AutoZone 2005 Chevrolet Truck Blazer 4WD 4.3L SFI OHV 6cyl | Repair Guides | Drive Train | Manual Transmission | Output Shaft Seal | AutoZone.com

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    2005 Chevrolet Truck Blazer 4WD 4.3L SFI OHV 6cyl

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    GM Camaro/Firebird 1993-1998 Repair Guide

    Output Shaft Seal

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    REMOVAL & INSTALLATION



    See Figures 1 and 2

    The output shaft seal controls transmission oil leakage around the driveshaft. Continued failure of this seal usually indicates a worn output shaft bushing. If so, there will be signs of the same wear on the driveshaft where it contacts the seal and bushing. The seal is available and is fairly simple to install, with the proper tool. The seal on the 5-speed is similar to the seal for the 6-speed manual transmission. There are differences in design, however the replacement procedure is basically the same. The only difference is the tool used to install the different seals.

    1. Raise and safely support the rear of the vehicle to minimize transmission oil loss when the driveshaft is removed.
    2.  
    3. Matchmark the position of the driveshaft. Unbolt the driveshaft from the differential and center support bearing, if equipped. Wrap tape around the bearing cups to keep them in place on the universal joint and slide the shaft out of the transmission.
    4.  
    5. Use the extension housing seal remover and a slide hammer to remove the old seal. Be careful not to insert the tool too far into the housing or the bushing will be damaged.
    6.  



    Click image to see an enlarged view

    Fig. Fig. 1: 5-speed manual transmission output shaft seal replacement

    To install:
    1. Use extension housing seal installation tool J 21426 (5-speed) or J 39440 (6-speed) to evenly drive the new seal into the housing. Make sure the tool only contacts the outer metal portion of the seal.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 2: On the 6-speed transmission, the output shaft seal is slightly different, but the procedure is essentially the same

    1. Install the driveshaft. Tighten the universal bearing cup retainer bolts to 15 ft. lbs. (20 Nm).
    2.  
    3. Carefully lower the vehicle.
    4.  

     
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