Talking TorqueFlites....

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  • Ron Ward
    Legendary BangShifter
    • Dec 2007
    • 5340
    #1

    Talking TorqueFlites....

    After reading a post by Shaun Callaway in the Swap Meet section, I started pondering TorqueFlites.

    How difficult would it be to build a bulletproof 904? It seems to me if you reduce the mass (as compared to a heavier 727) the engine has to turn, you are going to get more HP to the rear wheels, but just how durable is the little 904? What are the weak links and what can be done to fix them?

    Ron
    It's really no different than trying to glue them back on after she has her way.
    Tags: None
    • Matt Cramer
      Superhero BangShifter
      • Jan 2008
      • 2268
      #2
      Re: Talking TorqueFlites....

      How big a bullet are you looking at?

      I know they can stand up pretty well to naturally aspirated smallblocks and have been used with big blocks, but I don't have too many specifics other than that that many of the buildups apparently use the parts from the beefiest version, the A-999. I hope a transmission guru will chime in here as I'm planning at some point to beef up the A904s in both my Dart and my Ram 50.

        Comment

        • RacerRick
          Hero BangShifter
          • Nov 2007
          • 396
          #3
          Re: Talking TorqueFlites....

          They use 904 based transmissions in the Superstock Hemi classes. They only get a pass or two out of them at mid 8 second performance and 900+hp.

          Clutch and band area becomes an issue at high HP levels. There just isn't enough to hold massive power that hooks up. 500-600hp they will live however, if fully built.

          A rollerized 727 has about the same drag as a stock 904/999.

            Comment

            • Ron Ward
              Legendary BangShifter
              • Dec 2007
              • 5340
              #4
              Re: Talking TorqueFlites....

              The reason I ask about the 904 vs. the 727 is for overall size. It appears to me the 904 would fit better in a small transmission tunnel (i.e. 60-66 A-body Mopar) than the 727. I know the 727 we had in the Valiant was a press fit into the trans tunnel and I was looking for an alternative.

              The reason I went with a 727 last time is because it didn't cost me anything. We also got over a thousand trouble-free passes down the track with it with nothing more than a shift kit and filter change (it had 150K miles on it!). When it finally decided it had enough, it spit the seal on the front clutch. With no fluid pressure to engage the clutch, it smoked it!

              Do you feel a 904, if properly built, will handle 400-450 hp day in and day out???

              Thanks again,

              Ron
              It's really no different than trying to glue them back on after she has her way.

                Comment

                • IndyShiftman
                  Superhero BangShifter
                  • Dec 2007
                  • 1122
                  #5
                  Re: Talking TorqueFlites....

                  I don't know how much a 904 can handle but the size of the clutches and input shaft would have me concerned.
                  However, there used to be 904's put in smaller cars years ago that used a lower gear ratio gear set. I'm sorry I don't remember which cars but they were commonly called "baby 904's".
                  You can probably still find the gear sets around if you look.
                  I did have a customer that bought a few sets from me when I had them and he used them for drag racing.
                  If you need me to, I can try and find you a set.

                    Comment

                    • Matt Cramer
                      Superhero BangShifter
                      • Jan 2008
                      • 2268
                      #6
                      Re: Talking TorqueFlites....

                      Originally posted by NMCA_Ron
                      Do you feel a 904, if properly built, will handle 400-450 hp day in and day out???

                      Thanks again,

                      Ron
                      That doesn't sound like trouble - it's more along the lines of the big block cars or a twin turbo smallblock with W-2 heads that might worry me.

                      The "baby" 904 shows up in, among other things, my Ram 50. It only came behind Mitsubishi engines and so it has a Mitsu bolt pattern. However, the low gearset showed up in the full sized one behind V8s. I'm not sure it showed up in the baby version or how many parts interchange between the baby and grown-up 904. It's likely I might find out if I get serious with the Ram 50 though.

                        Comment

                        • IndyShiftman
                          Superhero BangShifter
                          • Dec 2007
                          • 1122
                          #7
                          Re: Talking TorqueFlites....

                          It's just the sun gear in the reaction shell and front planet. Need both pieces and that's it.
                          No difference in the rear planet, except I can't remember if they had fewer pinion gears. 3 instead of 4 possibly, but I think it was 4.

                            Comment

                            • Ross451
                              Drives An Automatic
                              • Nov 2007
                              • 35
                              #8
                              Re: Talking TorqueFlites....

                              Ron
                              They use 904 internals in 900 hp super stokers but they put them in 727 cases to fit the big blocks. Reason of course is weight but most if not all parts are after market which is quite pricey. Got that from Rick Ehrenberg.
                              Ross

                                Comment

                                • Ron Ward
                                  Legendary BangShifter
                                  • Dec 2007
                                  • 5340
                                  #9
                                  Re: Talking TorqueFlites....

                                  Originally posted by Ross451
                                  Ron
                                  They use 904 internals in 900 hp super stokers but they put them in 727 cases to fit the big blocks. Reason of course is weight but most if not all parts are after market which is quite pricey. Got that from Rick Ehrenberg.
                                  Ross
                                  I haven't heard much of anything from E-Booger lately. How's he doing?
                                  It's really no different than trying to glue them back on after she has her way.

                                    Comment

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