KLR run an R380 behind a 4BD1T in their own RRc. They have probably done more 4BD1 conversions than anyone other than JRA.
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Still a toy gearbox though. Wouldn't rely on one behind a 4bd1T as far as i could throw it. Easy to have one fit a rrc of course but that doesn't make it the best choice.
Just my personal opinion i will add.
Jc
Certainly i don't doubt they have successfully fitted and used plenty of them Diana however i am of the opposite opinion regarding the overall suitability for utmost reliability. Sure they are a nice trans to shift and quiet in operation also the stock looking conversion to diesel is a very good reason . I'm just not enamoured with the R380 at all for this application .
Another 2c from me. ☺
Jc