Rover 75 / ZT 2/4 Brake Duty Solenoid - Automatic Transmission. JF506E
After a lot of searching, we've found a reliable supplier for the 2/4 Brake Duty Solenoid as used in the Rover 75 / MG ZT Automatic models (all engines - 1.8, 2.0 and 2.5, petrol and diesel).
2/4 Brake Duty Solenoid failure is characterised by harsh gearchanges. In the past this fault would require an exchange of the transmission unit, however you can now change this item in around 1 hour and have full function restored.
In the 2nd image, there's a useful guide to finding out if the 2 / 4 Brake Duty Solenoid is your issue.
Test the resistance between pins as indicated, and you should find the cause of your issue.
These are brand new parts, and warranted for 3 years.
Full guide to changing this part here: https://the75andztclub.co.uk/forum/showpost.php?p=1727628&postcount=4