Re: 1966 gmc 4000
Most likely would be an oil bath type. You might try asking these guys for a picture or more specific information:
6066gmcclub.com
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.
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