Best Penetrant to Remove Differential U-Bolts?

Shop, Garage and Tools

  1. missing linc

    missing linc Loose nut behind the wheel FABO Gold Member

    Messages:
    1,345
    Likes Received:
    1901
    Joined:
    Feb 17, 2019
    Location:
    Southern Alberta Canada
    Local Time:
    3:39 AM
    Be sure to measure them first, I made that mistake once or twice.
     
    • Agree Agree x 2
    • RustyRatRod

      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

      Messages:
      60,008
      Likes Received:
      31141
      Joined:
      Jun 7, 2010
      Location:
      Georgia
      Local Time:
      5:39 AM
      I don't disagree. Plus, you are not supposed to reuse those U-bolts. If they are tough to get off, I throw them away. If they break loose easily, I will reuse them......but again, they are supposed to be a one time use.
       
      • Agree Agree x 3
      • billccm

        billccm Well-Known Member

        Messages:
        121
        Likes Received:
        88
        Joined:
        May 13, 2018
        Location:
        Tucson
        Local Time:
        2:39 AM
        Mancini has the correct U Bolts.
         
        • Agree Agree x 1
        • Kern Dog

          Kern Dog Well-Known Member

          Messages:
          4,125
          Likes Received:
          5540
          Joined:
          May 23, 2010
          Location:
          Granite bay CA
          Local Time:
          2:39 AM
          Screw that.
          I reuse them all the time. Stuff over here doesn't rust and break when you work on it.
           
          • Agree Agree x 1
          • 1969383S

            1969383S FABO Gold Member FABO Gold Member

            Messages:
            5,485
            Likes Received:
            2539
            Joined:
            Jan 8, 2012
            Location:
            Cumming, GA.
            Local Time:
            5:39 AM
            like said!
            use what you like but give it some time to work. You can't reduce 50+ years of crude in 10 minutes!
             
          • jomoper

            jomoper Mope or Nope

            Messages:
            2,994
            Likes Received:
            187
            Joined:
            Aug 18, 2006
            Location:
            NorCal.S.F.bay area
            Local Time:
            2:39 AM
            Of all the stuff I've used PB blaster has always worked best. Except every time I use it My sense of smell is messed up for at least a day.
             
          • MoparMike1974

            MoparMike1974 FABO Gold Member FABO Gold Member

            Messages:
            2,192
            Likes Received:
            1519
            Joined:
            Jun 16, 2017
            Location:
            Maryland
            Local Time:
            5:39 AM
            I cant stand the smell of PB blaster. One drop gets on you and you smell it for a week.
            Kroil is the best, hands down.
             
            • Agree Agree x 2
            • rustycowll69

              rustycowll69 Well-Known Member

              Messages:
              2,165
              Likes Received:
              969
              Joined:
              Feb 19, 2016
              Location:
              Pacific northwest
              Local Time:
              2:39 AM
              I agree. Personally, I prefer Mopar Heater Control Solvent. It was made for heat risers, I think, but it'll work on anything rusty. Heat was mentioned, and that can help. I'd also suggest an impact gun w/ 6pt impact socket, but like the quoted post, work the nut gradually back and forth carefully. Be patient. It is usually worth trying to save the factory u-bolts, because aftermarket bolts are not flattened at the u-bend and are not friendly to the housing tube like the oem bolts.
               
            • lemondana

              lemondana BlackDart

              Messages:
              395
              Likes Received:
              198
              Joined:
              Dec 7, 2007
              Location:
              Southeast NE
              Local Time:
              3:39 AM
              The U bolt nuts are a severe locknut. After you get 2 or 3 nuts off you will just go buy new U bolts. AMK has the correct flattened U bolts and those tall lock nuts.
               
              • Agree Agree x 1
              • lemondana

                lemondana BlackDart

                Messages:
                395
                Likes Received:
                198
                Joined:
                Dec 7, 2007
                Location:
                Southeast NE
                Local Time:
                3:39 AM
                Again, AMK has the correct flattened crosshatch bolts in 2 different lengths and the correct tall lock nuts. AMK has a big paper catalog for like $20.00 or $25.00. Get online, order the bolts and nuts and one of their catalogs, It has all of the neat OE bolts and nuts and other assorted for GM, Ford, and Mopar.. It is well worth the money!
                 
              • RustyRatRod

                RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

                Messages:
                60,008
                Likes Received:
                31141
                Joined:
                Jun 7, 2010
                Location:
                Georgia
                Local Time:
                5:39 AM
                There you go. Even though they are supposed to be one time use, I agree with you. As long as they break loose easily, I'll reuse them too. I coat the threads with RTV when I go back. They won't rust up then.
                 
                • Like Like x 1
                • RustyRatRod

                  RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

                  Messages:
                  60,008
                  Likes Received:
                  31141
                  Joined:
                  Jun 7, 2010
                  Location:
                  Georgia
                  Local Time:
                  5:39 AM
                  There's really no "correct" on this. I've torn down a LOT of cars and seen both types of U bolts on the same model.

                  I would be curious to see what @Oldmanmopar has seen on this. That guy has parted out a bunch of cars. I'm sure he'd have some good input.
                   
                • billccm

                  billccm Well-Known Member

                  Messages:
                  121
                  Likes Received:
                  88
                  Joined:
                  May 13, 2018
                  Location:
                  Tucson
                  Local Time:
                  2:39 AM
                • fklskv

                  fklskv Well-Known Member

                  Messages:
                  1,111
                  Likes Received:
                  584
                  Joined:
                  Aug 14, 2011
                  Location:
                  Lackawanna, NY
                  Local Time:
                  5:39 AM
                  • Agree Agree x 2
                  • Tooljunkie

                    Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

                    Messages:
                    14,186
                    Likes Received:
                    13157
                    Joined:
                    Jul 22, 2017
                    Location:
                    Manitoba
                    Local Time:
                    4:39 AM
                    the u-bolts aren't supposed to be tightened so they damage axle tubes. the highest I have seen for late models is like 80 foot-lbs
                    locktite also serves as an anti-seize by sealing the threads to prevent corrosion
                     
                  • Car Nut

                    Car Nut Mopar Master

                    Messages:
                    13,330
                    Likes Received:
                    57275
                    Joined:
                    Dec 28, 2018
                    Location:
                    Zombieland
                    Local Time:
                    3:39 AM
                    Dang, that’s high, even though the books says 45 ft lbs.

                    BA21470D-EA39-4740-A18A-593B44C1A625.jpeg
                     
                  • Tooljunkie

                    Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

                    Messages:
                    14,186
                    Likes Received:
                    13157
                    Joined:
                    Jul 22, 2017
                    Location:
                    Manitoba
                    Local Time:
                    4:39 AM
                    think the f150's, three leaf pack is what I was referring to.
                    too tight on the A bodies does more harm than good.
                     
                  • Marcohotrod

                    Marcohotrod Well-Known Member

                    Messages:
                    2,408
                    Likes Received:
                    616
                    Joined:
                    Mar 21, 2015
                    Location:
                    Massachusetts
                    Local Time:
                    5:39 AM
                    Calvert and I like 65 foot pounds. I found dumping the clutch with slicks was better with more than 45
                     
                  • mopowers

                    mopowers Well-Known Member

                    Messages:
                    4,685
                    Likes Received:
                    1789
                    Joined:
                    Feb 15, 2006
                    Location:
                    West Sacramento, CA
                    Local Time:
                    2:39 AM
                    Liquid Wrench did the best in this guy's test, with acetone/ATF in 2nd. Kroil did the WORST. FYI-



                    Here's part 2. In this one, deep creep (sea foam) did the best, with CRC very close behind.

                     
                    • Like Like x 1
                    • dartfreak75

                      dartfreak75 Restore it, Dont part it! FABO Gold Member

                      Messages:
                      7,384
                      Likes Received:
                      5150
                      Joined:
                      Aug 10, 2011
                      Location:
                      Virginia
                      Local Time:
                      5:39 AM
                      I dont think iv ever gotten a u bolt off without breaking it off. I like Kroil and pb blaster but I havent bought a can of pb blaster in years kroil is my go to because I get it for free. For ubolts I'd just cut them off i wouldn't waste my free kroil on it lol.
                       
                      • Agree Agree x 3
                      • dartfreak75

                        dartfreak75 Restore it, Dont part it! FABO Gold Member

                        Messages:
                        7,384
                        Likes Received:
                        5150
                        Joined:
                        Aug 10, 2011
                        Location:
                        Virginia
                        Local Time:
                        5:39 AM
                        I really like that guy I really enjoy his tests.
                         
                      • TrailBeast

                        TrailBeast AKA Mopars4us on Youtube

                        Messages:
                        21,285
                        Likes Received:
                        8750
                        Joined:
                        Mar 11, 2011
                        Location:
                        Arizona
                        Local Time:
                        2:39 AM
                        This is the ticket right here, no matter what lube you use.
                        I use a drill with about a 3 inch round wire brush to clean the threads before removing the nuts.
                        Note that I just did three cars of U bolts and they all came off easy with cleaned threads.
                        Didn't break or trash threads on any of them.
                         
                        • Like Like x 1
                        • RustyRatRod

                          RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

                          Messages:
                          60,008
                          Likes Received:
                          31141
                          Joined:
                          Jun 7, 2010
                          Location:
                          Georgia
                          Local Time:
                          5:39 AM
                          In that video above, he is using Fluid Film in the wrong application, that's why it does not work well. It's not made for use as a penetrating oil, even though it says that as one of the uses on the label. It's best use is for coating parts for storage so they will not rust. For that, it is badass. I like that guy's tests, too. Look how well the Sea Foam does. I've been tellin yall that stuff is the shizzle.
                           
                          • Agree Agree x 3
                          • Texas Red

                            Texas Red Old Flunky FABO Gold Member

                            Messages:
                            25
                            Likes Received:
                            20
                            Joined:
                            Mar 25, 2020
                            Location:
                            Lake Corpus Christi
                            Local Time:
                            4:39 AM
                            Acetone & tranny fluid gets my vote...What Brian6pack said & others....It works very well. And yes New U Bolts. Cheap insurance
                             
                            • Agree Agree x 1
                            • Tooljunkie

                              Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

                              Messages:
                              14,186
                              Likes Received:
                              13157
                              Joined:
                              Jul 22, 2017
                              Location:
                              Manitoba
                              Local Time:
                              4:39 AM
                              Fluid film if you arent in a hurry.
                              But a little heat improves capillary action greatly. I always keep a can around.
                               
                            1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                              By continuing to use this site, you are consenting to our use of cookies.