I wouldn't say "issues" but it is a pretty far jog over to the right to get it into 6th gear. Just took a little bit of getting used to, but after that not issues at all.
Exactly. It is way off to the right its not a natural shift and definitely not the same width or spread as 1-2 to 3-4. Its a like H pattern design the a { added for 5-6. Just feels way off.
One test can eliminate clutch as the problem by slogging along in 4th and let off the throttle put it into neutral then give slight pressure into 5th. You need to be quick but not too quick and not too firm. It takes practice but if you have exp. driving an old dump truck you will be good. Even motorcycle expierience is good as you have the idea of clutchleess up shifts already. Same idea but with a slight pause and at a low rpm.
If it goes in with no issue then your synchro's are fine and gears etc but if theres just no way in hell to make a shift without the clutch then you have gearbox issues.
Now that I think about it it may be easier to try the 3-4th shift. I can do this easily. You have to be kind of totally putzing along for it to work but it will go right into the next gear.
More than likely you have a worn clutch not fully disengaging or something related to that from your description.
This is my first jeep jk and definitely first NEW vehicle but I have had mostly 70s muscle cars with T-5 trans and even a brand new t-5z will not shift as well as this jk gearbox. Its really good for a truck.
The only issue you should have that is normal is trying to shift near redline too quickly. If the rpms dont drop enough it does resist. I just double clutch when im hammering on it and its all good.
Hopefully some of that rambling on helps you

^