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This is the second truck i have done shackles in the back and get a horrible creaking noise when taking off, going over bumps and backing up.. anybody else ever had this issue??? please help..

06 silverado single cab
 

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Creaking in the shackle or in the drive shaft. Creaking in the shackles is probably over tightening the bolts, loosen em up a bit and throw some lube on the bushings. If its in your drive shaft then your pinion angle might be out of alignment.
 

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Most likely the shackle bolts are too tight if you noticed it right after you put them in.
 

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I bought some djm shackles and they squeaked like crazy. if they are djm, you can't tighten them like the stock ones. The guy at djm said 35 pounds for the spring to hanger bolt. The hanger to frame bolt can be at factory spec. You also have to make sure you grease them well.
 
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