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Description
Synergy 4170-12 Heavy-Duty Ball Joint Set (Knurled)Replace the ball joints in your vehicle with the Synergy 4170 12 Heavy Duty Ball Joint Kit from GAP. These ball joints use a metal on metal bearing design, unlike the factory (plastic nylon bearing design), to improve durability and performance. A must for vehicles with lifts and larger tires that see off road use. Get rid of that steering wander and play caused by loose or worn out ball joints. While Jeep may have updated the JL JLU and JT steering
Replace the ball joints in your vehicle with the Synergy 4170-12 Heavy Duty Ball Joint Kit from GAP. These ball joints use a metal on metal bearing design, unlike the factory (plastic nylon bearing design), to improve durability and performance. A must for vehicles with lifts and larger tires that see off road use. Get rid of that steering wander and play caused by loose or worn out ball joints. While Jeep may have updated the JL / JLU and JT steering knuckle to use a dual load bearing upper and lower ball joint, they still kept the problematic nylon inner liner which is prone to premature wear. The Heavy Duty Ball Joints feature the latest design used in other ball joint applications with our proven design that are sure to stand the test of time.
Features:
- Fully Greaseable Metal On Metal Design For Prolonged Life
- Compatible With All Aftermarket Axle Shafts (Including RCV's) With No Modifications Needed
- Ball Joint Housing Is Manufactured From 1045 High Carbon Alloy Steel For A Strong, Smooth, Bearing Surface
- Ball Joint Dust Boots Are Made From An Industrial Grade, Wear/Tear Resistant Black Nitro-Butyl Rubber (NBR)
- Ball Joint Stud Is Manufactured From Induction Heat Treated 4140 Chromoly Steel For Maximum Strength & Reliability
- Ball Joint Bearing Race Is Manufactured From Sintered Graphite & Oil Impregnated Bronze For A Strong, Smooth, Bearing Surface
- Ball Joint Bearing Surface Area Is Considerably Larger Than Stock Due To Elimination Of The Inner Nylon Liner For A Longer Lasting Joint
- 12 Month Unlimited-Warranty
4170-12 Heavy-Duty Ball Joint Set Includes:
(2) Upper Ball Joint(2) Lower Ball Joint
Notes:
Metal on metal ball joints require a small break-in period of typically 100-500 miles to fully "seat" the bearing surfaces. During this time the steering may feel "sticky" or slow to "return to center". Once broken in, the steering will be smooth and tight.Knurled ball joints are required when replacing ball joints that have enlarged the axle end forging bores
It is up to the installer to verify the proper ball joint style is being used.
Part Number 4170-12 Includes (2) 4170-04
Synergy High Performance Grease (4119) recommended.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
4.5 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
Great tart candy for dry mouth!
Flavor Name: Tart Cherry, Size: 3.85 Ounce (Pack of 1)
These are delicious tart cherry candies that help combat dry mouth. They are sugar free and individually wrapped so it’s easy to carry a few around in your pocket or purse.
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Reviewed in the United States on December 14, 2025
★★★★★ 5
These work well
Flavor Name: Tart Cherry, Size: 3.85 Ounce (Pack of 1)
These are a nice alternative to lemon drops. They are a little sour/tart but that’s the point. They taste just like a regular hard piece of candy, without the sugar. They do help my dry mouth and I will purchase them again!
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Reviewed in the United States on November 26, 2025
★★★★★ 4
Flavor is pretty good, but could be better
Flavor Name: Tart Cherry, Size: 3.85 Ounce (Pack of 1)
In trying to find a keto candy WITHOUT maltitol, this one is a pretty good one. It’s a great blend of tart and sweet, but I just wish the cherry flavor was more concentrated. The flavor is good- just a little dull. I’ll still rebuy them because they help satisfy my cravings, keep me keto, and don’t give me any stomach issues.
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Reviewed in the United States on October 12, 2023
★★★★★ 3
Horrible taste.
Flavor Name: Tart Cherry, Size: 3.85 Ounce (Pack of 1)
Medicinal taste.
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Reviewed in the United States on April 3, 2026
★★★★★ 5
Great to keep in purse for when I have a dry mouth.
Flavor Name: Tart Cherry, Size: 3.85 Ounce (Pack of 1)
I suffer from dry mouth due to diabetes, and these help when I’m somewhere I can’t get to a water bottle quick enough.
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Reviewed in the United States on April 4, 2026