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I have a 78 F100 with a 4 speed (OD, no granny gear.) 2nd gear pops out when coasting down hill. Can I fix the syncronizer myself? I have not pulled any numbers off the tranny yet but thought some of you guys could help me regardless. Thanks.
While you have it apart, bearings etc should be replace.
As for popping out of gear, that is not a synchro problem, that would be a worn shaft or linkage problem. Bad synchro results in grinding or very hard shifting.
Look around this site for folks converting to ZFs and Mazda 5 speeds if you find your box has a fatal problem.
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