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Auto transmission lockup ?

Posted: Sun Feb 18, 2018 11:27 am
by Jumboshrimp
Hello to all of the awesome Delica owners out there!

I have a 92 Chamonix automatic. I notice that at certain speeds in 3rd gear the lockup converter will engage. when the O/D off button is pushed the trans will not lockup.

So my question is how can I make it lockup with O/D off? I think this would help lower rpm's when O/D is not being used.

any help/input is greatly appreciated!

Auto transmission lockup ?

Posted: Sun Feb 18, 2018 3:54 pm
by Growlerbearnz
Short answer: you can't.

Disabling O/D also disables TC lockup, and that behaviour is designed into the hydraulic control "brain". In theory you could modify the hydraulic control circuits to achieve anything you wanted, but the system is far more complicated and finely-tuned than anyone thinks, and modifying it is fraught with unintended consequences.

How intimidating is this?:
ATcontrol.PNG
ATcontrol.PNG (256.1 KiB) Viewed 3936 times
Volvos use the same transmission and there's a healthy FAQ on the Volvo page here, including a guide to some modifications of the control circuits: https://www.volvoclub.org.uk/faq/TransmissionAuto.html

There's a downloadable AT workshop manual here: http://www.delica.ca/forum/viewtopic.php?f=115&t=7347

Auto transmission lockup ?

Posted: Sun Feb 18, 2018 8:06 pm
by Jumboshrimp
That’s what I was afraid of.
Darn
I knew you would have the answer !

More like “Gurubearnz”!

Cheers