Two types of Gearbox were used in Series III models. The original LT76 (LT for Leyland transmissions and 76 due to the 76mm between mainshaft and layshaft centres). And the LT95 as fitted to the V8 powered models.
Gearbox Numbers are usually found on the right hand side of the box about here.
881 All 109 V8 models and probably 88 V8s as well. Suffix A only.
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246 Easy change gearbox used with 4 cylinder petrol engine in one ton and other special models. Suffixes B, C, (from May 1980) and D (from 1982)
266 Easy change gearbox used with 6 Cylinder petrol engine in one ton and other special models. Suffix A only.
361 As 901, 902, 903 series for 4 cylinder engines, continuation numbering sequence. Suffix D only.
367 Used with Diesel engine for Danish Army: As 895 series. Suffix D only.
895 Dutch Army specification for Diesel Lightweights. Suffixes A to D inclusive.
901 Standard gearbox used with 4 cylinder petrol and diesel engines. Suffix A only.
902 Standard gearbox used with 4 cylinder petrol and diesel engines;continuation of 901 sequence.
Includes special 4 x 2 gearboxes for Belgian Army from number 902-06747B. Suffix B only.
903 Standard gearbox used with 4 cylinder petrol and diesel engines:continuation of 902 sequence. Suffix C only.
904 Standard gearbox used with 4 cylinder petrol and diesel engines:continuation of 903 sequence:from March 1980.
905 Swiss specification for Army and Postal service vehicles with 4 cylinder engines;stepped output shaft.
910 Swiss specification for Army and Postal service with 6 cylinder engines;stepped output shaft. Suffix A only.
941 Standard gearbox used with 6 cylinder petrol engine. Suffixes A to D Inclusive.
951 Used with 4 cylinder engines for British military;probably only in Lightweights. Suffixes A, B (from April 1977) C and D.
Suffix A from 901-00001A Initial specification.
Suffix B from 903-387698 Stronger reverse gear train, reverse now 3.887:1 change dated September 1977.
Suffix C from 904-35600C First speed gear with reduced number of teeth, ratio now 3.729:1 (ex 3.684:1) change dated March 1980
Suffix D from 904-81491D ECM manufacturing of gears, modified layshaft gear cluster as introduced late in C suffix production. Change dated October 1981.