Check the listing for details. Automatic Slack Adjuster, Automatic, 5.5", Meritor Style S23554 R801004. Condition: New. Listed at 75.99 USD. ATTENTION!! If you're not sure about the part number you need To better assist you in finding the correct part please provide 1. YEAR 2. MAKE 3. MODEL 4.Last 8 digits of (VIN) OR (ESN) ENGINE SERIAL NUMBER If you're not sure about the part number you need To better assist you in finding the correct part please provide 1. YEAR2. MAKE3. MODEL4.Last 8 digits of (VIN) OR (ESN) ENGINE SERIAL NUMBERSlack Adjuster, Automatic, 5.5", Meritor Style S23554 R801004 Meritor StyleStroke SensingNon Quick-Connect ClevisCollar Lock Clevis5.5 & 6 ArmsComplete W/ Straight ClevisUnhanded Design, Drilled Worm WheelFactory Lubricated & Sealed, Heavy Duty InternalsNo External Brackets RequiredLong Stroke Compatible, Finest Quality Ductile Nodular IronSpline Length: 10Spline Diameter: 1-1/4"Arm Length: 5-1/2"