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  • Help with checking out part numbers

    Hi lads. Received bunch of rear suspension parts and started checking part numbers and they don't match (subframe and diff) what's on 7zap.com.

    Anyone can confirm that these will fit my 93' UrS4?

    First picture is for differential and 2 others for subframe.
    Attached Files
    '93 Audi 100 Avant - R.I.P
    '92 Audi UrS4 Avant - SOLD
    '93 Audi UrS4 Avant LPG

  • #2
    You are looking at casting numbers which have very little to do with the part number of the assembly which includes many parts only one of which is the casting.

    RS2'd 93 UrS4 5 spd sedan
    94 UrS4 V8 6 spd manual avant

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    • #3
      Those are the only part numbers I can see on them. Where are diff code/PN located?
      '93 Audi 100 Avant - R.I.P
      '92 Audi UrS4 Avant - SOLD
      '93 Audi UrS4 Avant LPG

      Comment


      • #4
        Originally posted by hunker7 View Post
        Those are the only part numbers I can see on them. Where are diff code/PN located?
        On the two V8 torsens that I have in my garage there is a painted stamp on the diff housing.
        RS2'd 93 UrS4 5 spd sedan
        94 UrS4 V8 6 spd manual avant

        Comment


        • #5
          Checked all over it no stamps of any sort. It definitely looks like the correct one visually.
          '93 Audi 100 Avant - R.I.P
          '92 Audi UrS4 Avant - SOLD
          '93 Audi UrS4 Avant LPG

          Comment


          • #6
            Originally posted by hunker7 View Post
            Checked all over it no stamps of any sort. It definitely looks like the correct one visually.
            Make sure that it is a 4.11 to 1 rear diff by counting the number of times the input flange turns when you turn one of the out put flanges.

            Does it have the diff locker mechanism?

            RS2'd 93 UrS4 5 spd sedan
            94 UrS4 V8 6 spd manual avant

            Comment


            • #7
              If I turn one of the output shafts 2 times input shaft turns 1 time.

              It is a locking diff yeah, comes with the little vacuum actuator.

              EDIT: when I lock the diff it is about 4 turns on input shaft for 1 turn on output shaft.
              Last edited by hunker7; 19th May 2017, 16:00.
              '93 Audi 100 Avant - R.I.P
              '92 Audi UrS4 Avant - SOLD
              '93 Audi UrS4 Avant LPG

              Comment


              • #8
                3.89 or 4.11? Need to be accurate

                Sent from my LG-H955 using Tapatalk

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                • #9
                  Originally posted by diesel des View Post
                  3.89 or 4.11? Need to be accurate

                  Sent from my LG-H955 using Tapatalk
                  I'll mark it up again tomorrow and do it again but I'm pretty sure it was 4.11. What car did 3.89 diff come on?
                  '93 Audi 100 Avant - R.I.P
                  '92 Audi UrS4 Avant - SOLD
                  '93 Audi UrS4 Avant LPG

                  Comment


                  • #10
                    Lots of audi ran the 3.89. Maybe turn it 10 times and count the other shaft does 41.1 or 38.9 times.

                    Sent from my LG-H955 using Tapatalk

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                    • #11
                      Originally posted by diesel des View Post
                      Lots of audi ran the 3.89. Maybe turn it 10 times and count the other shaft does 41.1 or 38.9 times.

                      Sent from my LG-H955 using Tapatalk
                      That's a good idea actually I'll spin it 10 times. What happens if I use 3.89 instead of 4.11?
                      '93 Audi 100 Avant - R.I.P
                      '92 Audi UrS4 Avant - SOLD
                      '93 Audi UrS4 Avant LPG

                      Comment


                      • #12
                        Originally posted by hunker7 View Post
                        What happens if I use 3.89 instead of 4.11?
                        RS2'd 93 UrS4 5 spd sedan
                        94 UrS4 V8 6 spd manual avant

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                        • #13
                          lol - well said
                          //-\\ ((_)) //)) //

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                          • #14
                            Your center diff won't be happy and will be damaged over some miles.

                            Sent from my LG-H955 using Tapatalk

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                            • #15


                              I checked again and after 4 turns I have to turn input shaft a bit more to align marks on the output shaft so it is a 4.11:1
                              '93 Audi 100 Avant - R.I.P
                              '92 Audi UrS4 Avant - SOLD
                              '93 Audi UrS4 Avant LPG

                              Comment

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