Can I change out my 1978 Corvette differential from a 3.08 to a 2.72 without

[regularguynlr]

any negative side effects? My 78 Vette drives great but when I hit the highway at speeds of 70 MPH + the RPMs reach from 2800 up 3200 which makes me nervous. Especially since it red lines at 5400. I have found I can order an 80/81 model Vette rear end with 2.72 gearing. I am wondering though if that will cause any unwanted effects ie: pinging when climbing hills, or problems with the automatic transmission downshifting.