Neutral
Sounds to me like you have a problem with the 3rd gear syncronizer hub that is splined to the mainshaft. 3rd doesn't work because of bad hub splines and with the trans in 4th gear the output is straight through the mainshaft, but if the hub inner splines were gone......no output. 1st and 2nd work fine because they go through the cluster gear.
Just my 2 1/2 cents
JP
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6year Heritage A&F
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1969 Hurst SC/Rambler(only 1,512 made) in the middle of restoration.
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