M/T - Gear Rattle In High Temperature Conditions
NO: 21-04-98GROUP: Transmission
DATE: Feb. 20, 1998
SUBJECT:
Manual Transmission Gear Rattle At Operating Temperatures
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 21-13-97, DATED NOV. 7, 1997, WHICH SHOULD BE REMOVED FROM YOUR FILES AND NOTED IN THE 1997 TECHNICAL SERVICE BULLETIN MANUAL (PUBLICATION NO.81-699-98004). 1997 MODELS HAVE BEEN ADDED AND A NEW LABOR OPERATION NUMBER HAS BEEN ADDED. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS**.
MODELS:
1995 - **1997** (BR) Ram Trucks
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH AN 8.0L ENGINE AND MANUAL TRANSMISSION.
SYMPTOM/CONDITION:
Gear rattle may occur when ambient temperatures are high, the transmission is at operating temperature and the vehicle operator accelerates in 4th or 5th gear from approximately 30 to 55 mph.
Neutral gear rattle may occur when ambient temperatures are high, the transmission is at operating temperature with the engine idling, and the transmission in neutral with the clutch pedal released.
DIAGNOSIS:
NOTE:
DIAGNOSIS MUST OCCUR WHEN THE TRANSMISSION IS AT FULL OPERATING TEMPERATURE.
With the vehicle fully warmed up and stopped, apply the parking brake. With the transmission in neutral and the engine at idle, depress and release the clutch pedal (disengage and engage the clutch). If the gear rattle sound goes away when the clutch pedal is depressed and held down, perform the Repair Procedure.
NOTE:
YOU MUST REMOVE YOUR FOOT FROM THE CLUTCH PEDAL AFTER RELEASING IT TO PERFORM A PROPER DIAGNOSIS.
Also check for transmission gear rattle by releasing the parking brake and driving the vehicle, being sure to accelerate from 30 to 50 mph in 4th gear and then again in 5th gear. If a gear rattle sound is heard while accelerating from 30 to 50 mph in 4th or 5th gear, perform the Repair Procedure.
PARTS REQUIRED:
NOTE:
TRANSFER CASES BUILT PRIOR TO MAY 6, 1996 HAVE AN OUTPUT SHAFT THAT IS 1.33 IN. IN DIAMETER WITH 32 SPLINES. TRANSFER CASES BUILT AFTER MAY 5, 1996 HAVE AN OUTPUT SHAFT THAT IS 1.55 IN. IN DIAMETER WITH 31 SPLINES.
REPAIR PROCEDURE:
This bulletin involves installing a revised clutch disc and propshaft.
1. Using the procedures outlined in the appropriate service manual, install revised clutch disc p/n 52107666 and the appropriate revised propshaft specified in the Parts Required section of this bulletin.
NOTE:
DO NOT REUSE THE ORIGINAL REAR U-JOINT BOLTS OR STRAPS.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No:
06-20-01-97 Clutch Disc Replace 2.6 Hrs.
Optional Equipment:
06-20-01-63 Equipped with 4WD 0.8 Hrs.
**06-20-01-60 Equipped With A Skid 0.2 Hrs.**
Plate
FAILURE CODE: P8 - New Part