Here is an Email that a member sent me regarding unhooking the TPS and using a potentiometer in its place. It is a fairley straight forward prrocedure. Instead of a 10 turn pot, I used a one turn. I can set the pointer anywhere between the 9 oclock and 1 oclock locations. I crank the dial up when towing so it shifts a little later and turn it down for everyday driving so it shifts sooner.
Stan
Use a cable that is 18 gauge three wire and is shielded and suitable for outdoor use. The cable should have three wires colored red, black and white and has a bare wire wrapped with it and covered with some tin foil and PVC outer cover. Should be available through radio shack or electric wire
distributor. The bare wire is not used so cut it back.
The pot was a 5K ohm, ten turn, 1/2 watt, you can go to 1 watt but it will
just be a little heavier duty. (look at my comments above about a one turn pot - Stan ) You can mount the pot on the dash at a convienient location. It can be in a small project box, in the panel where the OD switch is located, in the message center area, etc. Look on the side if the pot and you will see a diagram and it shows the terminals, 1, 2 and 3. On the pot the two terminals closest together are 1 and 2 with 2 being the terminal closest to the knob end and 3 is the terminal located at the end of the pot and rotated down from the other two.
I used fully insulated connectors, male and female to do the hook up. I pigtailed the pot so if it ever goes out I could change it out easily. I used the following colors: Black to terminal 1, white to terminal 2 and red to terminal 3 on the pot.
I ran the cable up front and cut the connector to the TPS leaving enough
wire so I could re-hook TPS up again if I need to. The connectors have to be
opposite of the type you are using on the cable to reinstall the TPS if
needed.
I connected the black wire to the black wire, the white wire to the orange with dark blue stripe and the red to the violet with white strip.
Most pots are clockwise rotation meaning the more you turn the knob CW, the
higher the voltage. To set the voltage unhook the white wire in the new cable from the orange with dark blue stripe and hook red lead from VOM to the white wire connector and adjust the voltage you want. .7 volts is what I
set mine at.
One thing I want to remind you about, the tranny will not drop into passing
gear (out of overdrive) when you are really getting on it, you will have to
push the button to make it do that if you are in a hurry.
The controller is seeing a voltage that does not vary but the more or less
voltage you crank into the signal line (orange with dark-blue strip) will vary the shift point some what. The more fuel I give my truck the higher MPH it shifts into OD. Just depends how yours is set up. Normally with very light throttle it shifts into OD about 37 to 40 and allot of throttle about 50-55. It will shift quick, no hesitation. Be sure and fill the connectors with dielectric grease also.
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Stan
Use a cable that is 18 gauge three wire and is shielded and suitable for outdoor use. The cable should have three wires colored red, black and white and has a bare wire wrapped with it and covered with some tin foil and PVC outer cover. Should be available through radio shack or electric wire
distributor. The bare wire is not used so cut it back.
The pot was a 5K ohm, ten turn, 1/2 watt, you can go to 1 watt but it will
just be a little heavier duty. (look at my comments above about a one turn pot - Stan ) You can mount the pot on the dash at a convienient location. It can be in a small project box, in the panel where the OD switch is located, in the message center area, etc. Look on the side if the pot and you will see a diagram and it shows the terminals, 1, 2 and 3. On the pot the two terminals closest together are 1 and 2 with 2 being the terminal closest to the knob end and 3 is the terminal located at the end of the pot and rotated down from the other two.
I used fully insulated connectors, male and female to do the hook up. I pigtailed the pot so if it ever goes out I could change it out easily. I used the following colors: Black to terminal 1, white to terminal 2 and red to terminal 3 on the pot.
I ran the cable up front and cut the connector to the TPS leaving enough
wire so I could re-hook TPS up again if I need to. The connectors have to be
opposite of the type you are using on the cable to reinstall the TPS if
needed.
I connected the black wire to the black wire, the white wire to the orange with dark blue stripe and the red to the violet with white strip.
Most pots are clockwise rotation meaning the more you turn the knob CW, the
higher the voltage. To set the voltage unhook the white wire in the new cable from the orange with dark blue stripe and hook red lead from VOM to the white wire connector and adjust the voltage you want. .7 volts is what I
set mine at.
One thing I want to remind you about, the tranny will not drop into passing
gear (out of overdrive) when you are really getting on it, you will have to
push the button to make it do that if you are in a hurry.
The controller is seeing a voltage that does not vary but the more or less
voltage you crank into the signal line (orange with dark-blue strip) will vary the shift point some what. The more fuel I give my truck the higher MPH it shifts into OD. Just depends how yours is set up. Normally with very light throttle it shifts into OD about 37 to 40 and allot of throttle about 50-55. It will shift quick, no hesitation. Be sure and fill the connectors with dielectric grease also.
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