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Discussion Starter #1
Have had this noise on hard acceleration from standstill in first gear for about a year now, sounds a bit like a louder engine roar/grinding noise (difficult to describe!) and cuts in and out sharply, depending on how much welly I give it, and it seems to be getting worse. Gear shifting appears to be jerkier too.

When it was in the local Stratstone dealership recently for some work I had the Service Manager ride in the car with me and he just about heard the noise, (car was on good behaviour that day) but later he told me he heard a rattle on start up when it was in the garage and thought it could be the plate that holds the torque convertor breaking up.

Anyone experienced this? The service chap seemed to think that when it goes there would be a loss of drive, but I'm a bit concerned it might stuff the box at the same time. I have Warranty Direct cover but I doubt they are likely to pay for exploratory work, so wondered if this was a common fault.

Any advice would be much appreciated,

William
 

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Does it definitely only make the noise in 1st gear and not 2nd? I believe the torque converter lockup clutch only operates in 3rd, 4th & 5th gears on the 5L40-E transmission so I was wondering if the problem could possibly be related to the converter when it's open.

Phil
 

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Discussion Starter #3
Er... As far as I can recall, it's only when I accelerate hard, like from stationary on a roundabout when there is a 38 tonner bearing down on me...
So I would say first gear only, but I'm avoiding driving like that for the moment for fear of something going bang!

William
 

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Phil, can confirm that the noise occurs in second gear as well. Just took it for a spin and took off in sport mode with it in second. Couldn't hear anything for third, but it only occurs in that 'slingshot' effect the the torque convertor gives when taking off from standstill when there is obviously a lot of torque going through the transmission.

William
 

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William,

I’m sure you appreciate that it’s very difficult to diagnose faults at a distance. There’s a number of areas of the driveline where the noise could potentially be coming from (engine, transmission, transfer box, propshafts, final drives, driveshafts, etc.)

Here’s some facts though :

The torque converter for the GM 5L40-E transmission is a well known weakness.

If you did replace your torque converter there would be no need to use a specialist to do this work (as there’s no requirement to venture into the transmission itself) and any competent mechanic should be able to remove & replace the transmission from your Range Rover and swap over the torque converter.

Land Rover ask an eye watering £1750 for a replacement torque converter. I’ve just been quoted £315 for a new OEM unit by these guys : http://www.sussexautos.co.uk/

At £315 plus (say) £40/hour for labour you should be able to replace your torque converter for around £500.

Obviously a fluid & filter change at the same time would make a lot of sense.

In the event of this not turning out to be the fault, and you then moved on to having your transmission rebuilt/repaired, then you would have been unwise not to replace the torque converter at the same time anyway due to its well known durability issues. So basically only the labour cost would have been wasted.

I think that would probably be my recommendation – but that’s easy to say when it’s not my money :)

Phil
 

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Discussion Starter #6
Phil, many thanks for your thoughts. Certainly at that price it makes sense to replace the torque converter and see if that cures it. I have a hunch that the noise is emanating from the TC, so maybe I'll seek out a local independent mechanic. Shocking what Land Rover charge, although I am covered with Warranty Direct for main dealer repairs. Maybe I'll see how the fault progresses since I don't clock up many miles in the car, just so long as if the TC goes it doesn't damage the gearbox.

Cheers,

William
 

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Discussion Starter #8
Yes, had that done in June '08, diff had failed in June '06 at 9pm at night when we were 230 miles from home. Didn't get back home till 3.30 am in the recovery truck /:(
 
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