Transmission Shift Lever Adjustment

[ARGluck]

Bought this truck a few weeks ago (my intro post is still floating around) and it runs really well. The only thing I feel really needs to be fixed is the shifting for 1-R. Someone converted it from 3 on the tree to the floor and either then or someone between has created a 1-R that doesn't truly engage.

Currently (pic below, all in neutral) the shifting is upside down (1 where R typically would be, 2 where 3 would be). Not a hard fix, actually an incredibly easy fix. The real issue is I can't just rotate the shift lever 180 degrees (for 1-R at least) because it's not aligned vertically. It's slanting closer to horizontal when in neutral than it is vertical. This of course means when I shift to 1 or R even if I throw the shifter a very long distance I'm not really engaging 1 or R. It's bad enough that if I'm not really careful I'll drop out of first.

Anyway, long story short, I need to adjust this and I'm looking for advice and information on exactly what I'm getting myself into. Perhaps someone has a few pics or instructions... I can easily remove the linkage and levers, pull the cover and have access inside the case but can I even adjust this without removing the tranny?

Before I get too deep I'm hoping someone can explain what I'm getting myself into and provide advice.

Thanks for your time