When Rover (still part of British Leyland) decided to go to a five speed gearbox they picked the existing LT77 for use in certain vehicles. The LT77 is an updated version of an old Jaguar gearbox that found its way into current model British cars manufactured by British Leyland. Yes the distance between the main and lay shafts is 77 mm. There were two version of this gearbox. The earlier version is known as the short stick version. The later version, introduced around 1988 is known as the long stick version.
The Range Rover received the LT77 in 1984 because it was less expensive than the new LT85 and considered strong enough for the 3.5L V8 to use as a street cruising gearbox. The four cylinder Ninety and One Ten also received the LT77. When the Discovery was introduced it got the LT77 as well.
The LT77S was introduced to the Defender V8 line and all models using the Tdi engine as an interim replacement for the no longer available LT85. The LT77S was a strengthened version of the LT77. The ‘S’ on the LT77S stands for ‘Synchromesh’…it was modified for a ‘smoother gear change’. The bell housings and input shafts of the LT77S differ between the V8 and Tdi due to Tdi’s more aft location.
If your serial number starts with any of the following then you have a longstick : 50A, 51A, 56A, 58A, 60A, 61A, 66A, 68A, 74A
If your serial number starts with any of the following then you have a shortstick : 53A, 55A, 63A, 67A, 69A, 73A
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