Install Time: 4-6 hours Average estimated install time peformed by a professional shop or mechanic. Tires: 31x10.50 R15 Recommended tire size for use with this kit. Please see Instructions for complete notes on this tire size recommendation. 2.5IN JEEP SUSPENSION LIFT KIT for 1976-1983 4WD Jeep CJ5, 1976-1986 4WD Jeep CJ7 & 1981-1985 4WD Jeep CJ8 Scrambler