Not knowing what year your TH400 is, I picked '68 Bonneville and looked up the seal on Rock Auto. They list two parts. One is an SKF 15041 which has a shaft size (ID) of 1.5" and a OD of 2.381" There are about a gazillion alternate/OEM part numbers for this seal. This isn't what you need.
Then there is a L&S Automotive Products part # 7116871 'A/T rear seal 1.687" shaft'. They don't list the OD size, but this may be what you need.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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