One point I did not mention in my post was that I have also found that the 4WD Low function does not seem to work. If switched to on then the 4WD Low lamp just flashes constantly. Possibly related so I mention it just in case. Thanks.

 

Welcome Martin.

 

The juddering is almost always related to the TOD transfer case.Pull the Transfer case fuse, I think it is nr 13 in the footwell, the dash will light up but that is nothing, take a drive and feel if it is driving normal.
If that fixes the problem, you might want to consider building and installing the "super locker". This basically gives you the control over the clutch in the transfer case.

Send me your email, I will drop everything I have on the super locker in your inbox.

I built and installed it on my 07 and it works 100%.

 

Thanks for that Marius. That may be the way I have to go. I am just a little suspicious that the onset of the "juddering" and the 4WD Low lock not working came about the same time and therefore wondered if there is any relationship to these two events. I can find no real reference to the significance of the 4WD Low icon blinking constantly, although I must assume perhaps that it means the transfer clutch has not locked. Can't seem to find a PM function on this forum so mail me at martin@[my username].co.uk (just a precaution against the spam bots).Edited by: malegg

 

are the tyres a matching set including ply rating, it does not take very much wear on these for the TOD to start cutting in giving you the symptoms you are getting, if it is ok with the fuse out then have a good look at the tyres, they rely on all of the tyres having identical rolling radius,

 

Thanks Andy. I have considered the matter of the tyres previously but dismissed it as a new "set" of tyres was fitted to the vehicle shortly before I purchased it. However, I do now note that, although the tyres look identical, style, tread pattern, the actual brand of the front two does not match the rear (rather like the same tyre marketed under different names). Perhaps I'll try and measure the rolling radius with a calliper. I may have to bite the bullet and try a complete new set to either prove this, or, rule it out! There is probably a good reason, but, I have difficulty understanding, if this is the case, why the TOD does not exhibit any problem under acceleration, i.e under max load. Many posts I've read speak of this as the most frequent symptom. I'll certainly give the tyres a very close examination this weekend. Many thanks indeed.

 

Take each wheel of and measure the circumference, the largest two need to be on the rear As said different makes have differing side wall construction which will also play a part, that is why best kept to four matching.

 

The 4wd light blinking means that the TCCU (transfercase ecu) is picking up a problem. Mine blinked like this while I was busy installing the superlocker and the wire to the clutch was cut.

 

Thanks Birdman. That makes a lot of sense to me as an initial step.

 

Thank you once again Marius. The 4WD lamp only blinks when I try to engage 4WD Low. It is as far as I know supposed to blink for a moment and then remain on to show lock, so, something is wrong there. The superlocker you mentioned could well be how I go ultimately providing nothing else too serious is wrong. I am however surprised that a simple way to just turn off the TOD was never built in! Quite an oversight really.