Most likely tranny rebuild time.  Apply and release throttle while gently
pushing the shifter forward in third gear. If shifter noticeably moves
forward/back with change in throttle then main shaft roller bearing is
worn/loose.  Replacement or repair of gear carrier housing will be required.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Geneva Saint-Amour
Sent: Friday, March 16, 2012 11:00 PM
To: vanagon@GERRY.VANAGON.COM
Subject: jumps out of 4th gear...

Culprit- 1985 Westfalia running a Bostig conversion (love it!).Timing- When
running at 70+mph with a foot on the pedal.Frequency- Once every 50
miles.Diagnosis? Prognosis?
Geneva and Mike Saint-Amour1985 Westfalia Bostig Ford 2.0 Ztec motor- "La
Paradima"1968 VW Sedan- "Stealth Bug"1969 Karmann Ghia- Yellow, twin to a
former drag racer1968 Manxish Turbo buggy, loves the sandFormerly BB's
Project VW (an acre of air cooled parts for sale)