hi.. yes a shake at 110 mph.

i have a 2008 1500 5.3, it has cam, converter, headers, lowered 3/5, dod delete, custom tune, and a lot of other stuff. i recently put 3.90 gears in it and the back lash is perfect and they have the perfect pattern when checked. before the gears i would take it up to 125mph with no problem now with the gears it viberates/shakes at 110mph really badly. has any one had this problem????????

need help

 

Ima guess ur in a ext cab or 4-door?

 

The gear swap increased your driveshaft speed. Basically, the vibration is your driveshaft's way of telling you that it's very unhappy, and about to eject itself. If that happens, expect a lot of damage.

At a minimum, have the shaft balanced. If the budget allows, consider converting to a 2 piece shaft.

 

speaking from experience. slow down or lose the driveshaft. potential destruction vs stopping at 98 mph. you're call. just consider the vibration a warning of carnage to come.

 

Personal experience of mine....tossing a drive shaft @100+ is the most scary event of my life! Thought for sure it was going to come through the floor.

 

He nailed it. What gears were you running prior?

 

Get it balanced. I have all mine balanced. Cheap insurance. Factory balancing sucks.

 

my truck does the exact same you need to get a built drive shaft and have it balanced watch my video link on my signature of my truck breaking the drive shaft and that was when the truck was stock.

 

Get a custom built shaft! Mine came out twice(factory shafts). First at 100 ish, second at 85ish. Got a new 3.5" steel one piece and upgraded the yolks as well the 1330's. No problems now at any speeds. Btw, each time cost me $15-1800 in parts/labor to fix.

 

Roger is on time with his response.. I would also not be doing 125mph blast on the reg unless you have decent rated tires.