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Sounds like synchros are wearing out. 1st and 4th are only going to get worse. pretty soon you'll have to hold it in first gear at low speed and at slowing down all the time. and 4th gear you will loose completely. was there any warranty on the work done?
You can try replacing the detent springs for the shifter.
Detent Springs??? More info please?
Popping out of first gear is most likely the sign of a worn out center bearing retainer plate. I don't believe the retainer is a serviceable item and therefore I think most rebuild shops just slap it on and reinstall it without shimming or replacing it with a heavier duty unit (like we would since we manufacture them). It could also be a worn shift hub or a wasted counter shaft bearing but you'd certainly have hoped those to have been properly inspected & serviced by a rebuilder. None of these can be fixed with external repairs such as our HD seat/socket and HD springs. They can help, but are more like a band-aid for a problem that will only get worse.
The stock center bearing retaining plate on a W56 should be fine. My W56b was a nice machined iron plate...........
I will wager to say that every single W56 and W59 that has come through our doors has had a worn our center bearing retainer plate. We mic and immediately discard any piece that fails inspection. It's this very reason which prompted us to manufacture our own plates (see here and here) but we haven't released a W-series plate yet but do have plans to eventually.
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