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Re: GM Semis
It literally was 2 4 speed Hydramatics, one on top of the other. Not terribly successful, the Twin Hydramatic was replaced by the first Allison truck automatics in the late 50's. And there is still a Ralph's on the corner of 3rd. and Vermont.
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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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