Sticking in gear

[gra1]

Hi I have a 2003 L322 Range Rover. Over the last 12 months or so my Range Rover decides to stick in gear usually 2nd hence reving rather high at 50 - 60 mph. To uaually remedy this I pull over and switch the engine off for 2 to 3 minutes. Restart the engine and then it is back to normal changing gear correctly. Today it seems to be doing it more than usual.

Is this a commom fault or is there a remedy to stop this totally occuring.

Does anyone else have this problem?

Graham.

[CMJ]

Graham

Been there had that.

See thread here

http://www.pistonheads.co.uk/gassing/topic.asp?h=0... V8 Vogue gearbox "sticking"

[andyb66]

Make sure you get a proper flush rather than just a fluid change.

[bozmandb9]

Get it done immediately, you'll be lucky if you're not in for a full rebuild if you've had this issue for 12 months!

Best to get the oil changed twice, they can't get it all out of the torque convertor. Make sure that you take it to somebody who's done/ doing lots of them, so they get it right, and make 100% sure that they use exactly the right fluid.

[andyb66]

bozmandb9 said:

Best to get the oil changed twice, they can't get it all out of the torque convertor.

This is why I suggested getting it flushed with new oil rather than getting done what most garages will call an oil change.

[bozmandb9]

andyb66 said:

This is why I suggested getting it flushed with new oil rather than getting done what most garages will call an oil change.

So far as I'm aware nobody can effectively flush all of the oil especially from the torque convertor.

[paintman]

Not without removing it from the vehicle.
Your method is commonly suggested as the best way of changing most of it.

[andyb66]

bozmandb9 said:

So far as I'm aware nobody can effectively flush all of the oil especially from the torque convertor.

Not even using the oil cooler pipes as pickup and drain? One in a fresh barrel of ATF the other in an empty barrel? Just checking that my method for flushing an auto box works the way I think it does?

[paintman]

andyb66 said:

Not even using the oil cooler pipes as pickup and drain? One in a fresh barrel of ATF the other in an empty barrel? Just checking that my method for flushing an auto box works the way I think it does?

[andyb66]

paintman said:

You obviously don't need to use it all, but it will need about 20% more than the capacity of the gearbox. The barrel is just to ensure that you don't 'run dry'.

I assume that you have no problem with the method as being a suitable way of flushing an autobox?

[Texpis]

When you guys are referring to ATF you mean LT71141 do not use standard ATF! Sticking in gear is a symptom of the oil overheating this is usually because the radiator bottom half that cools the gearbox oil is blocked. there is a test on the flow of water from the bottom drain of the radiator. Land rover garages replace the radiator if it fails the test.

Mick

[andyb66]

Texpis said:

When you guys are referring to ATF you mean LT71141 do not use standard ATF!

Mick, you are indeed correct.

My experience of ZF autoboxes sticking in gear is often due to blocked governer on the back of the box.

When you say overheating oil causes sticking in gear, do you mean that clutch packes 'bind'?

[Texpis]

Hi Andy
The sticking in gear is feature of the gearbox, when the oil overheat it sticks in a lower gear to keep the input revs and so oil pump at a higher revs so flowing the oil around the system quicker. The blocked radiator is a weak spot of the gearbox cooling system with no easy way to flush.

Hope that make sense Mick

[andyb66]

Texpis said:

when the oil overheat it sticks in a lower gear to keep the input revs and so oil pump at a higher revs so flowing the oil around the system quicker.

Ah yes of course, ECU controlled box with a fluid temperature sensor.

Yes perfectly clear. Thanks Mick

[gra1]

Hi guys a little late on coming back on my Topic. I am going to change the radiator on my L322 this week to stop the gears from stcking due to the over heating problem. Would I need to do a engine flush to get rid of any additional sediment lurking around etc.