Active standard | Published: 01/07/2026

SAE J3249

CVJ Efficiency Test Recommended Practice

Available languages: English

Available design: electronic design (pdf), Print design

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Detail information

Designation: SAE J3249

Publication date: 01/07/2026

Pages: 0

Country: American technical standard

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Anotation

This recommended practice describes the procedure to measure and report the operating efficiency for all types of constant velocity joints (including fixed and plunging/end motion type joints) used in cars, SUVs, and trucks. This includes halfshaft as well as propshaft applications. This does not apply to non-CV joints. Rotational inertia is not considered within the scope of this recommended practice.

This recommended practice provides a common method to quantify and report the operating efficiency characteristics of a CVJ. This practice does not apply to parasitic losses (spin loss, churning loss, or zero torque loss) as experienced on deactivated AWD/4WD systems. The losses in this condition are significantly less and require higher accuracy than what is required in this recommended practice.

SUBFILE: Automotive
TYPE OF DOCUMENT: Ground Vehicle Standard

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