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Engine Controls - High Speed Vibration

Bulletin No.: 006/00
Issued: 12/14/02
Revised:

Section:
05

Applicable Model/s
1998 - 2000 B-3000

Subject:
VIBRATION/TRANSMISSION LEAK

APPLICABLE MODEL(S)/VINs
All 1998 - 2000 B-3000 4X2.

DESCRIPTION

Some B3000 4X2 models may have a vibration at high speeds which may cause the transmission extension housing to leak or the transmission extension housing bushing to move out of position or become damaged. This may be caused by the calibration in the Powertrain Control Module (PCM). A revised PCM is available which reduces maximum speed to 90 M.P.H. (145 km/h) for gasoline vehicles and 94 mph (150 km/h) for Flex Fuel Vehicles (FFVs). This will reduce the possibility of vibrations.

Customers having this concern should have their vehicle repaired using the following procedure.

REPAIR PROCEDURE

1. Verify customer concern.

2. Check for Diagnostic Trouble Codes (DTCs) and repair as necessary per the Workshop Manual (01-01 TROUBLESHOOTING ([On-Board Diagnostic Tests]).

3. Remove rear propeller shaft and inspect for yellow index (alignment) marks where the propeller shaft and differential companion flange come together.

- If the yellow marks are present, proceed to STEP 4.

- If the alignment marks are not present, apply alignment marks (03-15 REAR PROPELLER SHAFT [4X2] REMOVAL/INSTALLATION).

4. Inspect the extension housing bushing for damage or out-of-location within the bore.

- If vehicle has an automatic transmission (AT) and the bushing IS in the proper location, remove the transmission oil pan and inspect the fluid.

^ If HEAVY contamination is present or fluid is burnt, replace the transmission. Flush the transmission cooler line system forward and backward (lines only) and replace radiator.

^ If MINIMAL contamination is present, replace the extension housing and gasket. Clean the transmission oil pan and install a new transmission fluid pan gasket. Reinstall transmission oil pan and flush transmission cooling system forward and backward (lines and cooler).

- If vehicle has an automatic transmission and the bushing IS NOT in the proper location, replace the transmission.

^ If HEAVY contamination is present, flush the transmission cooler line system forward and backward (lines only) and replace Radiator.

^ If MINIMAL contamination is present, flush transmission cooling system forward and backward (lines and cooler).

- If vehicle has a manual transmission (MT) and the extension housing bushing IS in the proper location, drain the transmission oil, inspect fluid for contamination, and determine if fluid is burnt.

^ If HEAVY contamination is present or fluid is burnt, replace the transmission.

^ If MINIMAL contamination is present, drain the transmission fluid, replace the extension housing and refill with Automatic Transmission Fluid.

- If vehicle has a manual transmission and the extension housing bushing IS NOT in the proper location within the bore, replace the transmission.

5. Install a new propeller shaft.

Note
^ Be sure that the propeller shaft and differential companion flange alignment marks are aligned.

6. Fill transmission to the proper level using Automatic Transmission Fluid (ATF).

7. Locate the PCM Catch Word on the firewall adjacent to the PCM, or on the white tag on the PCM, and obtain correct replacement PCM for vehicle application (refer to the PCM Reference Chart in PART(S) INFORMATION).





Note
^ If the PCM Catch Word is not listed in the "CURRENT CATCH WORD" column of the PCM Reference Chart, do not replace the PCM. The PCM has already been updated, or the vehicle was built with the updated PCM.

8. Replace PCM (01-40 POWERTRAIN CONTROL MODULE REMOVAL/INSTALLATION).

Note
^ Install the Authorized Modification Label on replacement PCM (label packaged with PCM). Enter the date of the replacement, dealer code, and new catch word found on PCM Label.

^ For PATS equipped vehicles, refer to Workshop Manual (section 09-40 POWERTRAIN CONTROL MODULE INITIALIZATION. Verify all of the customer's keys start the vehicle.

9. Verify the repair.





PART(S) INFORMATION





Locate Catch Word" on vehicle firewall adjacent to PCM, or on the white tag on original PCM. Use the chart to determine the correct PCM.








WARRANTY INFORMATION

Note
^ This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.





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