: the truck only looses 4th sometimes, it seems more often when it is hot. I have lost 4th and pulled over, turned off truck and let it sit for a minute, then it usually will engage for a little while longer.
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Old 03-26-2015, 02:19 PM
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Ck all wires,plugs,connections.Especially those associated with the TPS.(throttle positin sensor). Also ck oper ation of the TPS.Using a multimeter,probe the wires from the TPS with key on/engine off.Blue wire is 5 volt reference.You should have 5 volts.Black is ground.Gray is the signal wire.It should read approx. .5 volts with throttle fully closed.Slowly open throttle watching meter.Voltage should rise smoothly to 4.5 to 5 volts @ WOT.No spikes or flat spots.
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Old 03-26-2015, 05:39 PM
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Would hazard a guess that the 3-4 clutch is weak... poor seals, which may explain why it is worse when it is hot....
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Old 03-26-2015, 11:59 PM
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a 3500 should be a 4l80
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4l60e, 4th

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