The Ultimate 4x4xFar

LandRover Ser.II/IIA Technical Pages

(This page is one of a series which are slowly being created to document my findings as and when I do a bit of work on the relevant bit on one of my LandRovers)

CAUTION !
This section is still under
CONSTRUCTION
Please return soon !

Gearbox, Transfer Box, Overdrive & Clutch

Over the years, LandRover upgraded the design of the gearbox fitted to the Series Landrovers. My experience is essentially with those of the Series II & IIA. The Series III box was of similar construction, but has synchromesh on all four forward gears, and uses a different bell housing and clutch release mechanism/bearing. The strongest box fitted to a series LandRover was the later suffix D & E boxes as fitted to the IIA's, and is allegedly good for 140 bhp. I've run a 3,528 cc Rover V8 through standard boxes since September 1988, (~100,000 miles) with three failures - two of which required a tow home.

Collapse of rear bearing (cylindrical roller) on layshaft of Suffix A G/Box - Pre-failure symptom: Noise, particularly in lower ratio and reverse, plus parts of bearing in oil !
Shearing of drive dog/teeth between Xfer box output shaft and high ratio gear - Pre-failure symptom: Xfer box jumping out of drive into neutral when in Hi Ratio.
Shearing of mainshaft - Pre-failure symptom: None !

**Overview of Technical Changes**
	Dates	Bell Housing	Gearbox	Transfer Box	Hand Brake
Suffix A
Suffix B
Suffix C
Suffix D			Larger front bearing on layshaft	Larger intermediate shaft 1 " dia.
Suffix E

**Bearings**
*(Manufacturer/ISO Codes followed by Rover Part Nos. and dimensions/type; IDxODxWidth)*
*Numbers in brackets refer to exploded view of g/box.*
	Gearbox						Transfer Box
	Clutch Release	Primary Shaft	Mainshaft		Layshaft		Intermediate Shaft	Rear Output Shaft		Front Output Shaft
	Clutch Release	Primary Shaft	Front	Rear	Front	Rear	Intermediate Shaft	Front	Rear	Front Output Shaft
Suffix A					FAG MS8 576207 3/4"x2"x11/16" Deep groove ball
Suffix B
Suffix C
Suffix D
Suffix E

**Lip Seals**
*(Manufacturer/ISO Codes followed by Rover Part Nos. and dimensions/type; IDxODxWidth)*
*Numbers in brackets refer to exploded view of g/box.*
	Gearbox	Transfer Box		Differential
	Mainshaft Rear	Rear Output Shaft	Front Output Shaft	Input Shaft
Suffix A
Suffix B
Suffix C
Suffix D
Suffix E

Download gear ratio spreadsheet -

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me with your thoughts, ideas and experiences.

Disclaimer Whilst every care is taken in researching and presenting the information contained within these pages, I can accept no responsibility whatsoever for any consequences resulting from its application and use.