98 2WD to 4WD Conversion

I'm converting a 98 2WD to 4WD.

Do I need to change the PCM (Powertrain Control Module - The main computer under the cowl accessed from the engine compartment)?

I have the two boxes located in the dash (the GEM and another one).

I also have the short harness that goes to the T-case and a small box that mounts on the frame near the T-case.

Do I need any other electronics to finish the job?

I'm also looking for a stock electronic Command-Trac T-case for a '98 or newer Explorer in good condition.

Thanks,
Jay

 

[Kris Guilbeaux]

you should not have to change the engine computer to do the 4x4 conversion.

 

[Jason_25]

uh, command trac? Isn't that for heeps?