Track Arm/Steering Wheel??

Bwano, so i replaced my track arm on my truck yesterday and all went good. So i go to leave from the shop and my truck seems to drive a little better but my Steering wheel is now turned to the left and not centered. The truck centers itself with the steering wheel turned to the left(and i dont have to hold it left, thats where it drives striaght so to say. Just trying to figure out y a new track arm would make my steering wheel move to the left as it goes straught down the road. my dad said pop the wheel off and move turn it a knotch but dont understand y it would move my wheel. Feedback would b great because i cant figure this one out. Maybb because i changed all the steering stuff i should get it aligned again.  Thanx again Gents.  
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99 Dodge 2500 24V, dual blade electric Flex-A-Lite fan, AEM Brute Force air intake, Banks Power Elbow/ 4" exhaust back to 6" Black SilverLine stack, Dunlop Firce Additude 305/70/16 tires.

If the old track bar held the axle out of center and you had an alignment job done, then put a new track bar on that moved the axle over, it will change the linkages and cause the wheel to turn  
Logan
1995 12 valve Cummins 6.0L, 5 speed, 4x4, 600hp Valair Clutch. Air Dog 150, no fuel plate, benched pump, SDX 5x.014 injectors, Hamilton 181/210 cam and HD pushrods, Stage 2 Port job, 5 angle valve job, 60lb valve springs, ARP studs, O-ringed head, .020" head gasket, coated pistons, balanced bottom end, Fluidampr, PDI exhaust manifold, homemade intake manifold, 63/68/0.80 over 80/92/1.32 compound turbos.

yeah thanks. just have to get it aligned again. the new bar was way bigger and way tighter, realy akes a difference  
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99 Dodge 2500 24V, dual blade electric Flex-A-Lite fan, AEM Brute Force air intake, Banks Power Elbow/ 4" exhaust back to 6" Black SilverLine stack, Dunlop Firce Additude 305/70/16 tires.