[Fastest H-Town Realtor]

Ahh,the wonders of modifications..Sorry to hear you have probs, but hopefully they are an e-z fix

1-The idea that any manufacturer would leave an appreciatable amount of coveted HP on the table with something as easy as exhaust of intake mods is the folklore of vaporware. The mods listed, less the gears, do little to improve HP. Maybe, maybe you gained 10 hp. The gears simply made up for the tire circumference increase. And, at that, prolly stole the hp you gained in parts. Bigger gears=More HP to drive them. For the missing MPG's, see previous line.

2-Vibration= rims/tires/recip items-Rotate the wheels front to back. Did the vibration change? No? Go to the drive shaft(s). FWIW, did you see the balance on the tires? Does the wheel/tire combo have a ton o'weights on them? These areas are both problematic. An installers idea of "close enough" may not be. And any tire with a truck of balance weights on it needs to be broken down and rotated 180 degrees. Or replaced.

3-Adding those gears plays havok with the trans settings. Yea, the tires to sort of offset that, but,HummersGoneWild correct me if I am off, but the trans also uses a vacuum modulator. The added strain of the tire/gear combo makes the trans think it is doing more work than what it really is. Hence, the itchy trigger finger.

Anytime you have driveability problems, another mod is the last thing you want to do. Fix the current combo-then add more power.

And remember-bigger tires/wheels/gears soak up HP/torque big time. Something has to turn them.