Click to zoom in
SKU: 4120
Synergy HD Knurled Front Ball Joint Set Dana 30/44 Jeep TJ/LJ/XJ/YJ/ZJ
This Synergy HD Knurled Front Ball Joint Set upgrades steering knuckles on Jeep models with Dana 30 or Dana 44 front axles. The kit includes two upper and two lower ball joints designed for TJ LJ XJ YJ ZJ. Knurled studs lock securely to resist rotation while grease fittings allow maintenance for long-term reliability in off-road use.
Key Features
- Knurled Studs – Grip steering knuckles to prevent spinning under load
- Heavy Duty Size – 1.25 inch OD uppers 1.625 inch OD lowers exceed OEM dimensions
- Greaseable Zerks – Fittings on both uppers and lowers for easy servicing
- Full Contact Design – Precision machined for smooth articulation and fit
- 30mm Ball Studs – Uppers feature high-strength studs for demanding conditions
- USA Made Steel – Robust construction tested for off-road durability
Specifications
| Detail | Value |
|---|---|
| Brand | Synergy Manufacturing |
| Type | HD Knurled Front Ball Joint Set |
| Compatibility | Jeep TJ/LJ/XJ/YJ/ZJ Dana 30/44 Front Axles |
| Part Number | 4120 |
| Weight | 4.60 lbs |
| Shipping Dimensions | 8.00 x 6.00 x 3.00 inches |
| Country of Origin | USA |
| Warranty | Limited Lifetime |
Whats Included
- 2 HD Upper Front Ball Joints
- 2 HD Lower Front Ball Joints
Product Notes
- Requires pressing out OEM joints and hammering knurled studs into C's for retention
- Compatible with stock height and lifts up to 4 inches
- Grease zerks installed on all joints no additional fittings needed
This Part Fits
| Year Range | Make | Model | Notes |
|---|---|---|---|
| 1987-1995 | Jeep | Wrangler YJ | Dana 30/44 Front |
| 1984-2001 | Jeep | Cherokee XJ | Dana 30 Front |
| 1993-1998 | Jeep | Grand Cherokee ZJ | Dana 30 Front |
| 1997-2006 | Jeep | Wrangler TJ | Dana 30/44 Front |
| 2004-2006 | Jeep | Wrangler Unlimited LJ | Dana 30/44 Front |
Why Choose Synergy?
- Engineered for rock crawling and trail durability
- Proven in competition and daily off-road driving
- Precision manufacturing in USA facilities
- Direct replacement with enhanced strength
Frequently Asked Questions
- Q: Does this set fit Dana 44 axles on TJ models?
- A: Yes fits both Dana 30 and Dana 44 front axles on listed Jeeps
- Q: Are installation tools required?
- A: Ball joint press recommended for removal and install
- Q: Can I grease these on the vehicle?
- A: Yes zerk fittings allow field greasing without disassembly
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Sturdy box 8 x 6 x 3 inches 4.60 lbs
Premium Quality Ball Joints for Enhanced Vehicle Performance
Ball joints restore controlled suspension movement and steering geometry on trucks, SUVs, muscle cars, Jeeps, and daily drivers. Shop OE-replacement and heavy-duty upper and lower ball joints for Silverado, F-150, Ram, Wrangler, Tacoma, 4Runner, Camaro, Mustang, Civic, Jeep, GM HD, and Ford Super Duty applications. Black Ops Auto Works carries 99 ball-joint SKUs across pressed-in replacements, bolt-in service kits, heavy-duty off-road upgrades, control-arm replacement joints, boots, and specialty steering components. Filter by year, make, model, trim, engine, and drivetrain before ordering. What Ball Joints Do Ball joints connect the control arm to the steering knuckle while allowing the suspension to move and the wheel to steer. Worn joints can cause steering looseness, uneven tire wear, clunks, and poor alignment stability. Upper and Lower Locations Many vehicles use upper and lower ball joints, but the configuration varies by suspension design. Verify the exact axle position ...
View Premium Quality Ball Joints for Enhanced Vehicle Performance Products
Suspension
Suspension parts and complete kits for cars, trucks, SUVs, Jeeps, and off-road builds are stocked at Black Ops Auto Works. Shop coilovers, lowering springs, lift kits, leveling kits, shocks and struts, sway bars, control arms, tie rods, ball joints, bushings, chassis bracing, alignment hardware, air suspension, and complete stage kits from Bilstein, KW, Ohlins, Fox, KING, ICON, BC Racing, Silvers, Eibach, H&R, Swift Springs, Whiteline, Energy Suspension, Moog, SPC Performance, Rough Country, ReadyLIFT, BDS, Skyjacker, Air Lift, Firestone, and Black Ops Auto Works. Start with a matched shock and spring package or a full coilover kit, then layer in sway bars, chassis bracing, and camber adjustment hardware. Every part is filterable by year, make, model, trim, and drivetrain to confirm fitment before ordering. What This Category Covers Suspension is the highest-leverage handling upgrade on any vehicle. A properly matched shock, spring, and sway bar package produces measurable i...
View Suspension Products
Synergy Mfg
Synergy Mfg Jeep suspension and heavy-duty steering parts for Wrangler JK, JL, Gladiator JT, Ram 2500, Ram 3500 and Super Duty builds are stocked at Black Ops Auto Works. Shop control arms, track bars, drag links, tie rods, ball joints, lift springs, steering stabilizer mounts, shock mounts and steering correction kits. Every Synergy Mfg product is filterable by year, make, model, wheelbase, axle and suspension configuration so the correct off-road component ships the first time. Black Ops Auto Works carries 180 Synergy Mfg SKUs across suspension, steering, axle and lift-system hardware. What This Synergy Mfg Collection Covers Synergy Mfg develops heavy-duty suspension and steering upgrades for solid-axle Jeeps and trucks. Adjustable arms, track bars, steering kits and mounting solutions help correct geometry and improve durability on lifted or hard-used vehicles. Control arms and track bars Adjustable control arms set caster, pinion angle and wheelbase after a lift. Track bars ...
View Synergy Mfg Products