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Discovery 300 TDI auto gearbox kicking down on change up


avocado-pip

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Hello

My 1998 Disco 300 tdi automatic has a problem only when changing from 2nd to 3rd it kicks down, no slipping, when speed builds up changes into 3rd gear and then 4th gear as normal.

No problem with any other changes.

Has covered high mileage and is original

 

Any thoughts please would be helpful

 

 

Thank you

 

 

Phil

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‘Kick down’ is where the gearbox can drop a couple of ratios at a time if necessary and is different to the normal dropping down a single ratio one at a time. 

Anyway it seems like your describing what is called ‘flare’ which is more than likely a fault with the box. But a fluid and the filter screen replacement may help, depending on when it was last done.

There lots of info in the LR workshop manual which can be down loaded from various sites and worth having a copy.
Below is a cut & paste of what the manual states on the symptom 7 which appears your gearbox has. 

SYMPTOM 4 - Slip in all forward gears

Carry out main line pressure check

oe No pressure

FAULT - Blocked filter or pump failure

oe Low pressure

FAULT - Restricted filter or sticking primary

regulator

oe Normal pressure

FAULT - Clutch ’A’

SYMPTOM 5 - Harsh engagement ’N’ to ’D’

Check engine idle speed

Carry out main line pressure check

oe High pressure

FAULT - Primary regulator stuck

oe Normal pressure

FAULT - Clutch ’A’ or damper for clutch’A’

SYMPTOM 6 - Fierce shift or flare 1st to 2nd shift

Check engine idle speed

Carry out mainline pressure check

oe High pressure

FAULT - Continue with symptom 5

oe Normal pressure

FAULT - Modulator valve or dampers for

clutch brake CB1 and/or clutch brake CB2

FAULT - Clutch brake CB1 and/or clutch

brake CB2

SYMPTOM 7 - Fierce shift or flare 2nd to 3rd

Carry out mainline pressure check

oe High pressure

FAULT - Continue with symptom 5

oe Normal pressure

FAULT - Modulator valve or clutch ’B’ damper

FAULT - Clutch ’B’

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