The synchronizer rings only help to synchronize the gear with the slider for
engagement. Worn Syncros means crunching going in and rarely will they
actually wear out unless abused by a bad driver or clutch. The slider and
hub has the spring loaded detents to keep the slider engaged with the gear.
It is this hub that often cracks. Worn teeth on the gear or slider can cause
pop out problems. The detents on the selector shaft also help keep things in
gear. But if the main shaft is moving too much these things can't work.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
levi hawkins
Sent: Saturday, March 17, 2012 2:12 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: jumps out of 4th gear...

And here I thought that jumping out of 4th gear was was caused by bad
synchros. Had one get so bad that I hooked up a bungee to keep it in gear
back in the 70s

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