clunking? need some ideas?? don't let me down!!!

[gmc004x4]

i get a clunk clunk at start up. it sounds like the exhaust hitting under my feet. i checked to see if that was it, but it did not even move. i checked the torsion bar and it did not move. it only does it on start up. the engine runs just fine. i can not hear or feel anything when driving at any speed. this is odd to me because it just started today. i was thinking maybe a bad engine mount. i have no idea at this point.

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[bandidolenny]

Sounds like motor mounts (a real fun job) and don't forget about the tranny mount.

[terry s]

By start up do you mean when you start the engine or start to go when stopped?

[gmc004x4]

if i am sitting still and i start up my truck i will hear a clunk clunk. every now and then i think i hear it while i am driving