LT230T/Q Transfer Gearbox

LT230T/Q Transfer Gearbox

The LT230T has been used for many years and is manufactured by Land Rover at the factory in Solihull, England. It utilizes a constant mesh gear train with a front to rear differential, and a differential locking mechanism.

Its use on North American Specification (N.A.S.) vehicles began with the 1987 and 1988 Range Rovers. It was used on all N.A.S. Defenders, and 1994 to 1999 Discoveries . As a running change in 1997, the LT230T was replaced with the LT230Q which features numerous detail improvements including fine cut teeth on the high range gears. This was done to reduce noise. The low range gear teeth remain coarse for strength.

This transfer gearbox was replaced in 1999 by the LT230SE, with the introduction of Discovery Series II (LT). The LT 230SE is essentially the same construction but with an uprated torque capacity and new sensors and switches.

Beginning with the launch of Discovery Series II (LT), the differential lock function was no longer driver selectable although the internal components were retained. For the 2004 North American model, driver selectable differential lock again became available using cable linkage activation.