T case swap issues.FF'n engineers

[bison]

I am in the process of swapping T cases on my 95 with auto tranny, the donor is a 95 st tranny.
T cases are identical,241,same gear ratio.
Upon bolting the the donor case in, and when trying to plug the shift indicator plugin in ,it would'nt fit. happens to be a 2 pin sensor, the original is 3 pin, but the shank below the tread happens to be a 1/2" longer than the 2 pin sensor.This wont fit the donor as it will bottom out before i can engage the tread:mad2::mad2::mad2:Could'nt these stupid engineers keep these things the same lenght?:rolleyes5:
Is there a way to make this 2 pin sensor work.
wich of the 3 wires do what? could i combine 2?
Will the speedo sensor be diff as well? i did'nt look yet.

Please dont tell me i have to rip the case out again and rebuild the original

 

[THEFERMANATOR]

On the 3 pin auto one, the center pin is grounds the ECM circuit to tell it when you are in low range so it can calculate the gear ratios. A standard tranny model doesn't need that portion since it doesn't check gear ratios through the ECM. As for the lengths, I don't know what to tell yeah. I thought all of the GM 241 cases were the same.

 

[bison]

On the 3 pin auto one, the center pin is grounds the ECM circuit to tell it when you are in low range so it can calculate the gear ratios. A standard tranny model doesn't need that portion since it doesn't check gear ratios through the ECM. As for the lengths, I don't know what to tell yeah. I thought all of the GM 241 cases were the same.

So if i ground the middle wire to the tranny,would that take care of the situation?

 

[NVW]

So if i ground the middle wire to the tranny,would that take care of the situation?

It's just a guess but I think that would tell the PCM it's always in low range

Leo

 

[bison]

It's just a guess but I think that would tell the PCM it's always in low range

Leo

You are right,the the switch is normally open and ground is established to the body when the switch closes in both 4x4 high and low.

So,what if i use the 2 pin switch to activate the fr axle acuator, and use a relay wired in the the actuator power supply side to get ground to the ECM on the middle wire.
would that work?

I just tought about it,the donor truck has 4.10 gearing,the recieving truck(i dont know the ratio),but it aint 4.10. Will that throw a monkywrench in the how fast we go gauge.?

 

[THEFERMANATOR]

The middle wire has to be grounded any time it is in low range. When you ground that wire the PCM re-calculates for the 2.72:1 gear reduction so that it knows what the gear ratios are.

 

[NVW]

The middle wire has to be grounded any time it is in low range. When you ground that wire the PCM re-calculates for the 2.72:1 gear reduction so that it knows what the gear ratios are.

With this info is seems to me you could either run the ground through a toggle switch and manually ground it while in low range or mount some type of momentary switch that made contact with the linkage when in low range.

Leo