Valve Spring & Rocker Arm Tool Combination 3-in ONE Similar to The Miller 10102 It's a specialty tool used to compress the valve springs and access the keeper which is needed when changing the valve springs. Also can be switched over to the Rocker Arm Tool when you don't need to access the keeper. Use of this tool is safely done without damage to the camshaft or camshaft lobes. Used to allow removal of the camshaft, rocker arms and hydraulic lash adjusters in 4.7 Liter Engines.The valve spring tool allows access at the valve keeper so a magnet can be used to remove it. Fitment: For 1999~2013 Jeep, Dodge, Chrysler 3.7 and 4.7 engines Application Chart: 2006 (DR, HB, KJ, ND, WK, XK) - Systems (9 - Engine, 3.7L, 9 - Engine, 4.7L) 2007 (DR, HB, HG, KA, KJ, ND, WK, XK) - Systems (9 - Engine, 3.7L, 9 - Engine, 4.7L) 2008 (DR, HB, HG, KA, KK, ND, WK, XK) - Systems (9 - Engine, 3.7L, 9 - Engine, 4.7L) 2009 (DS, HB, HG, KA, KK, ND, WK, XK) - Systems (9 - Engine, 3.7L, 9 - Engine, 4.7L) 2010 (DS, KA, KK, ND, WK, XK) - Systems (9 - Engine, 3.7L, 9 - Engine, 4.7L) 2011 (DS, KA, KK, ND) - Systems (9 - Engine, 3.7L, 9 - Engine, 4.7L) 2012 (DS, KK) - Systems (9 - Engine, 3.7L, 9 - Engine, 4.7L) 2013 (DS) - Systems (9 - Engine, 4.7L) 【FITMENT】: The Valve Spring Compressor and a Rocker Arm Tool fit for 1999~2013 Jeep, Dodge, Chrysler 3.7 and 4.7 engines. Alternative to Mopar Miller 10102-8426, 8387 and 8516A. 【FUNCTION】: This special rocker arm remover used to allow removal of the camshaft, rocker arms and hydraulic lash adjusters in 3.7 and 4.7 Liter Engines. Also can be used to change broken valve springs or just to install replacement rockers or lifters. 【ADVANTAGE】: A specialty and must have tool, which to remove and install rocker arms safely without damage to the camshaft or camshaft lobes. The valve spring tool allows access at the valve keeper so a magnet can be used to remove it. 【MATERIOR】: The valve spring tool constructed from superior heat-treatedsteel and proprietary hardened for maximum durability and excellent solid, no deformation. Black oxide finish to resist rust and corrosion for maximum strength and longevity. 【SUPPORT】: Our focus on products and customer services is 2nd to none. We provide friendly 1 years’ warranty support, easy-to-reach Customer Service and 100% satisfaction guarantee to make sure your investment!