does anyone know what could be causing a vibration in 2nd gear at about 20 mph..
It only seems to be vibrating in 2nd at around that speed.

the truck is a 2004 lowered front and 2"in the back, but i dont think this has anything to do with it, because i noticed it afterwards.

thanks for the help

 

Mine also vibrated after I droped the rear 2"s. Mine truck is an 03 so I removed the stock shims and all is well now!!

 

well, i was thinking that it might be the drop but if this was the case why wouldnt it vibrate in all the gears?

 

guys I also have a vibration around 20-25 mile per hour. My truck is an 04 Screw 2WD, raised 2.5 in the front, 2 inches in the back. I was wondering if the change in driveline angle may be the culprit. Do I need to have shims installed? I have the two piece driveshaft and 3.73 rear end with LS. I started to notice this after the lift was installed, it has been hard to isolate and its smooth as glass at highway speeds.

 

Superscrewd,

Would you mind emailing me at freddytran@yahoo.com? I have a question as to what the Ford rear blocks look like. I am planning to buy some off another member but want to make sure I get the right ones. I want to send you a pic of the blocks he is offering. Thanx.