I have A left Front Tier ON My GMC yukon that make a Pumping Sound pom pom pom When i reach 50m I have done alinment, weel balance greese still doing that pumping sound hlllllllllllllllllp???
How about a big lump on the tire?
You have irregular wear on the tire and that’s what is making the noise. The alignment caused the irregular wear - and you fixed that - but to get rid of the noise, you either have to be patient to allow the tire to develop a new wear pattern, or replace the tire.