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Well I unfortunately may have my answer. While distracted by arguing with a passenger, I shifted from neutral back to 5th gear without blipping the throttle first (something I don't normally do) and the trans didn't appreciate going back into gear at 60 MPH from idle RPM. Although it didn't grind in the typical way, it kicked me out of 5th gear as soon as I tried to select it.
I think perhaps the 5th gear synchro may have been worn when I installed the trans as I don't think there's any way I could have caused any appreciable wear in just 6 months. It was from a junkyard after all. Although none of the gears grind while shifting from one to another, it seems that shifting back into 5th gear from idle at highway speeds is more than the 5th gear synchro can take.
I should have just replaced the synchros when I had the trans apart to replace the input shaft bearing before I installed it.
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