53 M37 still pops out of first gear under load?

[RFranklin]

Ok guys, looking for some of your experience to answer a question. I have new bearings in the stock c88671 transmission behind the stock 230 six engine. This past weekend I did the machining to repair the loose shifter pin and made a new cone washer for the spring underneath the shifter ball. Much better but under a load such as going up a good hill in four low it will still slowly walk out of first gear. I have also installed new shift rails in the trans top. What am I missing?

[Cheyenne Dave]

You probably did this, but did you replace the shift-rail detent springs?

CD

[RFranklin]

I did not as I could not locate any. They appeared to be the same length and appeared to be same strength but maybe that is it. Any idea where to find some?

[Cheyenne Dave]

If you have already inspected them and they are in good shape, it would seem you have done your duty. I assume the detent balls had no apparent wear either.

It was a long shot, but I thought I would throw it out there.

CD

[John S]

Did you notice if the plastic inserts on the shift forks are in good shape ? I have seen some cases where the are missing.