Spicer Dana 60 Lower Kingpin Bearing Cap
37299
The Spicer Dana 60 Lower Kingpin Bearing Cap is an OE-style replacement component designed for traditional Dana 60 kingpin front axle steering knuckles. Also known as the lower kingpin trunnion cap, this component mounts to the bottom of the steering knuckle and supports the lower kingpin bearing assembly. Whether you're rebuilding a Dana 60 front axle, replacing damaged steering components, or restoring an older Chevy, Dodge, Ford, or GMC truck, this genuine Spicer replacement helps maintain the proper fit and support of the kingpin steering system.
The lower bearing cap is an important part of the knuckle assembly, retaining the lower bearing components and helping maintain proper steering operation under load. Replacing a worn, cracked, or damaged cap during a kingpin rebuild helps restore the integrity of the steering assembly. Inspect the lower bearing, race, kingpin, and knuckle mounting surfaces during installation to ensure the complete assembly is in good condition.
Includes:
- (1) Spicer Dana 60 Lower Kingpin Bearing Cap
Important: This listing includes one lower kingpin bearing cap only. The kingpin bearing, race, seal, and other steering components are not included unless separately specified. Designed for traditional Dana 60 kingpin front axle knuckles, not later ball-joint Dana 60 applications.
Specifications
| Manufacturer | Spicer / Dana |
|---|---|
| Part Number | 37299 |
| Superseding Part Number | 070SC128 |
| Product Type | Lower Kingpin Bearing Cap / Lower Trunnion Cap |
| Axle Platform | Dana Spicer 60 |
| Steering Knuckle Type | Kingpin |
| Mounting Position | Lower Steering Knuckle |
| Axle Position | Front |
| Material | OE-Spec Steel Construction |
| Installation Type | Bolt-On Lower Kingpin Bearing Cap Replacement |
| Primary Application | Dana 60 Kingpin Front Axle Rebuilds, Steering Knuckle Service & Heavy-Duty Off-Road Builds |
| Required Components | Compatible Dana 60 Kingpin Knuckle, Lower Bearing Assembly & Mounting Hardware |
| Known Incompatibilities | Ball-Joint Dana 60 Knuckles; Upper Kingpin Components; Non-Dana 60 Axle Applications |
| Quantity | One Lower Bearing Cap |
Technical Note: Spicer part number 37299 is listed as superseded by 070SC128. Confirm current replacement availability and interchange before ordering.
Fitment
Designed for select Dana 60 kingpin front axle applications found in Chevrolet, Dodge, Ford, and GMC heavy-duty trucks. Vehicle year and model alone do not guarantee compatibility. Confirm the installed axle uses traditional kingpin steering knuckles before ordering.
| Make | Model | Year Range | Axle Application |
|---|---|---|---|
| Chevrolet | K30 | 1977–1986 | Dana 60 Kingpin Front Axle |
| Dodge | W200 | 1979–1980 | Dana 60 Kingpin Front Axle |
| Dodge | W250 | 1981–1993 | Dana 60 Kingpin Front Axle |
| Dodge | W300 | 1979–1980 | Dana 60 Kingpin Front Axle |
| Dodge | W350 | 1981–1993 | Dana 60 Kingpin Front Axle |
| Ford | F-350 | 1979–1991 | Dana 60 Kingpin Front Axle |
| GMC | K35 | 1977–1978 | Dana 60 Kingpin Front Axle |
| GMC | K3500 | 1979–1986 | Dana 60 Kingpin Front Axle |
Fitment Notes:
- Fits compatible Dana 60 kingpin front axle steering knuckles
- Installs in the lower position beneath the steering knuckle
- Designed to support the lower kingpin bearing assembly
- Not compatible with Dana 60 ball-joint steering knuckles
- Not a replacement for the upper kingpin spring, bushing, or cap assembly
- Does not include the lower kingpin bearing or race
- Verify axle identification, knuckle configuration, and original part number before ordering
- Confirm Spicer 37299 and 070SC128 interchange for the specific axle application
- Inspect the kingpin, bearing, race, and mounting surfaces during installation
Builder Note: Not every Dana 60 front axle uses kingpin steering knuckles. Later Dana 60 applications commonly use ball joints, and those components are not interchangeable with traditional kingpin assemblies. If you're rebuilding a swapped or custom axle, identify the actual knuckle and axle components rather than relying on the vehicle model year.
FAQ
What does the Spicer 37299 lower kingpin bearing cap do?
The lower kingpin bearing cap mounts beneath the Dana 60 steering knuckle and supports the lower kingpin bearing assembly. It is an important component in maintaining the integrity and proper operation of the kingpin steering system.
Will this fit my Dana 60 front axle?
This cap is designed for compatible traditional Dana 60 kingpin front axle knuckles. It does not fit every Dana 60 because later axle generations commonly use ball-joint steering knuckles. Verify your axle and knuckle configuration before ordering.
Is Spicer 37299 the same as 070SC128?
The supplied product information identifies Spicer 070SC128 as the superseding part number for 37299. Confirm the current Spicer replacement listing and application compatibility before ordering.
Does this cap fit the upper or lower kingpin?
This part fits the lower kingpin position on the Dana 60 steering knuckle. It is not designed to replace the upper kingpin spring, bushing, or cap components.
Does the Spicer 37299 include the kingpin bearing?
No. This listing includes one lower kingpin bearing cap only. The lower kingpin bearing, race, and other rebuild components are separate unless specifically included in another kit.
What are the signs of worn Dana 60 kingpin components?
Common symptoms include excessive steering knuckle movement, loose steering, uneven tire wear, and abnormal bearing noise. Inspect the complete kingpin assembly to identify which components are worn before replacing parts.
Can I use this cap when rebuilding a Dana 60 kingpin axle?
Yes. Replacing a damaged or worn lower bearing cap is part of restoring a compatible Dana 60 kingpin steering knuckle. Inspect the lower bearing, race, kingpin, and mounting surfaces during the rebuild.
Will this fit a Ford F-350 Dana 60?
This cap is listed for select 1979–1991 Ford F-350 Dana 60 kingpin front axle applications. Confirm the installed axle and steering knuckle design because Ford used different front axle configurations across model years.
Can this part be used on custom rock crawler or tube chassis builds?
Yes, provided the build uses a compatible Dana 60 kingpin steering knuckle. Many custom off-road vehicles use older Dana 60 axle components, but the actual knuckle configuration determines compatibility.
What should I inspect when replacing a lower kingpin bearing cap?
Inspect the lower kingpin bearing and race, kingpin surface, knuckle mounting area, and cap fasteners for wear, corrosion, cracking, or damage. Follow the appropriate Dana/Spicer service procedures and torque specifications during installation.