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MylilBowTie · 06-05-2007, 09:20 PM

77 is for the year and the letters are the designation for the type.

Bolt on yoke is pretty common for th400s in a long bed truck. Being a 1ton crew cab I would be really surprised if wasn't a bolt on yoke. You do have a deep transmission pan for better cooling and extra fluid capacity. The 475's have a lower gear ratio for 1st - 2nd and heavier duty internals. Its the heaviest duty automatic that could be gotten I believe. I'm not sure about the newer Allison automatic line.

06-05-2007, 09:20 PM	#10
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: TH475 vs TH400 77 is for the year and the letters are the designation for the type. Bolt on yoke is pretty common for th400s in a long bed truck. Being a 1ton crew cab I would be really surprised if wasn't a bolt on yoke. You do have a deep transmission pan for better cooling and extra fluid capacity. The 475's have a lower gear ratio for 1st - 2nd and heavier duty internals. Its the heaviest duty automatic that could be gotten I believe. I'm not sure about the newer Allison automatic line. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI Last edited by MylilBowTie; 06-05-2007 at 09:28 PM.