I bought this truck about 3 months ago. 2 months ago, I started to notice a weird, minor vibration coming from the bottom of the truck upon acceleration, notably in 3rd gear between about 30-40mph.
Since about a month ago, I have noticed a faint squeaking noise upon moderate acceleration. This noise would disappear upon coasting or light acceleration, but would get much worse during hard acceleration. As of yesterday, I now have a very, very noticeable "clunk" when upshifting, most noticeable during the 1st-2nd, and the 2nd-3rd.
The truck is a 2002, V6, manual transmission 4x4.
So, my first thought was that a u-joint was failing.
I look under the truck, and, oh joy, I have 4 u-joints in the rear-driveshaft alone! Yay!
So, I dropped the drive-shaft (don't worry, I marked it all out) and proceeded to test the u-joints. ALL u-joints pivot perfectly and without any resistance or noise. The carrier bearing is very, very slightly out-of-round when turning, but has no slop whatsoever. The u-joints also have no slop of any kind.
I really don't feel like taking every u-joint apart if I don't have to, as all I have is a trusty 3/4" socket and a hammer to do it with.
I'm also quite broke right now, and can not afford to just bite the bullet and replace every single one. I want to find the culprit.
I don't believe it is a front u-joint, as the squeaking and clunking noises seem to be emanating from slightly behind and to the right of the driver position inside of the truck.
So, once again, any feedback would be great!