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OK, it sounded like you thought 4th gear was working, so the solenoid must be as well. What gives credence to this is you recognize the noisy, scary way the engine sounds when 4th is locked out.
If not, and you decide to remove the solenoid, I can stress the importance of cleaning behind the solenoid before breaking those bolts loose. Use a mirror and powerful light to be sure the road grime is not ready to fall into the transmission as you lift the solenoid from it. I can stress this because of the typical "don't do my mistake" sting of recent failure.
I did replace one very recently, and in doing so, failed to clean this area well. After pulling the solenoid, I wiped a finger-tip full of little rocks which had lodged behind it and escaped the rag. After replacing the dead solenoid with a working unit, the 4th gear still did not work. I feel very lucky it began to work again, which I discovered about 200 miles later when the car returned for another issue.
Here is evidence I knew better and just got sloppy: http://cleanflametrap.com/pub_autoOD/

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Art Benstein near Baltimore
What's the definition of a will? It's a dead giveaway.
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