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What is the PCM showing for TP (throttle position,) VSS (vehicle speed,) TSS (input speed,) OSS (output speed) and engine speed when it should shift to third gear?
 

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Your TSS divided by OSS shows a ratio of 1.54:1. That's second gear. So it's commanding third, but not shifting out of second.

Does reverse work correctly? If so, that shows that the direct clutch is working. The direct is used for third gear and reverse. If reverse works I would suspect a stuck 2-3 shift valve in the valve body. If reverse doesn't work, the direct clutch is hosed. Not commanding fourth gear is because it won't shift to third gear.
 

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A problem with the solenoids should set a code. I can't rule out the solenoids, but it sure doesn't seem likely.

This is a puzzler. Since reverse works, we know the direct clutch works. When the trans makes a 2-3 shift all it does is apply the direct clutch. Maybe there is a leak in the solenoids or the gasket for the solenoid body. The direct clutch is applied by the solenoid for a 2-3 shift, but is applied by a hydraulic circuit without the solenoid in reverse.
 
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