I have a lot of drivetrain vibration and would like to try a new driveshaft as a first step to solve it(I hope it's not the TC I installed)Which is better aluminum or chromemoly? where's the cheapest place to get either?

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89 FORMULA 350,WS6 SUSPENSION,FRESH 355 MOTOR,TCI 12" STREETFIGHTER,TRANSGO SHIFT KIT,3.70 GEARS,SLP REAR CONTROL ARMS/PANHARD,HOTCHKIS STB,FORMULA GP'S,FLOWMASTER EXHAUAST,58 MM BBK,MINIRAM INTAKE,ALL FREE MODS(HEADERS WAITING IN GARAGE)SLP 3/4",NO CATS,

 

aluminum, not sure about the chromemoly. i believe the factory drive shaft is plain old carbon steel.

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1st & 3rd