We offer extensive professional services for major and minor truck issues. GJ’s Service LLC is a certified NAPA Truck Service Center, so we only offer the best parts and services for your fleet. Our clean, well-equipped shop is located in Lone Rock, WI, and our excellent, well-trained team makes it their priority to get your fleet vehicle back on the road quickly. Below are some of the many repair services that we offer: A/C & Heating Aftermarket Air Filter Replacement Axle Replacement Battery Service Belts & Hoses Brake Systems Clutch Repair Computer Diagnostics DOT Inspections Diesel Service Driveshaft/Axle/Differential Electrical Exhaust System Filter Change Fleet Service Fluid Flush Exchange Heavy Duty Trucks Light Duty Trucks Light Replacement Mobile Repair Mufflers & Exhaust Oil Change Power Steering Preventative Maintenance RVs & Motorhomes Radiator & Engine Cooling Roadside Assistance Scheduled Maintenance Seasonal Maintenance Steering & Suspension Tire Pressure Tire Sales & Service Transmission/Transfer Case Welding