Here is the video of the knocking noise from my 2025 Suburban 5.3 V8 L84

[George Yorkshire]

2025 Suburban 5.3 V8 vehicle

 

Notice how the sound is a rhythmic, metallic knock that seems to originate from the driver-side bank. It is most prominent when the vehicle is in Gear (Drive or Reverse) with the brake applied, especially after the engine is fully warmed up from a long shift. One tech says 'Lifter', another says 'Bottom End', and another says 'Torque Converter'. I would appreciate it if you could listen and let me know if this sounds like the typical L84 lifter failure or something else. 

 

 

 

Edited February 5 by George Yorkshire

[Snow White]

a 5.3 with a rod or main spun?  that's kinda rare compared to the 6.2 but thats not good.  send in a oil sample.