Low Band Apply Question

Transmission and Drivetrain Tech

  1. Divenut

    Divenut Well-Known Member

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    Hey Folks,

    I was wondering if a manual valve body (727) without low-band apply can be modified to apply low band? Just curious as I am kicking around some options for winter projects.

    Thanks in advance to the resident FABO Torqueflite gurus!

    Pat
     
  2. Jadaharabi

    Jadaharabi FABO Gold Member FABO Gold Member

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    John Cope of CRT used to do the mods to the valve bodys before he started custom making his own.
     
  3. 3forty

    3forty "Raw Power"

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    I emailed John Cope many years ago about your exact same question. He replied back and said ....no.
     
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    • Jadaharabi

      Jadaharabi FABO Gold Member FABO Gold Member

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      .
      I did to and he said no that he no longer did that.
      But it can be done. I have a turbo action vb that I would like modified.
       
    • oldkimmer

      oldkimmer FABO Gold Member FABO Gold Member

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      Check with A&A. That’s Rick Allison. Kim
       
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      • Rob Eppler

        Rob Eppler My Dart Charger...home made!

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        Low band apply in this trans! This is my Dart...luck to have it in his catalog! LOL

        18B139C5-83B6-45BD-9AD3-BF306931B8A3.JPG

        56251847333__7F0ACDE4-4A58-4FCB-9397-19C54D37EF1C.JPG
         
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        • Jadaharabi

          Jadaharabi FABO Gold Member FABO Gold Member

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          • RustyRatRod

            RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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            You don't even NEED low band apply as long as you do your burnout spinning into third gear.
             
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            • Jadaharabi

              Jadaharabi FABO Gold Member FABO Gold Member

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              .
              I thought without low band apply you could rip the rear sprag out doing low gear burn outs.
               
            • RustyRatRod

              RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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              You can if it hooks up while it's still in 2nd gear. The shock of it hooking in 2nd is what does it. If it's still spinnin goin into 3rd, it ain't gonna happen.
               
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              • oldkimmer

                oldkimmer FABO Gold Member FABO Gold Member

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                It’s actually not the shock of grabbing traction in 2nd, but when it shifts back to 1st and it grabs traction. Kim
                 
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                • famous bob

                  famous bob mopar misfit

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                  I1m no trans expert, but had a violent trans explosion back in the day, I wont have one w/o it now----JMO
                   
                • turbodart68

                  turbodart68 Well-Known Member

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                  I have been racing torqueflites for 30 years and I had lots of trans problems early on. I eventually went to Protrans and had them do the rebuild. They gave me instructions on how to make it live. NEVER do a burnout in low or second. Don't even start there. Of course if its a stock 330 hp car you really don't have to worry about it but even then you should have a shift kit installed that lets you have total manual control. That way you can start and end your burnout in high gear.
                   
                • Rob Eppler

                  Rob Eppler My Dart Charger...home made!

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                  Thank you for the compliment on my 65. I have owned this car since 1969. Always running a 999 [904] and never have had issues with the trans [burn out] procedure/failure. I have been racing this car since the 80's. Always a small block...now just a little bigger small block! 433". As you can see, 9.53 dial, yes it covers this number all the time. Single carb no power adders.
                  Burn outs...never 1st gear! I sometimes use 2nd gear and shift immediately into 3rd. After the burnout, I make sure I stop, shift into first and move forward. Pre-stage, [no neutral at that time] then stage when my opponent is present and ready!! Trans brake button on, Enjoy the ride upon button release!

                  IMG_0937 (1).JPG
                   
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                  • FlDart360

                    FlDart360 Well-Known Member

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                    Just to be clear because i'm reading this thread to learn something here that i never had any knowledge of before. Burnouts in a 9 second car don't start in first gear? my street car is under 400HP should i not start in first gear when i'm playing around doing burnouts. I know i'm not playing in the same ballpark as the cars in this post, but at what point do you need to be concerned about breaking something?
                     
                  • oldkimmer

                    oldkimmer FABO Gold Member FABO Gold Member

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                    If ur tranny is fully automatic, do ur burnout in 1st gear (manual low) and leave it in 1st, do not shift out of first till ur done ur burnout. Starting in 2nd came along when the reverse manual valve bodies came out as they never had low band apply. Kim
                     
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                    • Jadaharabi

                      Jadaharabi FABO Gold Member FABO Gold Member

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                      To further explain the 1st gear manual low is used because your trans is using the band apply. In drive, low gear does not use the band apply.
                       
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                      • turbodart68

                        turbodart68 Well-Known Member

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                        Everyone should care about their 727 blowing up. The burnouts in question are when you hold still in the burnout box and do a burnout especially with a line lock. It allows the wheel speed to exceed engine speed and the overrunning clutch is what picks up a major amount of RPM and the trans goes boom. When screwing around on the street there is load on the tires and its harder to wreck the over running clutch. When you rebuild your torqueflite always use a shift kit with total manual control. A 400 hp motor should be able to annihilate the tires at will on the street. So yes if possible high gear is the gear of choice for burnouts. A&A and Protrans (Protrans makes A&As parts) make a solution for the overrunning clutch assembly.
                         
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                        • turbodart68

                          turbodart68 Well-Known Member

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                          And the 904/998/999 don't have this problem. If you have a 400hp small block then you should try a 904, they rob a lot less power.
                           
                        • famous bob

                          famous bob mopar misfit

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                          Cant a guy start his burn out in drive w/ a full auto, it will shift to 2 and than 3rd by it self in the water, than roll out of the water in 3rd drying the tires off. Never hooking up /letting off while still spinning ?????? I have only made two runs at the strip and mine didn`t even try to hook up coming out of the burn out, "or anywhere else for that matter."
                           
                        • oldkimmer

                          oldkimmer FABO Gold Member FABO Gold Member

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                          Not a good idea. If ur tires don’t need much heat just start in manual low and leave it there. Kim
                           
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                          • 67Dart273

                            67Dart273 Well-Known Member

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                            !!!THANKS!!!! This finally clears up some confusion
                             
                          • turbodart68

                            turbodart68 Well-Known Member

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                            Yes, you can do that but you run the risk of the tires going fast than the crank speed and thats what breaks them. If I had a fully auto car that didn't have manual operation I would do my burnouts dry.
                             
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                            • turbodart68

                              turbodart68 Well-Known Member

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                              This is bad info. If you have a 727 with a stock over running clutch assembly it will go boom one day.
                               
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                              • oldkimmer

                                oldkimmer FABO Gold Member FABO Gold Member

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                                Please explain how u would do your burn out with a factory stock valve body and why. Kim
                                 
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