noise diagnosis

Orig owner, 2008, 4cyl, 2wd, stad cab, 5-speed, 220k miles, orig clutch. meticulous fluid and general maintenance, never off-road.

Noise only is noticed under one scenario, otherwise truck seems just fine. Seems to be very slowly getting worse over the last 10k miles.

On the interstate, 5th gear above 60mph cruising and shifting just fine. Clutch truck out of gear and into nuetral, take foot off clutch. Coast for a few seconds, depress clutch, it shifts smoothly back into 5th but at some point while engaging the clutch or just soon after, a good 'thunk' from the engine/trans/driveline somewhere. then back to normal shifting and driving.

Recent related work; engine mounts and trans mount were original and needed replaced anyway. I did that 3 weeks ago and did not change noise at all. Maybe 2 years ago I did the rear u-joint only.

Plan to crawl under tonight and wiggle front u-joint.

Any immediate thoughts or ideas?

THanks folks.

Dave, Green Bay, WI.

 

U-joint was my first thought as I was reading your description of what's happening.