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  • Transmission / Overdrive: T 10 Trans info needed

    Hoping someone can help with identifying my 4 speed so I can order the correct parts for a rebuild. I'm confused with the wide ratio vs close ratio subject. Reading on the forum, close ratio 1 st gear should be 2.20 and wide ratio 1 st gear should be 2.54. My cluster 1st gear count is 17 and 1st gear is 36. that work out to about 2.12 (close ratio?) The numbers on the case T-10-1B Q1 K.18.61 assuming this is a 61 gearbox? the input shaft is 10 spline & the output shaft is 16 spline. The total cluster gear counts are 17-20-23-and30. Before I put allot of effort into this I would like to know if its correct for my car. The rest of the driveline is a 289 and a 3:54 TT rear.
    Thanks for any help, Mark
    I believe this is the chevy bolt pattern. Looks like 1 ring on the input shaft But I have only 10 input shaft spline count unless I"m counting wrong. Just counting the high spots not the grooves or slots. My clutch disc fits.
    Attached Files
    Last edited by Mark Plucenik; 01-19-2021, 09:54 AM.

  • #2
    Check the input shaft for rings (grooves) the 2.20 close ratio has no rings. The 2.54 has one. Additionally, the number of teeth on the input shaft is 25 for the 2.54 and 27 for the 2.20.
    does the trans have the Chevy or Ford bolt pattern?

    I
    78 Avanti RQB 2792
    64 Avanti R1 R5408
    63 Avanti R1 R4551
    63 Avanti R1 R2281
    62 GT Hawk V15949
    56 GH 6032504
    56 GH 6032588
    55 Speedster 7160047
    55 Speedster 7165279

    Comment


    • #3
      FWIW, the cluster gear identifies this as a wide ratio 2.54 first gear trans.
      78 Avanti RQB 2792
      64 Avanti R1 R5408
      63 Avanti R1 R4551
      63 Avanti R1 R2281
      62 GT Hawk V15949
      56 GH 6032504
      56 GH 6032588
      55 Speedster 7160047
      55 Speedster 7165279

      Comment


      • #4
        I have this combo, 2.54 first gear and 3.54 R/A, in my 64 Avanti. Works pretty good. The only complaint is that 2nd is pretty close to 1st. Often, I will skip 2nd and go from 1st to 3rd.
        78 Avanti RQB 2792
        64 Avanti R1 R5408
        63 Avanti R1 R4551
        63 Avanti R1 R2281
        62 GT Hawk V15949
        56 GH 6032504
        56 GH 6032588
        55 Speedster 7160047
        55 Speedster 7165279

        Comment


        • #5
          64studeavanti is correct. If you have a groove in the input shaft it's a 2.54 to 1 first gear. Sometimes the groove is faint, like the one in the picture below.
          What is this transmission from? I've rebuilt, bought and sold alot of T-10's over the years if you need any help let me know.

          Regards,
          Joe

          Click image for larger version

Name:	T-10 Input shaft 001.jpg
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Size:	100.7 KB
ID:	1875819
          sigpic

          1962 Daytona
          1964 Cruiser
          And a few others

          Comment


          • #6
            Thanks for adding the pics. You have a 2.54 to 1 first gear start chevy bolt pattern T-10. Date code states it was built on Wed. Oct. 18th, 1961 during the first shift. It would have been originally installed in a 1962 GT Hawk. The gears don't look too bad, looks typical of most. Usually the problem will be with the brass synchronizers, with a hard shift into 2nd gear as the first tell-tale sign of problems. These are easy to rebuild for an experienced transmission guy. Just be aware of the type of gear oil you use or you can ruin the brass synchronizers. Also, a 10 spline input shaft was used on all the Studebaker T-10's.

            Regards,
            Joe
            Last edited by irish; 01-19-2021, 10:45 AM.
            sigpic

            1962 Daytona
            1964 Cruiser
            And a few others

            Comment


            • #7
              Thank you all for the lightning fast response. All the gears look great to me. There was some light metal flake in the sludge in the bottom , thinking normal ware. This is going to be a spare for my car, I just did not want to waist time & money on the wrong unit. So this would be classified as the wide ratio, right? If it were a drag strip car it would be better off the line? As for the gear oil I plan on using Amsoil full synthetic 90 wt. Maybe add a tube of BG .

              Comment


              • #8
                Add a Tube of BG, WHAT?

                It is not a Limited Slip Differential, it doesn't NEED Anything added.
                Many Stude. people including Racers prefer the Red Line Synthetic MT-90 Gear Oil for a smoother, faster Shift.

                https://www.redlineoil.com/mt-90-75w90-gl-4-gear-oil
                StudeRich
                Second Generation Stude Driver,
                Proud '54 Starliner Owner
                SDC Member Since 1967

                Comment


                • #9
                  Check the front bearing retainer. It should say T85C-6D for Studebaker.
                  78 Avanti RQB 2792
                  64 Avanti R1 R5408
                  63 Avanti R1 R4551
                  63 Avanti R1 R2281
                  62 GT Hawk V15949
                  56 GH 6032504
                  56 GH 6032588
                  55 Speedster 7160047
                  55 Speedster 7165279

                  Comment


                  • #10
                    I second the redline mt90.
                    78 Avanti RQB 2792
                    64 Avanti R1 R5408
                    63 Avanti R1 R4551
                    63 Avanti R1 R2281
                    62 GT Hawk V15949
                    56 GH 6032504
                    56 GH 6032588
                    55 Speedster 7160047
                    55 Speedster 7165279

                    Comment


                    • #11
                      I will get the Redline 90 , thanks, also , talking about the shifting. The factory shifter is OK at best. I have not really tried adjusting it but the through between gears is too long for me. do you guys have any recommendations for a better quality shifter , maybe a Hurst? Something that would bolt up and fit a GT Hawk without doing any cutting in the floor.
                      And just to confirm, this would be the wide ratio trans? Mark

                      Comment


                      • #12
                        Yes, wide ratio trans.
                        78 Avanti RQB 2792
                        64 Avanti R1 R5408
                        63 Avanti R1 R4551
                        63 Avanti R1 R2281
                        62 GT Hawk V15949
                        56 GH 6032504
                        56 GH 6032588
                        55 Speedster 7160047
                        55 Speedster 7165279

                        Comment


                        • #13
                          Most racers would want the close ratio to keep the rpm up between shifts. They would also use a lower (numerically higher) rear axle such as 4.09 or 4.55 etc, depending on engine, for a quick launch.
                          78 Avanti RQB 2792
                          64 Avanti R1 R5408
                          63 Avanti R1 R4551
                          63 Avanti R1 R2281
                          62 GT Hawk V15949
                          56 GH 6032504
                          56 GH 6032588
                          55 Speedster 7160047
                          55 Speedster 7165279

                          Comment


                          • #14
                            I have a Hurst shifter for the 64 Avanti. Lots of mods to make it work. I do not believe a bolt in is readily available unless you can find good used.
                            78 Avanti RQB 2792
                            64 Avanti R1 R5408
                            63 Avanti R1 R4551
                            63 Avanti R1 R2281
                            62 GT Hawk V15949
                            56 GH 6032504
                            56 GH 6032588
                            55 Speedster 7160047
                            55 Speedster 7165279

                            Comment


                            • #15
                              Mark
                              If you want your '64 to be correct the trans you pictured is incorrect. The shot of the case shows it's the wide pattern trans for a '61/2 V-8 application. The trans you want for your '64 GT has a pattern which is more square and uses the regular V-8 bellhousing for any stick or OD trans.
                              Rob in PA.

                              Comment

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