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NothingFace · 05-18-2018, 09:00 PM

Hey guys

I have a Citroen ZX with a 4 speed automatic gearbox, it is a ZF 4HP14 completely oldschool hydraulic control, no ECU.

The transmission shifts into 4th at about 70 Km/h but it can mantain it down to 60km/h, I was thinking of finding a way of making it shift up sooner.

Should I be loking for a vacuum line to tap into ? or adjust the kick down cable a different way? (maybe its not just kickdown)

Or is it really a no go and only real way to do it would be to change the valve body ? (Wich obviously is not practical).

Thanks for the help

05-18-2018, 09:00 PM	#1 (permalink)
NothingFace EcoModding Lurker Join Date: Aug 2014 Location: Portugal Posts: 19 Citroen AX 1.5d - '93 Citroen AX Diesel 90 day: 61.42 mpg (US) Thanks: 3 Thanked 3 Times in 2 Posts	How to mod hydraulically controled AT ? Hey guys I have a Citroen ZX with a 4 speed automatic gearbox, it is a ZF 4HP14 completely oldschool hydraulic control, no ECU. The transmission shifts into 4th at about 70 Km/h but it can mantain it down to 60km/h, I was thinking of finding a way of making it shift up sooner. Should I be loking for a vacuum line to tap into ? or adjust the kick down cable a different way? (maybe its not just kickdown) Or is it really a no go and only real way to do it would be to change the valve body ? (Wich obviously is not practical). Thanks for the help __________________