Rebuilt Transmission popping out of 3rd under load

[Gratsoy]

Have been having a hell of a time with my tansmission.

When I had the engine out I had my, then working, transmission rebuild by a local shop as a "might as well" decision. At the time it was running well but I thought it should get resealed and new synchros.

Reinstalled it and it had zero 4th gear - would not engage at all. Removed it again and had them rebuild again. Apperently the 4th gear assembly was bad and needed to be replaced. No idea how they managed to mess that up.

Took the car out after re-installing again and now it shifts nicely but once you get into 3rd and start to accelerate it pops out. It does seem to shift into 3rd and if I hold the shifter gently it doesn't seem to complain. But, I cannot drive hands free of the shifter in 3rd. (At least I have 4th now....).


Is it possible that this could be anything other than an internal transmission issue? All mounts, linkages, even reverse lock out plate are brand new. Shifter moves nicely into gear (though it needs clutch to hit 4th when testing) - I've played with that a little and it doesn't seem to make any difference.

[67rustavenger]

The shop that built the trans should make it right, period!

When my trans was rebuilt by a local guy here. It popped out of first gear under any load.

I called the builder and he said bring it to me.
I asked him if he meant the trans or the car. Bring the car to me, he stated.

Since I paid to have it rebuilt and it wasn't working as it should have, the shop did the r&r of the engine and trans. Rebuilt it correctly this time around and reinstalled the engine.

Three days later the shop called and said, come pick up your car.
I hired a Lyft and drove the car home with no issues.

Your shop should do the deed as my guy did if, they are a stand up kind of shop.
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[Cusser]

I bought a rebuilt transmission for my 1970 from MoFoCo back in 2018; it's been fine.
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297

[zerotofifty]

I rebuilt my own, 47 years ago with my dad, still good, near 180k miles later The factory build only lasted 155K miles! It was popping out of first when I rebuilt.

Id be asking for my money refunded at this point, and find another shop to do it right.

What's that saying about insanity and doing the same thing over and over, expecting different results?

Good luck
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[67rustavenger]

[zerotofifty]

[Q-Dog]

[sodbuster]

Pretty simple. The transaxle was rebuilt. (possibly unnecessarily?) There was a problem with 4th gear and taken back to be made right. It was taken apart again supposedly fixed only to discover it now pops out of 3rd.

The way I read it you are installing it yourself. if so Make the shop aware that there is still a problem with the transaxle and see if they want to see the whole car and check it over themselves. That's a start anyway. If they don't care to make it right once they have had a look ask for your money back.

[Bruce]

[Bruce]

[esde]

Generally:
trouble going in is a synchro issue
trouble staying in is a worn hub or slider, or incorrectly set shift fork.
3rd and 4th gear use the same shift fork and slider, it just moves to the front of the car to engage 4th, or rearward for neutral, and one more click rearward engages 3rd.
This is the second issue with this trans and specifically this group of parts inside the transmission. Ask specific questions. Ask exactly what was changed the first time it went back. What was replaced during the first rebuild. Post the answers here even if you don't fully understand them.
It could be something that's hidden or being difficult. But the second time it goes back I start to wonder about the shops abilities.
SD
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[Bruce]