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Fixes 4 Hard Shifts No Overdrive 4L80E Dave 2-13-09  
Problems due to a bad speed sensor on tailshaft of trans or rear of transfer cases 4X4. Also related to electronic throttle control on diesel. The trans ecm looks at pulses from both to determine shift points and lowest possible gear for downshift. If you have not had any service throttle light, then move to the speed sensor. I will check back now and then to see how things are going.
Re: Fixes 4 Hard Shifts No Overdrive 4L80E Dave 2-13-09  
This is assuming all connections, especially grounds are good. Also chech for a solid 12 volts or better at the trans. Pull the sensor and check for any metal stuck to the magnet before going for a new one.
Re: Fixes 4 Hard Shifts No Overdrive 4L80E mike verdetto 3-4-09  
Maybe pressure reg. sticking in valve body or pump
Re: Fixes 4 Hard Shifts No Overdrive 4L80E John 3-27-09  
I have had my truck in the shop now for a month and codes keep poping up mainly hard shift then it refuses to shift tranny has just been rebuilt I am at a loss taken it to 2 shops and same thing any ideas?
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