Vibration in 6th Gear

My 2009 diesel auto FL2 has a transmission vibration that is most apparent when in 6th gear with engine under load, such as when driving up a hill. As soon as gearbox changes to 5th gear, or when the road levels out, vibration ceases.
My Land Rover dealer cannot find the cause, although their thinking is towards a software issue that controls conditions under which the gearbox changes?
Any thoughts?

Hi,

I had/have the same problem on a FL1 when the box needs to change from 5th to 4th.

A change of ATF made a huge improvement - didn't totally eliminate it, but now it happens much less often, and is only a slight 'flutter' before changing down.

Singvogel.

If it is a permanent fault and you are able to demonstrate it to them. Then they have to sort it. No two ways about it.

If they havent asked you to demo the fault to them, then you need to be telling them your going to demonstrate the fault.

Once they have seen the fault (if indeed there is one), then they have to sort it.

If they give it you back without being able to tell you specifically how they are going to progress into rectifying the fault. Then you need to contact Land Rover Customers Services and explain your issue to them.

Customer Services will then bollock the Dealership until it gets sorted




Always easier said than done, but thats the process it tends to how through for hard to fix faults.

Last week my FL2 was again booked in with the dealer to try and solve the noise/vibration that was evident mostly at 2000 rpm when the transmission was placed under load. At one stage the propshaft was removed and this totally eliminated the noise so the dealer came to the conclusion that it was either the Haldex unit or the diff itself that was faulty. The pinion bearing in the diff was selected as the most likely fault and was replaced - but the noise remained.
In a last ditch to solve the problem, my older rear tyres were swopped for my newer front ones. Problem solved! No noise, no vibration.
I know that unequal tread depth was considered a problem for FL1, but FL2?

FL2 is just as sensative because of how the Haldex works.

There is also a current symptom that is coming through on FL2 auto. Its kind of rare, but if a customer has had a software update to the TCM in the last 6months or so, then it has had some modified shift strategy loaded onto it.

It can cause what is normally described as a vibration, but its more of a resonation through the car. It is normal and Land Rover say that its as good as its going to get.

Its normally experienced when labouring up a hill, but ive not experienced it myself.

Thanks Vissie.

What you described is exactly my experience - a resonating sound especially when travelling uphill.