It does have a transmission computer (TCM). The reason I don't think that is the problem is because it shifts through all the gears just fine when I put it into "manual" or "tip" mode. So, that would suggest (to me) that the computer is working to change the gears and I'm back to I guess not having enough pressure inside the tranny to shift into that 5th gear (which requires the most pressure & hence that one failing). Again, these are all guesses from me, as I really know little about transmissions.
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