1. khryslerkid

    khryslerkid FBBO Gold Member FBBO Gold Member

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    742 Sure Grip

    Any options other than buying a new unit? They're $175
    20200218_194200.jpg

    Is this a normal wear pattern or is the flat spot on the one gear causing this?
    20200218_175423.jpg
     
  2. 5.7 hemi

    5.7 hemi FBBO Gold Member FBBO Gold Member

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    I think Dr Diff may have what ya need.
     
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    • khryslerkid

      khryslerkid FBBO Gold Member FBBO Gold Member

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      I know he does. I just hate to give him anymore of my money :D

      Don't know if a used set of gears would be a good thing or not?
       
    • davek

      davek FBBO Gold Member FBBO Gold Member

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      Dr Diff is a good guy send pics to him and ask him what he thinks. I did my 8 3/4 and he didnt try to sell me anything other then what I needed.
       
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      • Demonic

        Demonic Well-Known Member

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        ^ This. If not Cass, then a driveline guy, 4WD guy, someone who works on that all day. I'm no expert, but it looks like an odd failure. I'd want to know why it happened.
         
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        • Fran Blacker

          Fran Blacker FBBO Gold Member FBBO Gold Member

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          The cost of new parts may add up to the cost of a new SG, unfortunately .:(
           
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          • Fran Blacker

            Fran Blacker FBBO Gold Member FBBO Gold Member

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            • 5.7 hemi

              5.7 hemi FBBO Gold Member FBBO Gold Member

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              If I remember right, the kit is $175, so it’s not that pricey.
               
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              • khryslerkid

                khryslerkid FBBO Gold Member FBBO Gold Member

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                That's the thing I'm already into it for more than I want to be and can afford at the moment. The ebay add is Dr Diff.

                I wouldn't deal with anyone but Cass. He's the best and is priced right.

                If you have the extra $$$ Lol

                I hate using credit cards but I might have too.
                 
              • Kern Dog

                Kern Dog FBBO Gold Member FBBO Gold Member

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                Yeah...If you call the guy, set aside about a half hour.
                That guy likes to talk.
                I'm amazed that he gets much done because he really takes the time to explain stuff, so much so, I find myself trying to cut things short to let him get back to work!
                 
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                • khryslerkid

                  khryslerkid FBBO Gold Member FBBO Gold Member

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                  Believe it or not, there were shims behind the front bearing. One was broke and I found the small piece in the nose of the housing. It might have found it's way into the spider gear and chipped it off. There isn't any scar on the broken shim piece though.
                  20200216_181133.jpg 20200216_181200.jpg
                   
                • 493 Mike

                  493 Mike FBBO Gold Member FBBO Gold Member

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                  I've built a lot of 8 3/4s in the last 50 years and never found a broken shim!
                  Mike
                   
                • dvw

                  dvw Well-Known Member

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                  I've broke shims in a Dana. Your pinion has been moving forward and back. Pounded the shim out.
                  Doug
                   
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                  • khryslerkid

                    khryslerkid FBBO Gold Member FBBO Gold Member

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                    So finding a shim behind the front, small bearing, is normal?

                    I checked the preload before disassembly (no ring assembly) and it was just under 2 inch pounds. That's enough for pinion walk. Ring and pinion was worn to .012 backlash. Bearings were severely worn also.
                     
                  • john-9

                    john-9 Member

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                    the shim is used to set the preload on the pinion bearings in the 742 case --- just get the new internal powerlock kit and be done --- replace your clutches and bearings and if the ring and pinion gear is not damaged you will be good to go.
                     
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                    • vance.dykes

                      vance.dykes Well-Known Member

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                      check this out to help you understand what and how. i have used used gears and that is what a guy has to do to keep it on the road then do it. go to you tube and my mopar all kind of vids from dealer training.

                       
                    • HEMI-ITIS

                      HEMI-ITIS STREETER on LI FBBO Gold Member

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                      I am using the spool that came in the Dana in my car,,,,,,,,,,,,,,30 years ago:lol:
                      I am over 1000 hp now and did a gear change to take out the 5:13 gears.It was set up for the 1/8 th.
                       
                      Last edited: Feb 22, 2020
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