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

  2. Mileage; Unknown.
    Pre-failure symptom;  Noise, particularly in lower gears and reverse, plus parts of bearing in oil !
  3. Shearing of drive dog/teeth between Xfer box output shaft and high ratio gear.

  4. Mileage; Unknown.
    Pre-failure symptom;  Xfer box jumping out of drive into neutral when in Hi Ratio.
  5. Shearing of mainshaft.

  6. Mileage; 69,000 since rebuild, but history of mainshaft unknown.
    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
Front Centre
Rear
Front
Rear
Front
Rear
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 -

 
 
 

NOTE
These pages are best viewed at a screen resolution of 1024 x 768 pixels 
using Nestscape Navigator 4.0 or better. 
They can be only viewed with a 'frames' compatible browser.

If any of these subjects are of interest, please  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.

© Mike Munro
This page last updated on 19th August 2003