Not all Marks has Trac Loc. You have to check the sticker on the driver side door jam. There you will find the letters "AX". Under the AX is the axle ratio code. Compare it to the following:
8...2.73:1 Conventional or open differential
Y...3.08:1 Conventional <--- MINE JLM
I know that lis tis good for 94-97. It should be good for 98???
The TA applied rear independent braking to the slipping wheel. Two pins from the ABS wiring harness are for the traction control. Pin 25 turns the TA on/off and Pin 44 controls the TA indicator light. Battery voltage is applied to PIN 25 and the TA is activated. Flip a switch and the TA function is turned off. You can make the TA toggle switch and light.