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Last Updated
18/4/08

The Series Land Rover Gearboxes



The Series Land Rover gearbox started out life in a Rover car dating from 1932. Series I Land Rovers had permanent 4wd for the first 3 years of production; utlising a freewheel device in the front propshaft. Then a transfer box was introduced and the 4WD became selectable via two additional gear levers.

The main gearbox has remained fundamentally the same throughout the Series I, II and III Land Rovers from 1948 to 1984; there were modifications to increase strength of various parts and finally to add synchromesh to all gears. The IIA transfer box was retained as an unmodified unit, when full synchromesh was added to the main gearbox of the Series III.

It is debatable as to whether the discontinuation of the oil dipstick from the suffix B gearbox onwards was an improvement. It is widely held that the Series 3 all syncromesh gearbox is a weaker box than it's IIA predecessors, although some efforts were made to increase it's durability towards the end of it's life. The Series 1 gearbox also had a tendency to break shafts if worked hard.

The table below shows overall gear ratios for a range of Series Land Rovers.

 
4th
3rd
2nd
1st
Rev
 
High
Low
High
Low
High
Low
High
Low
High
Low
Series I, 80in 5.396 13.578 8.039 20.229 11.023 27.738 16.165 40.676 13.743 34.581
Series II, 88in 5.396 13.578 7.435 18.707 11.026 27.742 16.171 40.688 13.745 34.585
Series IIa, 109in 5.396 11.05 8.09 16.57 11.98 24.51 19.43 39.74 16.3 33.34
Series IIa 109in 1 ton 7.19 15.4 10.80 23.10 15.96 24.10 25.90 55.3 21.7 46.4
Series III 88in 5.396 11.10 8.05 16.50 12.00 24.60 19.88 40.70 21.66 44.30
Series III 109in 1 ton 7.19 15.40 10.80 23.10 15.96 34.10 26.46 56.56 28.91 56.56


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