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.

Spicer · Drivetrain
6-40-521
In stock · ships from Knoxville
This is a splined tube shaft (also called a stub shaft) used in Spicer 1710 series heavy‑truck driveshafts.
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.
Other applications
Other applications
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 1 of 1.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It welds into the end of a 4.000‑inch diameter driveshaft tube with a .134‑inch wall and provides the male spline that engages the slip yoke. The spline allows the driveline to change length as the suspension moves, and this shaft is typically replaced when the splines become worn, causing driveline vibration or slack.
Part Number: 6-40-521
10 9/16 4 X 134 TUBE SHAFT
Category: Driveline
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more