Weird sound in 1st gear

[Glennb]

This happens only sometimes when the engine and tranny are warmed up. In first gear right after I let out the clutch i get a weird inconsistent rumbling vibrating sound coming from the front if the tranny (I think). The sound suppresses as I shift into higher gears but I can still hear it faintly.

Does anybody know what this is?

[getslideways]

clutch chatter maybe?

[Wagonholic]

clutch/flywheel chatter, is it a stock or lwfw?

could also be mounts

but these trannys are very noisy. mine was rebuilt less than 30k ago and it likes to make whining noises. lol.