93 K3500 454 4L80E Tranny problem

2012 ALL OTHER MAKES ALL OTHER MODELS
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LIAMTHERED
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  • 1 POST
When the Trans warms up, it will no longer shift into 3rd or 4th. Also no compression braking. If cruising at speed, it will "freewheel" (engine returns to idle,no power until RPM reaches level for driving in second gear). Fluid is clean, as is filter. 50000 miles. serviced regularly at dealership since new. It only does this if the ambient temp is above about 65-70 outside. When it's cold out, it shifts normally. I know it's heat-related, but what is malfunctionong?

update:Took it to dealership. They couldn't reproduce the problem. Changed the VSS due to a code 24. After picking it up, I started home and it did it again. Dealership said bring it back.
May 23, 2007 at 12:34 PM
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E40WATER12
  • ✓Experienced Mechanic
  • 522 POSTS
Sounds to me you could have a problem with youre Transmission Control Solenoid, To make it for sure, I would recommend getting youre tranny scanned for trouble codes, Before u dish out cash. Heres a pic of the part possibly broken.


https://images.2carpros.com/forum/automotive_pictures/75270_Transmission_Control_Solenoid_1.jpg

May 23, 2007 at 8:14 PM
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