Going uphill in a 2007 Chevy Tahoe Question?

CZR

New member
Ok I just bought a 2007 Chevy Tahoe and I drove it this weekend to Baja Mexicali Mex. Ok going there I take the 8 east and there is alot of up hill driving now my question is when I go up hill is there some kind of over drive button I need to push or does the gear change automatic? The reason I am asking is because I have a 1997 Toyota 4-Runner and when I go up hill I push the over drive button but I don't see one here in my 2007 Chevy Tahoe.
 
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