Drivetrain - Front Differential Growl/Howl At 15-30 MPH: Overview

T-SB-0121-08

Rev1

June 30, 2008

Front Differential Growl/Howl/Rumble Noise at 15-30 MPH

Service Category
Drivetrain

Section
Axle/Differential

Market
USA





Applicability

TSB REVISION NOTICE

^ December 14, 2009 Rev1:

Key changes to the TSB are:

^ The Differential Carrier Assembly is being repaired instead of being replaced.

^ The Differential Case Sub-assembly Kit and Oil Seal have replaced the Front Differential Carrier Assembly in Parts Information.

^ Warranty Information has been updated.

^ SSTs have been updated in Required Tools & Equipment.

^ Repair Procedure has been updated and expanded from step 5 to the end.

Any previous printed versions of this service bulletin should be discarded.

Introduction

2007 - 2008 model year four-wheel drive Tundra trucks may exhibit a condition where a cyclic noise can be heard from the front of the vehicle between 15 and 30 mph (24 - 48 km/h) ONLY when driving in 2WD. This noise can be described as a howl growl grind or drone noise. Production changes have been implemented to help prevent this noise. Follow the repair procedure below to address this condition.





Warranty Information

APPLICABLE WARRANTY

^ This repair is covered under the Toyota Powertrain Warranty. This warranty is in effect for 60 months or 60,000 miles, whichever occurs first, from the vehicle's in-service date.

^ Warranty application is limited to occurrence of the specified condition described in this bulletin.





Parts Information








Required Tools & Equipment

NOTE

^ A mechanic's stethoscope or similar tool may be used in place of ChassisEAR(TM).

^ ChassisEAR(TM) may be ordered by calling Approved Dealer Equipment (ADE).