The GM TH 400 was used in CJs with the BW 13-39 transfer case from 1976-1979. The TH 400 was used in full sized Jeeps (SJs and J series pickups) from the late 60s until 1979. The TH 400s used in CJs and later SJ had the AMC engine bolt pattern. In the late 60s the TH400 was used in SJs with the Buick 350, so it had the BOP/BOC (Buick, Olds, Pontiac, Cadilac) pattern. Some early TH 400s with the AMC engines used an engine to transmission adapter.
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This 'Jeep Thing' is killing me!