A500/A518 Cars, OD and L/U on a toggle or auto?
I didn’t see the option for what I wanted so I put together my own kit.
I used adjustable pressure switches with rocker switches mounted in my shifter base.
When the toggles are both on it shifts fully automatically.
With the switches both off it shifts 1-2-3 and stays there.
Adjustable pressure switches allow speed adjustments and not just two set speeds like the PATC kit.
I have mine set right now so OD comes on about 50mph and lockup about 65.
Since the adjustable pressure switches are a little pricey I set up relays to do the electrical load switching.
The rocker switches disable the relays ground so it bypasses OD and lockup.
With the 4th gear switch in the auto setting it shifts 1-2-3-4 only.
With both in auto, it shifts 1-2-3-OD-lockup.
With only the 5th switch on it shifts 1-2-3—then lockup at 65.
In my experience you don’t need a brake switch interrupt.
When your speed drops below the pressure the switches sense, it drops out of OD or lockup anyway.
These pics were taken on Interstate 40 in AZ a week or so ago.
I have a 3.55 sure grip 8.25 rear end and this was in OD with lockup.
The part number in the picture is the 30-70lb adjustable switch from NX Express.
I didn’t see the option for what I wanted so I put together my own kit.
I used adjustable pressure switches with rocker switches mounted in my shifter base.
When the toggles are both on it shifts fully automatically.
With the switches both off it shifts 1-2-3 and stays there.
Adjustable pressure switches allow speed adjustments and not just two set speeds like the PATC kit.
I have mine set right now so OD comes on about 50mph and lockup about 65.
Since the adjustable pressure switches are a little pricey I set up relays to do the electrical load switching.
The rocker switches disable the relays ground so it bypasses OD and lockup.
With the 4th gear switch in the auto setting it shifts 1-2-3-4 only.
With both in auto, it shifts 1-2-3-OD-lockup.
With only the 5th switch on it shifts 1-2-3—then lockup at 65.
In my experience you don’t need a brake switch interrupt.
When your speed drops below the pressure the switches sense, it drops out of OD or lockup anyway.
These pics were taken on Interstate 40 in AZ a week or so ago.
I have a 3.55 sure grip 8.25 rear end and this was in OD with lockup.
The part number in the picture is the 30-70lb adjustable switch from NX Express.
