2000 4.8 4x4
 

Transmission not pulling and rattling. I can turn key off and start it back up then it will pull forabout 100ft then stop again. It has 140k on it but haven't had any trouble yet. Any suggestions would be appreciated. Ihave donelots of mech work on old chevys and now Harleys. Just don't Know about all the new stuff. Thanks.