2002 Chevy Corvette warning light for abs and traction

light for abs and traction control went on after i spun the wheels on a wet pavement at a light. i thought the warning lights was just a computer glich because the car seemed to act normally, until again on a wet day giving the car a little bit of gas going up a hill i did a 180 luckily no other cars near me. brought the car to my chevy dealer the told me that the systems are connected and had to be replaced at a cost of nearly $5000. would like to know if this cost seems reasonible. would there any recall on this repair? is this unusual for 37000 miles? thank you john2