The LT85 isn't as strong as the 4 speed LT95, the LT95 has a lower low range than the lowest stock LT230 as well, absolutely fantastic with this engine in my 110. The later R380's are meant to handle this engine okay from what I have heard. The 4BD1 was fitted to Australian 110s during the 1980s from factory and is something of a holy grail for reliable Landies, so there is a fair bit of technical knowledge around on this combination. The engine is renowned for breaking gearboxes... You can get the LT95 bellhousing from Aus, and the LT85 bellhousing suits the R380 as well.
Last week I did a 3000km trip in mine (which is naturally aspirated), I can cruise on the freeway at 100km/h all day, have hit 120km/h but my mechanical sympathy and speed limit of 110 made me slow down. Hills kill it though, the turbo would kill the hills
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Sorry I don't know MPH conversions.
A 4BD1T in a Disco 2 would have be be the best compromise between luxury and off-road performance!