Series 2 and 3 Transfer box High Range Conversion done by Ian
Aschcroft Conversions UK
The mod happens as follows.
In high range mode your transfer box has 3 gears in circuit.
1. The gear that sits on the end of your normal 4 speed box.
2. A large intermediate gear that sits in the middle.
3 .The gear that spins on the transfer box out put shaft.
a. Gear 1 has it's spines machined out so that it can spin in gear 3's position.
b. Gear 3 has splines welded in so that it can be bolted back in gear 1's position.
c. The intermediate gear shaft holes are filled up and re-machined to suit the new gear
(I don't know if the original intermediate gear is used )
End result------plus minus 25-30 % more top speed fuel saving but with the same low range
Problem is that the gears are now unique and must be made up when required.
-- Bruce Molzen
WARNING: This is some other advice we
Don't touch the transfer box 'upgrades'. If you're not looking at an entirely new
casing specially built for the upgrade, the only way anyone can accomplish the
change in gearing is to move the pivot point of the gears to an unsupported
location, which creates a weak point.
-- Paul Oxley
This will be subject to the support webbing within the transfer box. Use your
discretion when considering this option as the costs involved in the gear change
are unlikely to be less than swapping your crown wheel and pinion sets for
3.54:1 ones, though this would affect your low range as well.
LT 230 Transfer Boxes
These transfer boxes are found behind the LT85 /
77 and R380 Manual boxes and behind the Discovery 4 speed ZF Automatic.
There are 4 different gear ratios
available for these boxes, they are all interchangable.
1: 1.667 Originally fitted to the
4 Cylinder 110 and possibly the 2.8i Defenders
1: 1.42 Originally fitted to all
V8 110 and 110 Defenders as well as 4 cyl 110 TD
1: 1.193 Originally fitted to All
Range Rovers and Discoverys
1: 1.003 Special gear set for
conversions, supplied by Land Rover Engine and Gearbox
Specialists - UK (L.E.G.S)
Rover Gearbox Transmission conversions from
Ashcroft by LandyOnline