Not far off if you use a defender box. Just some minor tunnel mods. If you use a disco R380 then the shifter will be between the seats.
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Fairey overdrives have lots of weaknesses, the worst being wear on the mainshaft. The small needle rollers wear longitudinal grooves causing the overdrive to whine its head off. A mainshaft is nearly as much as a new unit!
Also around 500ml of oil is not alot!
A high speed transfercase is the best bet, but they are only made in uk now.
I wouldnt recomend 35" tyres on any rover, you lose too much braking efficiency and the loss of gearing is amazing. Gearing is what made the Landy so much better than jap 4x4s.
Technically a 900x16 is 36". Aus didnt officially get any 101's, the rapier training vehicles were on loan, and we didnt get any 1 ton Landies. Forward control 2A and 2B had a different t/case to "normal" series, and the 2A FC I did drive had totally crap brakes. My comment was aimed at more common and everyday Landies/Rangies. I do stand corrected owners of these classics!
I fitted a Roverdrive to my Seiers III in 2004 and since then I have put on over 100,000km with it.
I have no problems to report at all. Change the oil as per specs and away you go.
A handy tip is that a tab cab be mounted onto the mounting bracket for the OD lever. This can be used as a lifting point as it sits over the CoG. Very handy for getting the whole drivetrain in and out due to the extra length with the OD.
Cheers
Martin