I have a 1992 F150 4x4 302 5 speed. Whenever I am starting off and letting the clutch out it make a nocking sound. It also makes the noise when you let off the gas after going a good speed and it kind of lunges. It is weird noise and I have checked some things but I cant figure out what it is. Thanks for any help.

 

Check the u-joints for play. I had a similiar problem. Ended up dropping my driveshaft. Check all driveline parts for wear and tightness!

 

I changed all my U-joints front shaft and rear. Could it be a motor mount.

 

i changed all my u-joints too before i dropped my driveshaft. The eye on the slip yoke was out-of-round and it snapped! However, I replaced the yoke and thought the problem was solved, but I still kept getting a funny knock. It wasnt until I was plowing one day and started to hear the fan rubbing on the shroud when in reverse. Turns out my motor mounts were completely shot! Replaced them and haven't had any issues since. So yes! It very well could be the motor mounts...Good Luck!

 

that was the problem. Thank you for all of the help. the old ones were shot and now it drives so much better.