1999 k2500 suburban 7.4 vortec 4l80
When under load deceleration down steeper grades I am getting a grinding sound from the bell housing. It sounds like metal on metal brakes. The sound is tied to engine rpm. The sound stops as soon as I tap the throttle. The only time I have had it happen is longer downhill steeper grades 6% or higher when pulling a trailer with fairly heavy loads. Any ideas as to cause would be appreciated.
When under load deceleration down steeper grades I am getting a grinding sound from the bell housing. It sounds like metal on metal brakes. The sound is tied to engine rpm. The sound stops as soon as I tap the throttle. The only time I have had it happen is longer downhill steeper grades 6% or higher when pulling a trailer with fairly heavy loads. Any ideas as to cause would be appreciated.