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Anonymous Posted on Sep 21, 2010

1995 Chevy Astro AWD, 4.3 V-6: I am going to replace the high-speed CV joint located at the front-end of the front drive shaft. I have the part, just need a step-by-step walkthru of how to replace it. Any help would be appreciated. (part no. is 421-80, if that helps)

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  • Anonymous Sep 22, 2010

    Wanted to make sure you understood that this is the CV joint on the center drive shaft, not the left or right axle!! :) there is a front and a rear drive shaft (it's AWD), this is the U-joint on the front end of the front drive shaft, that goes into the back of the transfer case. The place I ordered the part from called it the "high-speed cv joint".
    If you already knew all this, please disregard!! :)

  • Anonymous Sep 22, 2010

    I need to replace the "high-speed CV joint" located at the front end of the front drive shaft on my 1995 Chevy Astro, and would like detailed instructions. This is NOT one of the CV joints located near the front wheels!!!! It is the U-joint on the front end of the front drive shaft, between the front differential and the transfer case. There is a front drive shaft and a rear drive shaft on this AWD vehicle. We're not talking left and right here!! Hope that clears it up! :)
    Again, it's the front joint on the drive shaft that goes between the front diff and the transfer case. Another drive shaft goes from the transfer case to the rear end. Not the CV joint located at the front wheels!!! Thanks.

  • Anonymous Sep 23, 2010

    Please read my previous comments, I'm having no luck getting an answer here.....

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  • Posted on Sep 22, 2010
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Wow! This is a very detailed job. There is quite a bit to do. I would suggest going to the library and checking out the Chilton's manual. If you get instructions on here. Someone may leave out some steps. It is quite a job to change a CV joint. And sometimes takes an air hammer to get the ball joints off. And without the proper aligning tools you will need to have the vehicle aligned when you are done.

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  • Posted on Sep 23, 2010
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It's look at it and do it! theirs bolts holding the shaft to a flange on the transfer case, The car has to be lifted or crawl under it to get there. ( both ways the car needs to be made to not move as you work on it park isn't going to work.) these bolts are very tight and I use an Impac wrench (air gun) to remove them I heat them with a torch too and the air gun I use is very powereful. My lift that holds the car is a nice one too. I give $8000 for it. With these bolts out (4) I do the same thing on the other end. once it's out the bolts should either be new or at least cleaned and re-locktighted. they need to be real tight and locktighted. Some pureists say you shouldn't use an impac at all as the gearboxes can't take the pounding. ( hogwash as the slamming that you put them though spinning the tires then gripping puts all the power of the motor on them and they don't break and the air gun isn;t as powerful as the engine). Make sure you get the new shaft to set down good on the flanges as if cocked they'll shake real bad and cause somthing to break. or come loose and fall off ( read wreack the car) If your not handy doing this kind of work let someone that does it everyday do it and pay him with the money you make doing something that you know how to do and have the tools for.

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Visit http://Autozone.com and follow the directions to enter your vehicle model and year to access the free online repair guide section . Then , select steering and suspension and scroll down to the CV joint replacement procedure . It's free to download view and print .

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