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Thanks, this explains how and why you dont need to put in a power steer box, if the valve goes in the drag link, just like the air-o-matic system. The primary vehicle is a Jag Mark 1 which has had a bigger/heavier engine fitted. Unfortunately, there is no drag link, as the Pitman arm attaches...

Ok thanks - but what is used to send the "signal" to the pressuriesd fluid to go to the assist ram if the old steerig box is being used - don't you need a steering box with the valves in which are opebed when force at the rim exceeds a certain amount?

Thanks Comd - I am trying to avoid fitting a new steering box though, as it is a classic etc etc

G'day from Brisbane Australia. I am trying to keep my elderly father driving and want to fit air assist steering to an old car for him. Can anyone please supply an old Air-O-Matic torque valve so I can copy and make a smaller one. Doesn't matter if it is worn out, only needs be complete...