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Ships within 48 hours · Estimated delivery Jul 16 - Jul 21
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Description
Synergy 8516-02-400 Add-A-Leaf PackImprove the ride quality on your 2003 2013 Dodge Ram 2500 3500 4WD with the Synergy 5612 02 400 Add A Leaf Pack from GAP. The Synergy add a leaf pack is a 5 leaf design that replaces the factory overload spring for improved ride quality both on and off road. It eliminates the harsh spring rate ramp up caused by overload engagement and results in a more predictable comfy ride and better traction for your vehicle. Features: High Quality 9 16" E Coated U
Improve the ride quality on your 2003-2013 Dodge Ram 2500/3500 4WD with the Synergy 5612-02-400 Add-A-Leaf Pack from GAP. The Synergy add-a-leaf pack is a 5-leaf design that replaces the factory overload spring for improved ride quality both on and off-road. It eliminates the harsh spring rate ramp-up caused by overload engagement and results in a more predictable comfy ride and better traction for your vehicle.
Kit Includes:
(2) 8516 Add-a-leaf packs (Single or Dual center pin depending on part number)
(2 or 4) 1/2-20 UNF x 6.0" long replacement center pins
(4) 9/16-18 UNF x 4.0" or 3.50" x 10-11" long HD E-coated U-bolts (Size varies depending on part number)
(8) 9/16-18 UNF GR8 tall nuts
(8) 9/16" ASTM F436 hard washer extra thick
Features:
- High-Quality 9/16" E-Coated U-Bolts
- F436 Extra Thick Hard Washers And GR8 Tall Nuts Included
- Bolt-On Installation Using Basic Hand Tools
Kit Includes:
(2) 8516 Add-a-leaf packs (Single or Dual center pin depending on part number)
(2 or 4) 1/2-20 UNF x 6.0" long replacement center pins
(4) 9/16-18 UNF x 4.0" or 3.50" x 10-11" long HD E-coated U-bolts (Size varies depending on part number)
(8) 9/16-18 UNF GR8 tall nuts
(8) 9/16" ASTM F436 hard washer extra thick
Note: 2013 Dodge Ram 3500's were a split year for production. If your truck has radius arms use 2014+ Dodge Ram parts.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 21 reviews
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Product Reviews
★★★★★ 5
Great product!
Color: Black
Use this under my hard hat to keep from sliding everywhere. I have bought several over the years and this have been my favorite so far. Will definitely buy again.
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Reviewed in the United States on May 13, 2026
★★★★★ 4
Good but if the elastic band were wider it would be great
Color: Black
This is a great under helmet or perspiration barrier for the face during heavy spinning workouts. Sadly to avoid an indentation to your forehead, you must wear it inside out because the sewing band is narrow and tight.
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Reviewed in the United States on March 3, 2026
★★★★★ 5
"Head" of the house gift...
Color: Black
Great fabric, nice fit..
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Reviewed in the United States on May 23, 2026
★★★★★ 1
Too damn small
Color: Black
Way too small for an adult. It doesn't even fit my 11 year old. Unfortunately I didn't open it immediately or I would have returned it. Now I'm stuck with something nobody in my house can use.
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Reviewed in the United States on April 16, 2026
★★★★★ 3
One size definitely doesn’t fit. Otherwise Ok.
Color: Black
OSFM - one size fits most. It should be OSFS - one size fits small/some. Measured my head size and according to their chart I’m l/XL. This cap is tight fitting and gives you a headache after an hour. Otherwise it’s fine. Keeps your head cool, is absorbent and works well under a helmet.
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Reviewed in the United States on November 21, 2025
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