Name that sound

[kofifi]

Not sure if I'm posting in right section.
Long post but here goes. My wife got a flat yesterday on her Tahoe on way home. Instead if her stopping she drive to end of block on rim. I got road side assistance to change tire to spare. Later on that day we went riding around and I put truck in auto and it made a loud thumping and knocking sound when I applied gas. It felt like somehow the brake was engaging itself. Can anyone give me a point to start or reference spot. Could it be due to having a 17 inch spare on my vehicle and all others are the factory 20's??

 

[kofifi]

By the way it only makes the loud clunking/thumping when auto 4hi or 4lo is engaged. In 2 wheel drive it does not make a single sound and drives perfectly.

 

[Passin Thru]

Just guessing but could be different overall height between the tires

 

[kofifi]

i get my tires in tuesday. i guess i need to wait before i go to shop incase it is the difference in tire heights.