The truck hit the ramp at with its 800 horsepower NASCAR Camping World Truck Series engine. He won the 2010 Pro 4x4 championship. In 2011, Greaves set the record for the fastest ever Pro 4 lap at Crandon. He overpowered Rick Huseman's 1:18.983 lap to establish a new record of 1:19.482 at the June Brush Run weekend. Greaves battled Ricky Johnson for the TORC championship all season. The duo battled for the lead in the opening laps for the final race at Texas. Greaves' truck broke in the final laps of the race and Johnson won the race along with the championship. Greaves beat Rob MacCachren for the 2013 TORC championship by 20 points. One of Greaves highlights in the season was battling his son C. J.'s Pro 2 for the 2013 AMSOIL Cup. After the Pro 4 trucks started behind the Pro 2 field, Greaves passed all of the Pro 2 trucks except his son's. The two battled against each other for the final four laps. They pulled side by side coming out of the final corner and jumped across the line in a photo finish won by C.J.  Greaves has more than 53 victories, which was the most in CORR's history. Greaves' son C. J. Greaves began racing in buggies as a teenager and rapidly rose up the ranks to Pro 2 by 2012.