Fred Dushin Ben Smith Dale Desprey Bill Maloney Bruce Fowler Dave Bobeck Dixon Kenner Alan Richer Mike Loiodice
BBC Top 
Gear Land Rover vid 5mb Part of a series where people picked their 
favourite car for an 'all-time' greats poll. The Land Rover won hands 
  Vehicle Identification  
  History, Production, & Sales 
  Repair & Maintenance
96 US/CDN Specs
OBDI Fault Codes
Forward Control
  Clubs & Parts Suppliers
What's New
  Contact Us
  Return to OVLR
  Return to Rover Web

Discovery Drivetrain Clonk

[Don't ask where I got this, I'm just passing on information -Ben]

At long last I got a copy of the LRNA bulletin covering drive line clonk in Discoveries and Defenders. My original source never got back to me so I had to go elsewhere. For the record, no, I won't fax you a copy. I've been admonished not to "show" it to anyone. By the way, this problem exists in both manual and automatic transmissions as the bulletin lists replacement part numbers for both.

Here are the salient parts:

Bulletin No: 37/20/96
Subject: Gearbox Mainshaft Spline Wear
Affected Vehicles:
    Discovery LJ 178205 onwards
    Discovery LJ 506525 onwards
    Defender LD 976480 onwards

    Some customers may complain of clonks and backlash in the transmission system. This may be due to gearbox/mainshaft spline wear. The clonk/backlash will be most apparent in stop/go traffic under overrun conditions or when maneuvering the vehicle during parking, etc. From transfer box number 28D 460996 F (Discovery) and 22D 461124 F (Defender) all factory built LT230 transfer boxes have a revised design of input gear, featuring lengthened splines and cross drilled oil feed holes. This modification eliminates the requirement for an oil feed disk (bulletin H415) and eliminates input gear/mainshaft spline fretting/wear. Coincident with this change, the transfer box identification number has been raised to Suffix "F".

Copyright Dixon Kenner, 1995-2011. Last modified March 15, 2005.
Comments? Send mail to Dixon Kenner or Benjamin Smith
Site Designed and Created by Bill Maloney
Russ Wilson
Russ Dushin
Tom Tollefson
Steve Denis
Don Watson
Fixing It
Ted Rose's Buns
Andy Grafton