01Chevy tahoe Transmission wont shift without reving RPMs between 2&3rd gears

What is your question?

When I take off my 2001 Chevy Tahoe 5.3l 4x4 it shifts fine until I get to the 35-50 mph range like 2nd & 3rd gears the RPMs Rev pretty high I have to let off the gas and get back on it for it to shift. Seems to struggle to hold high speeds as well.doesnt leak Has 140,000 miles

How long has your 2001 Chevrolet Tahoe had this problem?

Just bought it so like 4 days