Te best diesel conversions I've seen in a 101 are a 6B Cummins (went like a rocket and did 14's all day everyday with fuel economy and a TD5, but the owner of that one - a Mechanic - said it was a nightmare conversion to do and wouldn't consider it again.
If my V8 ever craps itself, I'll be thinking of a 4BD1T conversion and 5 speed - Ray from Roamerdrive is developing a kit to mate a strong, cheap readily available (in the USA) 5 speed to this engine and an adaptor to bolt an LT230 to the back of it. He's prototyping this conversion in a 101 as his current project.
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