Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.

Neapco · Drivetrain
4-5122
In stock · ships from Knoxville
The Neapco 4-5122 is a 5C series universal joint with four threaded caps and a wing bearing (DWT) design.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 1 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Universal fit
Fits heavy-duty truck and equipment driveshafts requiring a 5C series wing bearing U-joint with 1.688" bearing cap center line to center line of holes and 4.531" lock-up dimension. Specific vehicle applications are not verified.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 8 of 8.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It is used in heavy-duty truck driveshafts to transmit torque while allowing angular movement. You replace this U-joint when there is excessive play, vibration, or noise coming from the driveline. The joint has a 1.688-inch bearing cap center line distance and a 4.531-inch lock-up dimension.
Part Number: 4-5122
ALL THREADED U-JOINT
Category: Driveline
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more