Starting about a month and a half ago,whenever I start to approach 40mph and up my pickup begins to vibrate. Nothing terrible until I hit about 70mph, when it really begins to shake. Its not the tires; discount gave me four brand spanking new tires today, and the problem still exists. I am running 3.90 gears, and I read the driveshaft thread, but I don't think it has anything to do with the driveshaft. Does anyone have any suggestions or ideas?

thanks guys!

 

drive shaft

 

Did you lower?

 

Driveshaft

 

take your driveshaft to a shop and have it balanced I bet that wull fix it

 

No, my pickup hasn't been lowered.

As for the driveshaft, why do y'all say its that....? I mean, lots of people get their gear ratio changed; this is the first time I've heard of that?

 

you could have dinged the shaft with an object from the road or hit it aganst somthing. If there was a factory weight you could have thrown it off. I would first visually inspect it to look for dents of dings or spots where a weight used to be. While I was doing this I would swap u-joints too

 

I take it I wasnt the only person inebriated...

but thanks y'all!

 

Trying to work and type is a challenge sometimes