16' Escalade - Loud rattling noise from front end while engine Lugging

[Tony]

Anyone ever get a loud rattling noise when the car is lugging? Sounds as if it's coming from the transmission or possibly from the front end,, its a fairly loud chattering noise,, It definitely is not normal, I was just wondering what I was in for, before I take it to Cadillac?

 

[shewstring]

Tony, you are sure it is not pinging? I assume it does it if you prem or reg in the tank? Did it just start doing that or has it always? How many miles on it?

 

[Tony]

It is brand new,, only 400 miles on it.. I don't believe it's pinging because the engine was not under any load when it was doing it,, plus so far I have only filled it with 93 octane from top tier gas stations..I am afraid that I might have a bad motor mount,,