The 4BD1 and LT95 from an '81 Stage1 that I put in my county had the 1.3:1 high range ratio in it from memory.
Pretty sure it was a genuine.
If you're just after lowering the revs at 100kmh and the LT95 is in otherwise good condition just get hold of some .996 high range gears and fit those. Much easier than a 5 speed conversion, and you don't even have to pull the box out to change them.
Add a turbo and some 255/85's and you'll be pleasantly cruising at about 2000rpm (quite a big drop from the 2600ish that you'll be doing now if you've got the 1.3 gears).
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
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