Thread: ZF Auto

Have a look at this site.
If I recall from last time I read it, it is something to do with a spring clutch inverting. You can start in first but not drive.
www.ashcroft-transmissions.co.uk/
regards philip A

if the transmission fluid is the right level and colour (not burnt)
it sounds like torque converter or valve body.
it might have just been a stuck valve in the valvebody after the workout?




if its working ok now it may be impossible to diagnose till it becomes permanent.

From ashcroft FAQ
I have a 4sp ZF, when I select "D" the vehicle won't move, when I select "1" the vehicle moves off. I can then select "D" and continue to drive normally. If I stop I have to start in first again. Why?

A sprag clutch has "inverted" and will need replacing. No further damage will occur if you continue to drive but you will need to select "1" every time to start moving. A rebuild is required to correct this.
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When I start my Automatic Range Rover in the mornings it takes a while to engage drive, it hasn’t always done this. This has become worse in the cold weather. Why?

It sounds like you need to change the filter! In the cold weather, i.e when the oil is cold and more viscous, if the filter is partially blocked it will take some time for the pump to draw oil through it. Once the oil becomes warm it flows more freely and can pass through the filter more easily. Hence the problem only occurs when the oil is cold. To remedy this problem your filter needs to be changed. This should be done sooner rather later to reduce the possibility of damage to the autobox, by the clutches “slipping” during this slow engagement.


Regards Philip A