gundog1

New Member
Hi, I wonder if anyone can help.......
Discovery 2 auto, Sometimes when I select reverse gear I get a "clonk" noise, not everytime though. is this anything to worry about?
Thanks in advance. Paul :confused:
 
Hey there

My First TD5 had that problem it was the rear diff, you should jack it up and take the rear diff back plate off and have a look at the crown wheel for cracks etc as this may need replacing, also take a look at the U.J. coupling and pinions on the prop-shaft, our TD5 had two diffs one on the day we bought it!!! hope its only the one for you
 
Dont know about Disco 2 but my Disco 1 auto clonks when I select reverse.Its the splines on drive shafts in transfer box that get worn that cause it.Some people say they had same problem for years .One day there will be a big clonk and the wheels wont go round.Splines completly worn out.Then is a good time to mend it.:D
 
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

Detail:
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".
 
Dont know about Disco 2 but my Disco 1 auto clonks when I select reverse.Its the splines on drive shafts in transfer box that get worn that cause it.Some people say they had same problem for years .One day there will be a big clonk and the wheels wont go round.Splines completly worn out.Then is a good time to mend it.:D


Yes 22 years... Dont think it's wear I have had it from day one on both my disco and previous RRC. When Land Rover fitted a Borg Warner transfer box with a viscous coupling to the RRC in 1988 the clonk was gone, sadly this transfer box was never carried over into the disco.
 
Just seen this thread 'cos I was looking (!) for answers to the CLONK when I select reverse and then give it some welly on my Disco2 auto box.
Sounds like an expensive job, The Mad Hat Man, Any ideas of the cost anyone?
 

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