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"Magical" U-Joints ?

Discussion in 'Mechanic's Corner' started by bubbatrucklover, Jun 6, 2019.

  1. bubbatrucklover

    bubbatrucklover Heavy Metal Red Neck

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    So while rounding up parts and fluids to do my t-case/trans swap I thought maybe I should swap out the u-joints even though they are "new" (replaced less then a year ago) and I came across a few things. ONE did Moog merge with or buy out a company call Precision? At the parts store that USED to carry Moog (which the current personal swear never happened :wtf?:) offer Precision. Rock Auto has parts listed as Moog/Precision.

    and TWO: some U-joints are as much as forty FWONKIN' dollars at the parts store because they are :quote:specially coated for aluminum drive shafts:quote:. When the fwonk did that become an issue:dunno:.

    I've had the same aluminum driveshaft in the same '02 Silvy (which is from the factory) and NEVER had that question asked nor presented as an option/problem fixer. So is this "legit" or did they rub snake oil on it to jack up the price?:gunguy:

    I also have a "hi-bred" u-joint in that the yoke on the rear end and drive shaft are different (3/4 ton rear end) so I bought the 2 (at the time 2 options) and swapped 2 of the caps. I HOPE I can find the boxes and part #s to order from Rock Auto. MUCH cheaper. Of course they weren't :quote:specially coated for aluminum drive shafts:quote:.

    Thanks for any insight on these. :cheers:
     
    Last edited: Jun 6, 2019
  2. OldCracker29

    OldCracker29 I've been knocked down drug out and left for dead

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    Must be some sort of galvanic corrosion reaction or something. Like using aluminum and copper together, that's a big :nonod:
     
  3. bubbatrucklover

    bubbatrucklover Heavy Metal Red Neck

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    Having somewhat of an electrical background I understand that. You use Noalox if wiring a copper device to aluminum wiring or use an alumicon (sp?) which has the noalox in it but, (as I said) this is the FIRST time I've even seen this as an option for u-joints and certain drive shafts.

    In all fairness it could have always been there and no one asks and I didn't notice. :dunno:
     
  4. tjoyce81

    tjoyce81 I'm NEW... What now?

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    Just saw this post. YES, aluminum drive shaft u-joints should have the coating on them - and they are more expensive.
    Galvanic corrosion will happen if you use an un-coated u-joint. This has been around since aluminum shafts have been.
    Also, never heat an aluminum drive shaft to get the u-joint out...You'll be sorry if you do.
     
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  5. bubbatrucklover

    bubbatrucklover Heavy Metal Red Neck

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    Thanks for the insight. :cheers: Had no intention of heating the drive shaft BUT, THANK YOU for PRE warning SHOULD the urge strike me. :facepalm:
     

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