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, (there's posh !!) 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 as follows (only the first one didn't require a tow home !) :

Collapse of rear bearing (cylindrical roller) on layshaft of Suffix A G/Box.

Mileage;

Pre-failure symptom;

Shearing of drive dog/teeth between Xfer box output shaft and high ratio gear.

Mileage;

Pre-failure symptom;

Shearing of mainshaft.

Mileage;

Pre-failure symptom

**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	Centre	Rear	Front	Rear	Intermediate Shaft	Front	Rear	Front Output Shaft
Suffix A						FAG MS8 576207 3/4"x2"x11/16" Deep groove ball	RHP LRJA7/8JCN RTC 1412
Suffix B						NTN 6305C3 558701
Suffix C
Suffix D			6397 Needle Roller		217478 Needle Roller
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. Material: Nitrile rubber*
	Gearbox	Transfer Box		Differential
	Mainshaft Rear	Rear Output Shaft	Front Output Shaft	Input Shaft
Suffix A		IND.48893 / FRC 1780G 1 9/16" x 2.5" x 1/2" Ribbed lip + Dust lip
Suffix B
Suffix C
Suffix D	M11933001/2 / 236305G 2.0"x3.0"x0.5" / Plain lip
Suffix E

Download gear ratio spreadsheet -

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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.