so hi to all
first off i bought a 1999 suburban with 193,000

when you hit the breaks grinding so new pads turned roters all new breaks in back
still grinding
when driving some bumps make it grind
auto 4x4 no differnt
in 4lo 4hi grinds 100% of time
but the 4x4 works well
brought it to rapid oil change had them change the front diff fluid the trans fluid and rear
he said all was good (levels and fulid was norm)
brought it to a chev delaer and they said they had it on a hoist the grinding they belive its coming from the t-case

$1500 JUST FOR THE T CASE or they might be able to fix it on a hourly charge??
so if it is the t-case why when the breaks or bumps even when netural

i hope some one can help