GM-GMC: 2004 gmc sierra, lower ball joints, exhaust system components

Question
i have a 2004 GMC sierra 4x4 with a high speed vibration it was in an accident and bent the drive shaft replace and balanced shaft replaced u joint also went ahead an replace front joints truck has 98,000 miles vibration is only their above 75 and most noticeable on accel under coast goes away miked both shafts within 15 thousands and the transfer case has just been replaced any suggestion would help alot as you can tell is driving me crazy thank you

Answer
1 Inspect  Motor Mount  Loose or broken motor mount.  

2 Inspect  Exhaust System  Damaged or restricted exhaust system components.  

3 Inspect  CV Halfshaft  Dry,Worn or damaged cv half-shaft  

4 Inspect  Tie Rod Adjusting Sleeve  Improperly aligned adjusting sleeve or other steering component.  

5 Inspect  Transmission Mount  Loose or broken transmission mount.  

6 Inspect  Tie Rod End  Loose, worn or incorrectly adjusted tie rod end(s).  

7 Inspect  Steering Stabilizer Mount Kit  Loose or broken steering stabilizer bracket  

8 Inspect  Pitman Arm  Worn pitman arm or other front end part(s).  

9 Inspect  Idler Arm  Worn idler arm or other front end part(s).  

10 Inspect  Ball Joint - Lower  Worn or damaged lower ball joints  

11 Inspect  Ball Joint - Upper  Worn or damaged upper ball joints.  

Hope this helps
Bruce