Liberty shifted 18 spline problem?

Hey all, just bought me a liberty trans here not to long ago from another guy. I'm new to these, anyways finally got it in the car. The problem I'm having is it won't stay in third gear, every gear works great. Not sure were to look, adjusted it a bunch of times. Anyways I thought I'd ask here first.
Thanks!

Take the shifter lever off of the tranny side cover and see if the rectangle on the shift arm is worned so it is not square on the ends that the shift lever fit onto If so that may be the problem or part of the problem If not look remove the side cover and look to see if it is a early cover with rooster combs and brass shifting forks or the later one with the GM style cover with steel shifting forks. If it is the early one make sure the check balls, one on each side of the srping are in place, also look at the half moons that the check balls ride in. If those check out good the last thing that can cause what your having is the slider and the engagement rings on third gear being worn,not uncommon Or maybe the snap ring that holds the synchro hub on the main shaft (output shaft) is loose or missing Lots of gremlins out there, especially on used race parts Good luck, let us know what you find. BTW,I had a set of gears that I had to hold the shifter in third gear or it would pop out I ended up having it redone(new engagement ring on it, and put a new slider in the box and that fixed that 3-4 gear set

When the slider and the rings are at the end of their life span they pop out of gear. At WOT its real fun. If all adjustments are good its time to go back to Liberty to get "Face Plated" Don't waste any more money on "Pro Shifting" It is a thing of the past

I understood with a pro shifted trans you have to hold in gear or it will fly out of gear, nature of the beast .The advantage of the faceplate was they would not pop out of gear. aAuded to on the Liberty site

I recently rebuilt an 833/18 spline using brand new Liberty parts. I had the same issue. The trans would pop out of 3rd gear. After pulling the trans out 7 times and tearing it down on the bench to make sure I didn't mess up, I was at wit's end. I then called friends Herb McCandless(Mr. 4 speed)and Arlen Vanke for advice. Both told me to lightly loosen the side cover bolts and smack the right rear corner of the side cover upwards with a hammer and retighten the bolt's. Dang if that didn't work.

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I understood with a pro shifted trans you have to hold in gear or it will fly out of gear, nature of the beast .

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Not true when all parts are good Sounds like Liberty wants to sell the new technology now