# Noise when manual hubs are locked and in 2wd

**URL:** <https://community.cartalk.com/t/noise-when-manual-hubs-are-locked-and-in-2wd/49366>\
**Category:** Maintenance/Repairs\
**Created:** [May 25, 2010, 4:34pm UTC](https://community.cartalk.com/t/noise-when-manual-hubs-are-locked-and-in-2wd/49366 "2010-05-25T16:34:07Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ac\_mckracken](https://avatars.discourse-cdn.com/v4/letter/a/ed655f/32.png) [@ac\_mckracken](https://community.cartalk.com/u/ac_mckracken)\
**Post date:** [May 25, 2010, 4:34pm UTC](https://community.cartalk.com/t/noise-when-manual-hubs-are-locked-and-in-2wd/49366/1 "2010-05-25T16:34:07Z")

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I have an Umm Alter 4wd truck with manual locking front hubs. I use the 4wd routinely, and so have often left the hubs locked while driving in 2wd. Recently, when doing this there is a loud popping or banging sound coming from somewhere around the right front wheel or front differential. If I unlock the hubs in 2wd, this does not happen, and if I am in 4wd, it does not happen, only with the hubs locked in 2wd. I do not know much about differentials (I dont even know what style the Umm Alter has) but was wondering if anyone had any ideas. Or could it be the u-joints? (no cv joints on front wheels)? Thanks.