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Description
Synergy 4123KN Heavy-Duty Adjustable Ball Joint Kit (Knurled)Get the Synergy 4123KN Heavy Duty Adjustable Ball Joint Kit (Knurled) from GAP and upgrade your 2003 2013 Dodge Ram 2500 3500 4WD. After 5 years of development and over 100,000 test miles the Synergy Heavy Duty Adjustable Ram Ball Joints are here! This is the last set of ball joints you will ever have to buy. Tighten up your steering for good with Synergy's patent pending (# 16 020894) design which is fully adjustable, serviceable, and rebuildable
Get the Synergy 4123KN Heavy-Duty Adjustable Ball Joint Kit (Knurled) from GAP and upgrade your 2003-2013 Dodge Ram 2500/3500 4WD. After 5 years of development and over 100,000 test miles the Synergy Heavy-Duty Adjustable Ram Ball Joints are here! This is the last set of ball joints you will ever have to buy. Tighten up your steering for good with Synergy's patent-pending (# 16/020894) design which is fully adjustable, serviceable, and rebuildable without having to press the ball joints back out of the axle end forging yokes. These ball joints never have to come back out. Lower ball joint bearing surfaces are CNC machined from 4140 steel, heat treated, induction hardened, and ferritic nitrocarburized to make these the longest lasting, longest wearing ball joints on the market. Kit includes all 4 ball joints to service one truck and the adjuster tool for adjusting the preload on the lower ball joints.
Features:
Non-Knurled Ball Joint Housing
Contaminants And Eliminate Any Chance Of Tearing
Zerk-Fittings Included For Trouble-Free Maintenance
Lower Ball Joints Are Rebuildable On The Vehicle Without Removal
Hardened, And Ferritic Nitrocarburized For Extreme Wear Resistance
Lower Ball Joint Bearing Surfaces Are CNC Machined From 4140 Steel, Heat Treated, Induction
Low Profile Dust Boots Are Made From Thick Nitrobutile Rubber (NBR) To Protect The Joint From
Patent Pending Lower Ball Joints Are Adjustable So They Always Have The Correct Amount Of Preload
Best In Class Price/Performance Ratio
Designed To Last The Life Of The Vehicle
Never Need To Replace Ball Joints Again
Limited Lifetime Warranty
Contaminants And Eliminate Any Chance Of Tearing
Zerk-Fittings Included For Trouble-Free Maintenance
Lower Ball Joints Are Rebuildable On The Vehicle Without Removal
Hardened, And Ferritic Nitrocarburized For Extreme Wear Resistance
Lower Ball Joint Bearing Surfaces Are CNC Machined From 4140 Steel, Heat Treated, Induction
Low Profile Dust Boots Are Made From Thick Nitrobutile Rubber (NBR) To Protect The Joint From
Patent Pending Lower Ball Joints Are Adjustable So They Always Have The Correct Amount Of Preload
Benefits:
Tightens Sloppy SteeringBest In Class Price/Performance Ratio
Designed To Last The Life Of The Vehicle
Never Need To Replace Ball Joints Again
Limited Lifetime Warranty
4123KN Heavy-Duty Adjustable Ball Joint Kit Includes:
(2) Upper Ball Joints(2) Lower Adjustable Ball Joints
(1) Ball Joint Hardware Kit For All Joints
(1) Ball Joint Adjuster Wrench To Set Pre-Load
Notes:
Non-Knurled ball joints recommended for replacing non-knurled ball jointsDue to these ball joints being tight tolerance, metal on metal ball joints, proper fitment is critical. Using the wrong style of ball joints can cause significant steering issues. We always recommend installing non-knurled ball joints until non-knurled ball joints are no longer a press fit into the axle end forging bores. If your axle end forging bores have been enlarged to the point that non-knurled ball joints are no longer a press fit, knurled ball joints are required.
Use of the improper ball joint style for the axle housing voids our lifetime warranty. It is up to the installer to verify the proper ball joint style is being used.
Compatible with RCV axle shafts
Synergy 4119 High Performance Grease recommended
Limited Lifetime Warranty:
For the original purchaser, this warranty covers defects in materials or workmanship of the ball joint for the lifetime of the joint. Ball Joints are wear items and normal wear of the ball joint is not subject to this Limited Lifetime Warranty. The wear items of the ball joint will periodically need to be replaced once the adjustment in the joint is used up and are available separately as a ball joint rebuild kit. Length of time between rebuilds is subject to the use and build of the vehicle.
Applications:
2003-2013 Dodge Ram 2500 4WD2003-2013.5 Dodge Ram 3500 4WD
2006-2008 Dodge Ram 1500 Mega Cab 4WD
Note: 2013 Dodge Ram 3500's were a split year for production. If your truck has radius arms use Dodge Ram 2014+ pages
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 20 reviews
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Product Reviews
★★★★★ 5
Real leather, soft and lightweight
Color: Brown, Color: Brown
This medium sized leather tote bag is well made, with tight stitching; heavy duty, gunmetal colored hardware; and a thick, dark gray fabric lining on the inside. There are 2 short, rounded handles that do not fold down, and a narrow, flat, detachable crossbody strap that can be adjusted in length. The style is simple and classic, with a hand-dyed brown finish that will go well with most outfits. It's versatile, being suitable for work or everyday use. It can carry a small laptop or tablet, along with other essential items. There are no outside pockets, but inside there are several. The central compartment is spacious, with 2 slip pockets on one side. There are also 2 zippered pockets, with a large open pocket separating them. The top of the bag has a full, metal zipper that seems good quality. This bag is very attractive as well as functional, and though the leather feels lightweight the bag seems durable. Its listed price is a little high for my budget, but a coupon offer currently makes it a good value. I was very surprised that there is no logo or branding of any kind visible on the outside of this bag, and only one name label stitched to a pocket on the inside. Many bags I see have prominent names, symbols, or initials on the outside, and sometimes all over the inside lining as well. The simplicity of this bag is a refreshing change as it lets the quality speak for itself. I like it!
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Reviewed in the United States on January 5, 2026
★★★★★ 3
Great bag
Color: Brown, Color: Brown
This is a wonderful leather bag. It can be carried by handles or worn crossbody. It fits my 13" MacBook Pro perfectly though it doesn't have any particular padding to protect a laptop. I have a couple of nitpicks though for a bag that costs $98. 1/It's a shame that the handles can't lay down or disappear in some way when not in use. They just look a little goofy when you wear the bag across your body. And 2/the stitching is a little weird. The exterior shows the stitching for the inside pocket and I don't know that it's necessary. All in all it's a good bag but if I could return it I would consider doing so because of the way the handles stick up when worn crossbody. I do think, ultimately that's a dealbreaker for me.
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Reviewed in the United States on December 23, 2025
★★★★★ 5
This Bag Is Unbelievable - Serious Business
Color: Brown, Color: Brown
I’m a self-admitted bag enthusiast, and this one genuinely surprised me. I wasn’t familiar with the brand, but the quality is immediately apparent. The leather is soft yet substantial, giving it a premium feel without seeming fragile or flimsy.
The stitching is impeccable, and the front and back are cleanly designed with no unnecessary frills—just a timeless, well-constructed silhouette. It’s the kind of bag that people notice, whether you’re carrying it or someone sees it from across the room.
The strap was neatly packaged inside, and everything arrived in perfect condition. I looked it over carefully and couldn’t find a single flaw. In my opinion, this is a near-perfect everyday bag and an impressive value for the quality.
*** Photos are front of bag (same as back), side of bag & bottom of bag. As you can see the stitching, as well as everything else, is quite impressive. Love this bag!
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Reviewed in the United States on December 30, 2025
★★★★★ 4
Gorgeous Color!
Color: Coffee, Color: Coffee
I am very happy with the color of this purse the inside pockets and zipped pockets, a total of 4, allows for neat organization of all my items such as phone, cosmetics, sunglasses, tissues, perfume, mints and etc... I love the gun metal colored hardware. The zippers move smoothly. The crossbody strap is long enough for my 6' frame and sits right at my hip when I use the last buckle hole. All the stitching is complete and tight. Speaking of stitching, I removed a star because the inside pockets are sewn on and shows on the back of the purse. I don't like having to check if my purse is facing the right way. For the price of this purse the stitching should not be showing. The interior lining is a cloth-like fabric. The inside zipped pockets are full size and lay on top of each other. This is different from what I've seen in other purses. When the purse is full, the top pocket slightly covers the main compartment bottom from view. I will be sure to put something somewhat flat in that pocket to avoid this. There is no offensive odor from shipping. Because of the stitching issue, I cannot recommend to others without point this out.
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Reviewed in the United States on December 31, 2025
★★★★★ 5
Doctor Doctor-give me the news!!! This purse is…
Color: Black, Color: Black
Amazing!!! This is an updated review because the seller sent me a replacement.
I use this bag for photography. It’s easy to reach into and set down as needed. There’s room for one body and two lenses and multiple accessories. I use a wrist grip and do street photography. I don’t like to carry my camera around my neck and draw attention. This bag is perfect for keeping my camera in between shots.
The bags interior is super soft and the leather itself on the outside feels high-quality and is stitched very well. Being footed is an extra great quality so that I feel confident setting it down. The extra long strap is great, as a large bag like this needs to be worn as a crossbody for most people I upgraded to a wide strap for the weight of my camera system.
I always update my reviews in a year. So I will come back and let you know how it’s holding up!
(Old review)
***********Arrived with someone else’s complaint already prepared for me! What an entrance!! She was right, the tag and bag don’t match.
It is the bag I ordered but….
VERY VERY DAMAGED!!! For this much money, where is the quality control? Someone else’s return, and multiple gauges throughout the leather of the bag?
I uploaded about 5 different places where the leather is gauged-and then stopped photographing.
Sadly, I think this is a good bag - a bit overpriced, and small, the zipper is iffy as well but clearly the bag isn’t a keeper in this condition. Shame on the seller.
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Reviewed in the United States on January 10, 2025