4BB1 is an old 3.6 L - was supersceded by the 4BE1 (also 3.6 L - but more power and torque than a 4BD1) because it was known for breaking cranks in trucks.
There is also a 4BA1 (2.8) and 4BC1 (3.3)
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MY 4bd1 has the letters cast into the block just under where the
dip stick comes out
well... I finally got hold of the owner. 4BA1, 2.8.
dont know much about the isuzu engines, but the tojo 2.8 is as strong as an ox but a bit of a dog on the highway. are isuzus the same?? Vehicle has o/drive so...