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Discussion Starter #1 (Edited)
Once the RPMs come down a bit it'll shift, but not when shifting at ~5500 RPM. It has been able to np historically, this is new.

Anyone have a suggestion why this could be happening?
 

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Discussion Starter #3
Have you tried replacing the trans fluid with a more viscous one?
Thanks for the reply! I did not. My local transmission shop opened it up and replaced the syncros. Shifts great now.
 
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