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Re: Factory 4L80E in a K2500 - what was the first year?
I suspect in 1991 the TH400 was the base automatic and overdrive might have been an option.
I have a (1989 I think) shop truck with a 4.3lV6 and a TH400. Base truck where they wanted an automatic but didn't order an OD
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My Classics:
'72 K20 Suburban + '65 Dodge Town Wagon
'72 Corvette Roadster +'67 Corvette Roadster
'73 Z-28 Camaro
'63 Ford SWB Uni Pickup
'50 Ford Coupe
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