4x4/transmission specialists in Edinburgh

[Tophatron]

Hi,

My OH's 2004 Jeep Grand Cherokee is making a bit of a noise when under load around 40-50mph. The noise is only present when you are accelerating, it goes away as soon as you take your foot off the throttle. I guess it could be the diff, transfer case or even the auto gearbox?

Does anyone have any recommendations of specialists in the Edinburgh area who might be able to diagnose it?

Cheers for any help.

[andylamb]

alex lindsay is a landrover guy in east mains industrial estate
Axwel House, Westerton Road, East Mains Industrial Estate, Broxburn, West Lothian, Scotland
Telephone: [phone]

keith elgin

Address
Keith Elgin Motor Engineers,
36 Canaan Lane,
Edinburgh,
EH10 4SU

Telephone
0131 447 1301

[Lastinclass]

Jeep's are a bit notorious for diff noise. Not so bad now as the old XJ Cherokee's were...

You will need someone pretty specialist as the casing needs to be measured as you spread it in order to get the right bearing preload. Same with the pinion bearings, they need to be measured for rotating torque levels as they are preloaded by a collapsable spacer.

I've done a good few but I'm in the North East.

[Tophatron]

Thanks for the replies. At the moment all I can hear is a slight noise, mainly because I'm so used to how it was before.

I wonder if it is the sort of thing I should fix asap, or should I continue driving it to see if it gets any worse? Is that likely to do more damage/cost more that way, or just get easier to diagnose?

[Lastinclass]

Get the front and rear diff and transfer box oils changed first. Make sure there's no lift in the pinions and if it's not howling leave it a while unless there's a lot of traces of metal in the oil when it gets drained.

[Tophatron]

Lastinclass said:

Get the front and rear diff and transfer box oils changed first. Make sure there's no lift in the pinions and if it's not howling leave it a while unless there's a lot of traces of metal in the oil when it gets drained.

Cheers, changed the front diff oil already (side note - the price for the oil is ludicrous) and it was clean so will probably do the transfer case one next. It sounds like its coming from the front, but that might be my imagination.

[Lastinclass]

Very rare to get transfer box noise, it's just a big chain in there. If the noise alters as you come on and off the throttle it'll be a diff. I've done front's and rear's....

[Tophatron]

Lastinclass said:

Very rare to get transfer box noise, it's just a big chain in there. If the noise alters as you come on and off the throttle it'll be a diff. I've done front's and rear's....

Thanks, I'll do the rear diff next. Think it's worth changing the gearbox oil too?

The noise basically comes on about 40ish mph when accelerating, but stops as soon as I come off the throttle.

[Lastinclass]

Is it a diesel? if so it's a MB gearbox to go with the engine. Never seen a problem with that 722 series box but you never know. You need a special dipstick to check the gearbox oil level as the car doesn't have one fitted. Sounds more like you have diff pinion bearing noise though.