when looking at specs i found that the front track width is different between the coupe and sedan,

what makes them different?

a-arms? wheel bearing, knucles?

when swapping parts this could make a differance, if anyone knows please let share

i've swapped subframes between coupes and sedans with no problem so i'm guessing its withing the suspension components, maybe thats why my car pulls to one side on the track, could one side be shorter than the other? even after countless alignments 1.2" per side is significant

Front track (coupe) 57.1 in (1,450 mm)
Front track (sedan) 58.6 in (1,490 mm)

 

I'd like to know where you're getting those coupe track widths measurements from. I'm seeing 58.7" Front and 58.1" Rear for both. (From autos.yahoo.com)

 

The front and rear suspension components are the same for both. However, you need to make sure you run the same model components on both sides, like FE5/FE5 and not FE3/FE5.

 

wikipedia

 

I found your problem.

All Cobalts have the same track width, according to GM. (Go to the "Dimensions" tab)

http://www.chevrolet.com/cobalt/coupe/features-specs/
http://www.chevrolet.com/cobalt/sedan/features-specs/