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or do any of you wise ones out there know differently?
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Gosh. Flattery.
A common reason for creeping out of 3rd is a bad pilot bearing in the flywheel. A bad pilot will "oscillate" the input shaft to the tranny causing the 3rd/2nd gear to walk off the 3rd position.
Do you have the front shield on the front main bearing in the transmission oriented correctly on the shaft? If placed reversed it might cause the input shaft/bearing of the tranny to be too far 'forward' resulting in a tendency to pop out of 3rd gear.
See part 7 on Snyder's tranny diagram.
http://www.snydersantiqueauto.com/up...ODED-10150.pdf
Check your tower to be sure you have the "indents" clean on the 2/3 detent rail clean and that the spring detent can reach fully into the indent and hold it when you are in 3rd. (this can be done by removal of the tower to the work-bench.)
While tower out, you can mark the detent rail somehow to indicate the "detented" position of the slider rail when in 3rd. Normally seen on the "front" surface of the shift tower when removed?
Then, with the tranny assembled, try to repeat the same test and verify the rail is "fully detented" when in 3rd gear. You may be able to look in the viewport of the bell housing and with a mirror see the same front surface of the tranny and bellhousing holes which allow one to where the detent rails are. The driver side detent rail is the one to look at. (lever right - movement of left shift fork/left detent rail.
You're looking to verify if a "mis-match" exists between full detent position and full 3rd gear position.
With modern parts such a condition may be possible through error of manufacture. You haven't mentioned if you replaced the detent rails or re-worked your shifter forks. If so you might try comparing these parts to an original part?
Reaching a little bit on this last to achieve a diagnosis? Or means to get it?
Joe K