When you are searching for your GT open the door (assuming the gears havent been changed) and look at the sticker. On the right side will be an axle code "AX" under it is the code. M= 273 limited slip, Z=3.08 limited, R=345 limited, E= 327 limited, W=373 limited, K= 355 limited. You will only find M, or Z maybe an E. Happy Hunting. John BTW most 5 speeds have been changed to 373 already. Thats usually the first mod done
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89 Notch: 10 pt. cage, d&d rear coil overs, moser 33 plines and spool, gutted 
91 Hatch: cobra int. fms. c-springs, novi-1000 w/f-150 crank pulley (9lbs.) 
06 F-350 6.0 crew cab lariat srw 4x4: turbo back exhaust, sct xcal. 
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