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Win Tools

3747-123 Dodge/Jeep Valve Spring & Rocker Arm Combo Tool

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0.65 LBS
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  • Similar to Miller 8516 and 8387 Rocker Arm and Valve Spring Tools for 3.7 and 4.7 Dodge and Jeep
  • Similar to the Miller 10102 but can be used small and wider valve springs.
  • Lower cost alternative to Miller Tools 10102.
  • 3747-123 Dodge/Jeep Valve Spring & Rocker Arm Combo Tool


shipping-times.jpgCall for faster shipping options. The Win 3747-123 is a combination 3-in ONE similar to the Miller 10102 that does the job of the 8426, 8387 and 8516A used on 3.7 and 4.7 Dodge/Jeep/Chrysler engines. It's a high quality steel Valve Spring Compressor and a Rocker Arm Tool combination used in place of the Miller 8426, 8387, 8516A and 10102 for Jeep, Dodge, Chrysler 3.7 and 4.7 engines. The original Mopar Miller numbers are 8426, 8387 and 8516. The Win brand is similar but stronger than the originals! The Miller numbers are listed repair manuals. The 3747-123 (like Miller 8426, 8387 and 8516A). 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. There's a partial application below, however this tool works on 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 and 2013. Refer to a service manual for detailed instructions on use.  


  • 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)

Question - Do you have an air hose for compressed air to hold the valve up so it doesn't fall in the cylinder when I remove the keeper and spring?

Answer - Yes. The LIS-19700 Valve Holder is commonly purchased along with the 3747-123. *Note if not removing the keeper, like when you are just putting the rocker arm in, the air valve may not be needed. Always follow repair manual instructions.

Question - What's the difference between the Miller 10102 and the Win 3747-123, they look practically the same?

Answer - The Win 3747-123 is very similar to the Miller 10102, in fact they are the same size and diameter. Use in applications when either the 8426 or the 8387 is called for in the repair manual. The Win Tool is stronger and works just like the Miller 8426 and 8387, at a lower cost. The 3747-123 has more function since it can be used to change broken valve springs or just to install replacement rockers or lifters. That's why most customers choose the Win 3747-123 because it can be used when a 10102, 8426, 8387 or 8516A is needed.

Question - Can I just use a "universal" valve spring compressor to do the same thing?

Answer - No. We have searched with all of our suppliers to find a universal type valve spring compressor and there's not one available that works for 3.7 and 4.7 Mopar engines. The best tool for doing rocker arm replacement, valve spring replacement, cam swaps etc is the Win 3747-123 that can be used when a Miller 8426, 8387 or 8516A is called for in a service manual. The Win 3747-123 offers a much lower cost alternative.

Question - Does this rocker arm remover work on Pentastar 3.6 engines?

Answer - No. There is not one made for the 3.6 Pentastar engine. The design does not allow. Shops typically purchase the Pentastar Combo kit, which includes timing chain holders, phaser locks and a crank holder, to save time from disassembling the front of the engine. See the product by clicking the following Pentastar Combo.

Question - Does the 3747-123 work on Ford 4.6, 5.4 and 6.8 2V engines?

Answer - No. The 303-581 works on the 4.6, 5.4 and 2V SOHC engines. (SOHC means Single Over Head Cam and that there is one cam over each cylinder head)

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28 Reviews

  • 5

    TOOL # 3747-123

    Posted by Bill Richardson on 20th Jun 2022

    Great tool that made changing rocker arms on a Dodge 4.7 engine a piece of cake. So much better than a home made tool. No straining and you can just reach down and take the old rocker out and place the new one back in it position. The tool is strong also. No bending like the cheap imitation versions. Shipping was quick. And they have a ton of specialized tools on their site. Check them out. They are my new to go supplier for specialty tools.

  • 5

    Absolutely Perfect Tool!

    Posted by Armand B on 24th Sep 2019

    Fits absolutely perfect. Makes it easy to get to even the difficult ones. I do not think there is a better spring compressor out there for my little 3.7L Jeep.

  • 4

    Good tool.

    Posted by Harry C on 7th Jul 2019

    Works well on a difficult job. Old guys shouldn't attempt working on a miniaturized jeep with no room for stiff, fat, old hands that bleed just looking at them. This tool was did a great job; was well designed; fit the tight working area on the Jeep. Well worth the money.

  • 5

    Exactly as advertised

    Posted by Nikolas Pyrtcu on 10th Mar 2019

    Work great on the 2005 Dodge Durango

  • 5

    Makes job easier

    Posted by John E. on 20th Feb 2018

    Great tool to have when needed. Wish there were some pictures of how to use tool in packaging. Used internet resources and got job done.

  • 4

    It gets the job done, but it gets in the way

    Posted by Seth S. on 5th Feb 2018

    I bought this tool to replace valve stem seals on a 2004 Jeep Grand Cherokee with a 4.7 HO without pulling the engine or heads. Since it uses a 3/8" drive, I was able to use my extensions to operate it even for the valves in the back. The only down side is that 3747-2 and 3747-3 have to be on the far side, so the get in the way of accessing the spring.

  • 5

    3747-123 Dodge/Jeep Valve Spring & Rocker Arm Combo Tool

    Posted by Vince R. on 25th Jan 2018

    Used the tool on my 2000 Jeep Grand Cherokee. Worked great. I had it from Wise Auto Tools in two days.

  • 5

    very good tool for the job is intended to do.

    Posted by J Georges on 21st Jan 2018

    This tool made my life easier to change all 12 lifters in my 2008 dodge nitro 3.7 lt.

  • 5

    valve seal replacement 2002 jeep 4.7L ho Worked great!

    Posted by Steve C. on 1st Jan 2018

    Tool worked really well in a tight confined space. Was very happy with the design and quality of the tool.

  • 5

    Awesome Product

    Posted by Jason T on 19th Dec 2017

    It made it so much easier to remove the rockers and valve springs on my 2000 model 4.7L V8 jeep. Thanks guys you are a life saver. I am a mechanic by trade here in Australia and this tool is not available at any tool and spare parts place here anywhere. I looked on line for week. Thanks again. From Wise: Thanks Jason!

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