i am 54 years old and been farming for 12 years. i run 5 ford tractors. 1x ford 6640 4wd. 1x ford 6640 2wd. 2x ford 4630 and 1 ford 6610. these tractor are an old lot but very reliable. there only problem i have encountred is on the 6640 2wd front axle which i ended changing to carry 14.9.24tyr...