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Old 10-08-2018, 07:47 PM   #1
jcondo
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77 K10 U joints?

So im in the process of changing front ball joints, rotors, wheel bearings, seals, and u joints in my 77 K10.
I have finished the passenger side with out any issues, just waiting on brake pads. I have the drivers side completely torn down and pressed the u joints out. Upon pressing in the new U joint into the shorter axle half I successfully broke the cap out.
Went to the parts store and purchased another one, got it installed but the caps are not flush with the yoke on either shaft. I attempted to install the axle but I cant get the u joint past the hub casing.

So my question is, did they use different u joints on the drivers side compared to the passenger side? The u joints I used are a 371 moog.

Thanks for any info.
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Old 10-08-2018, 10:15 PM   #2
B. W.
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Re: 77 K10 U joints?

Both sides use the same joint. 371 is the correct part number. The outside edge of the cap should have a slight chamfer on it. This allows it to clear the hole in the knuckle. I have had to relieve some knuckles when using cheap joints without the chamfer on some rigs - not GM specific. If there is a lot of rust or scale on the center bore that could be an issue too.
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Old 10-09-2018, 01:13 PM   #3
jcondo
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Re: 77 K10 U joints?

Thanks for the info, ill have to check on the u joint having a chamfer. once I get back up to the shop ill get a photo and show you the u joint in the axel.
Thanks again.
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Old 10-14-2018, 10:22 PM   #4
jcondo
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Re: 77 K10 U joints?

So I took the original one and the new one back to the part store. Showed them the difference and they still wanted to argue with me about how their flat topped u joint should fit into the steering knuckle. Well with the photos I had on my phone and them still wanting to argue with me about it, I told them I wont be spending any money there for a long time. Sad part is ive been buying most of my parts from them for over 20 years.

I ended up going home with their flat topped u joint (371). and got a block of wood and sledge and beat it in. Now since I did this and I cut into the steering knuckle I had to fix the gouges I made by spot welding and filing them down. I may not have needed to do this but I didn't want any extra places for debris to get into.

Napa has since contacted me and told me that the 2 employees I was dealing with about my issue would no longer be helping me in the future if I choose to come back in and purchase more parts from them. I did not contact Napa in any way, but I live in a small town of maybe 3k people so the owner heard about it within a day and called me personally about it. But for the mean time I told him I was gonna keep using Rock Auto because they don't argue with me and if I get the wrong part its my own fault.
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Old 10-14-2018, 10:26 PM   #5
jcondo
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Re: 77 K10 U joints?

photos of the flat top u joint
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Old 10-15-2018, 12:04 AM   #6
B. W.
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Re: 77 K10 U joints?

Sorry to hear you had issues with the parts house. Glad to see you got the u-joints in. If it makes you feel better, I've had similar issues with parts houses & with u-joints!
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Old 10-15-2018, 01:41 AM   #7
82C10step
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Re: 77 K10 U joints?

Many people that work at parts stores are not automotive enthusiasts and the old guys are becoming the dieing breed. I deal with it everyday.
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Old 10-30-2018, 11:37 PM   #8
jcondo
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Re: 77 K10 U joints?

I completely understand that they have no idea what they are talking about anymore. I showed them the photos, even took the broken u joint in that I had to show them what I wanted and they still were clueless. Ended up getting mad and walking out of Napa, going home and ordering one from suspension parts.com. Received the u joint and installed with no issues, my local Napa will no longer get any of my business.
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