ESOF and solid axles
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ESOF and solid axles
Did a search and could not find anything regarding this.
Ive got a 97 f150 with a solid axle swapped in. I somehow did not take into account the 4x4 system as I built this for a friend 15years back as a show truck. It is now mine and im turning it into a trail rig.
Ive got no abs, no vacuum actuators, manual locking hubs so its a given that my esof does not work. Ive got the shift motor rigged to a power window switch to allow me to shift from 2h to 4L but as you can imagine, 4h is a bit difficult to find. The dash lights do not work. Anyone know a way to trick the system so my switch works or should I just buy a floor shift and all associated hardware? Any other methods/suggestions are welcome too. Thanks
Ive got a 97 f150 with a solid axle swapped in. I somehow did not take into account the 4x4 system as I built this for a friend 15years back as a show truck. It is now mine and im turning it into a trail rig.
Ive got no abs, no vacuum actuators, manual locking hubs so its a given that my esof does not work. Ive got the shift motor rigged to a power window switch to allow me to shift from 2h to 4L but as you can imagine, 4h is a bit difficult to find. The dash lights do not work. Anyone know a way to trick the system so my switch works or should I just buy a floor shift and all associated hardware? Any other methods/suggestions are welcome too. Thanks
Hotshot
Joined: Jul 2005
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drawing above is from a different FORD truck, but appears you need a two position switch or two switches to do two functions........ how can you do it with one ?
also,, im not sure of the wiring, but isn't there a position switch on the case that the harness plugs into also ? I assumed this help determine when the motor movement stopped ?
also,, im not sure of the wiring, but isn't there a position switch on the case that the harness plugs into also ? I assumed this help determine when the motor movement stopped ?
Lead Driver
Joined: Sep 2006
Posts: 7,907
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You need only to find the leads out of the case motor that signal position to the GEM in the original installation schematic, then use them to light your indicator lights.
The case motor only has two positions.
A push button switches would be the easiest so you can stop the power when the position is reached.
Reversing is a matter of changing polarity to the motor with one of the switches.
In the schematic the relays 378 and 379 do this reversing so must work together in that circuit configuration.
Otherwise you wire to do the same function with switches.
In a non modded truck all you would do is pull a front solenoid connector off to have the rear go into low range without the front.
.
If it makes any difference to you, in a stock setup the case motor in 4L also sends a signal to the PCM to change shift points vs engine speed.
Otherwise the motor will wind to the moon before the trans shifts because it does not know any different without the 4L signal.
Also, do not try to engage Low range while moving for safety and reliability.
At least stop the truck to make the change and signal the PCM of that change so the shift schedule changes with it..
Think it through and make the right manual control system decisions and it should work out..
Good luck.
The case motor only has two positions.
A push button switches would be the easiest so you can stop the power when the position is reached.
Reversing is a matter of changing polarity to the motor with one of the switches.
In the schematic the relays 378 and 379 do this reversing so must work together in that circuit configuration.
Otherwise you wire to do the same function with switches.
In a non modded truck all you would do is pull a front solenoid connector off to have the rear go into low range without the front.
.
If it makes any difference to you, in a stock setup the case motor in 4L also sends a signal to the PCM to change shift points vs engine speed.
Otherwise the motor will wind to the moon before the trans shifts because it does not know any different without the 4L signal.
Also, do not try to engage Low range while moving for safety and reliability.
At least stop the truck to make the change and signal the PCM of that change so the shift schedule changes with it..
Think it through and make the right manual control system decisions and it should work out..
Good luck.
Thread Starter
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New User
Joined: May 2016
Posts: 3
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You need only to find the leads out of the case motor that signal position to the GEM in the original installation schematic, then use them to light your indicator lights.
The case motor only has two positions.
A push button switches would be the easiest so you can stop the power when the position is reached.
Reversing is a matter of changing polarity to the motor with one of the switches.
In the schematic the relays 378 and 379 do this reversing so must work together in that circuit configuration.
Otherwise you wire to do the same function with switches.
In a non modded truck all you would do is pull a front solenoid connector off to have the rear go into low range without the front.
.
If it makes any difference to you, in a stock setup the case motor in 4L also sends a signal to the PCM to change shift points vs engine speed.
Otherwise the motor will wind to the moon before the trans shifts because it does not know any different without the 4L signal.
Also, do not try to engage Low range while moving for safety and reliability.
At least stop the truck to make the change and signal the PCM of that change so the shift schedule changes with it..
Think it through and make the right manual control system decisions and it should work out..
Good luck.
The case motor only has two positions.
A push button switches would be the easiest so you can stop the power when the position is reached.
Reversing is a matter of changing polarity to the motor with one of the switches.
In the schematic the relays 378 and 379 do this reversing so must work together in that circuit configuration.
Otherwise you wire to do the same function with switches.
In a non modded truck all you would do is pull a front solenoid connector off to have the rear go into low range without the front.
.
If it makes any difference to you, in a stock setup the case motor in 4L also sends a signal to the PCM to change shift points vs engine speed.
Otherwise the motor will wind to the moon before the trans shifts because it does not know any different without the 4L signal.
Also, do not try to engage Low range while moving for safety and reliability.
At least stop the truck to make the change and signal the PCM of that change so the shift schedule changes with it..
Think it through and make the right manual control system decisions and it should work out..
Good luck.
So far the engine has been shifting ok on low range. Just wished I could go 4hi on some occasions. 4lo and 5.13s just get too slow at times.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
I don't know what you have now, but reversing the motor leads will run the case motor backwards to 4H and to 2wd.
.
You should be awhere that going from 2wd to 4H involves an electric clutch to allow shift on the fly so gears don't grind. This is not often spoken about.
.
Take the case motor down, look at the circuit board to help figure out the signal and control functions the wiper contacts do and run the motor to verify..
Mainly the DC power to the motor is controlled from relays under the dash.
The signal functions are done on the motor board for operation of the firewall solenoids and signals back to the GEM.
Volt/Ohm meter will help verify what you need to know.
.
You should be awhere that going from 2wd to 4H involves an electric clutch to allow shift on the fly so gears don't grind. This is not often spoken about.
.
Take the case motor down, look at the circuit board to help figure out the signal and control functions the wiper contacts do and run the motor to verify..
Mainly the DC power to the motor is controlled from relays under the dash.
The signal functions are done on the motor board for operation of the firewall solenoids and signals back to the GEM.
Volt/Ohm meter will help verify what you need to know.
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