rattling noise

[AshenShugar00]

Ok u know the new tranny I put in (ax-15) k works good. Any way when im in 3rd and 4th gear at low rpms it rattles untill the rpms go up....i dont know what is rattling and it only rattles when i try accelerating but eventually it dies off...any ideas? (its not the kind of rattling like a tool was left on the crossmember either)heh ichecked

[Dukes69]

If you hold it at the same RPM, does it make the same noise? If so, have some one hold the RPM there and get under the Jeep and see if you can locate the rattle. Or does it only do it when it is in gear?

[AshenShugar00]

Oh, it only does it when in gear...not while in neutral..