Thread: Discovery TD5 Automatic transmission lockup

Greg,

It would appear that Discoveries are set to finally lock up about 82.5- 85 kms/h. [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]
The reason that this is because the factory did not want the engine to snatch or shudder at lower revs

This is governed by the program in the ATC under the passengers seat.

My disco locks up at 83kms/h depending on foot throttle position.
To change this requires reprograming of the computer. :roll:

I understand that our friends at "Davis" at Annangrove (Brett the wizard) is going to attempt to reprogram the transmission computer.
So till you get the computer re flashed enjoy driving it. [img]style_emoticons/<#EMO_DIR#>/tongue.gif[/img]

Cheers Aston

Astron

Thanks for your comments

Of bigger concern to me is why it unlocks when going up hill at 100 KPH without changing down, and the amount of torque converter slippage.

Apart from that its a brilliant vehicle.

Thanks

Greg

Try it in "sport mode". They change down earlier and hang on longer.
Trev.

Greg-g you have taken the words right out of my mouth and I too believe the transmission set up could be a lot better. Basically as I see it the transmission should change up earlier with light throttle response. Since I have had the ECU upgrade that does help the transmission shifting to a degree as you usually have a lighter foot. If you find out some way of reprogramming the Transmission ECU let me know.

Nice thread here. I have a 2003 Land Rovery Discovery HSE TD5. Both my old man and I have also found the torque converter to be slipping far more than we would have expected. Glad to hear it's a thing with this model rather than an issue of concern with my particular vehicle.

Hi the problem you have is primarily caused by the 'small' converter which is fitted to the TD5, in a stock TD5 'small converter' its just about big enough but constantly slips and causes overheating, if 'god forbid' you need to pull the box out for repair then you should ask your auto box specialist to install the medium sized converter, this will generate less heat and it has a much larger clutch so less likely to slip. For further info see here.
Ashcroft Transmissions - ZF4HP22

Regards Ian Ashcroft

as Ian mentioned the bigger converter will lower the slip and revs but we have not looked at reprogramming the ecu, instead we supply the compushift :

Ashcroft Transmissions - COMPUSHIFT

Dave

Originally Posted by ashtrans

as Ian mentioned the bigger converter will lower the slip and revs but we have not looked at reprogramming the ecu, instead we supply the compushift :

Ashcroft Transmissions - COMPUSHIFT

Dave

Is the larger torque converter a better option than the COMPUSHIFT though?