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mike m
Thanks for all the comments.
Power Wagon, Thanks for the info.
Trey, when I did replace the master cylinder the last time I bought a new slave as well so I had everything new minus the line. All my other vehicles (non Dodge) have a hydraulic clutch set up and this is the only one I've had problems with and they have lasted more than 10 years of use. I thought maybe NAPA had defective parts and I should try another brand. Just trying to see if anyone else out there had similar issues.
Jimmie, Do you know what the correct P/N is for the clutch master cylinder? My NAPA receipt shows 36066. Also, I know what you mean by bleeding them. I have experienced the same thing.
Again, thanks all for the input. Appreciate it.
Mike M

Doggone, I don't have the full info! I posted it here for archives about 1 to 1-1/2 years ago, but my own computer crashed! Hopefully someone saved it. I think it was a separate topic just for that purpose, like 'Brake & Clutch Master cylinder numbers', something like that, not sure.

My current brake master is # E1353 [possibly that 'E' is for Echlin as NAPA p/n] and clutch master looks like 29798 C, or 28798 C. I'll try to get a closer look at clutch master numbers later today.

All these below are for 1965 D-100's Clutch master, except last entry for Brake master:

P/N 36066 is listed for some trucks, not all.
DORMAN Part # CM36066 {First Stop #2230502, 5463098}
Bore = 1-1/8"; Exc. Town Panel or Town Wagon

Town Wagon/Town Panel uses:
DORMAN Part # CM35085 {First Stop #18002283, 1936563, 2230799}
Bore = 1-1/8"; Town Panel or Town Wagon

PERFECTION CLUTCH Part # 35085 for TW/TP and # 36066 for other Dodge truck.

Those are 1-1/8" bore for clutch master.

Brake master @ 1" bore is listed as:
RAYBESTOS Part # MC36202 {Professional Grade; Bore Size - 1", Number of Ports - 1 Primary Outlet Size - 1/4x18 NPT}