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  • 8516 and 8387 Combo Tool
  • Similar to the Miller 10102 but can be used small and wider valve springs.
  • Interchangeable parts make it work for valve springs or just rocker arms.
  • Like Miller 8426 8387 and 8516A all-in-one.
  • Lower cost alternative to Miller Tools 10102.

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

1.10 LBS
Free Shipping

Product Description


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 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. Free 2-3 days shipping time within USA.

  • 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 - 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.

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Product Reviews

Showing reviews 1-10 of 16 | Next

  1. Excellent Tool 5 Star Review

    Posted by on 5th Aug 2017

    Used it on a 2005 Ram 4.7 4x4 . Tool worked mint. Fast shipping great price thanks!

  2. Awesome tool 5 Star Review

    Posted by on 5th Jul 2017

    Good value for the money. Worked awesome on my 03 ram 1500 with the 4.7.

  3. The tool work amazing just like you think it should 5 Star Review

    Posted by on 23rd Jun 2017

    2003 Dodge Durango with 3.7 V6

  4. The Safest Tool For The Task 4 Star Review

    Posted by on 21st Jun 2017

    We used it on a 2002 Ram. Getting to the rear-most cam followers was difficult because of the brake booster & other components in the way, but this tool made the job easier and safer to perform the task. Any professional mechanic should have this perfect tool in his toolbox, truly.

  5. Good Time Saver 5 Star Review

    Posted by on 9th Jun 2017

    Used it to change lifters in a 4.7L Dodge engine and it made the job easy; it was harder to get the valve covers off and on.

  6. Perfect Tool 5 Star Review

    Posted by on 31st May 2017

    Thanks. The tool works just like it should, perfect fit and very easy to use.

  7. Worth the money 4 Star Review

    Posted by on 10th Apr 2017

    Bought for a 4.7L saved time and hassle of removing can shafts would highly recommend.

  8. Really Works Well 5 Star Review

    Posted by on 7th Mar 2017

    I used this on a 2003 jeep Liberty 3.7 L V-6 and it worked flawlessly. I replaced the lifters- it would have been a real bear to do without this tool. Two thumbs up!

  9. Good tool to make the job easier. 5 Star Review

    Posted by on 2nd Mar 2017

    Did a great job.

  10. Gets the job dine for half the price! 5 Star Review

    Posted by on 6th Feb 2017

    I have a 2002 Dodge Ram 1500 Quad Cab SLT 4.7L engine. I was able to compress both the hydraulic lifter and valve spring with this combination tool with the head still on the engine in the engine bay. Replaced the valve and lifter with relative ease. I highly recommend as the function/quality of the tool is well worth the price.

Showing reviews 1-10 of 16 | Next

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