Drag Pak Challenger TH400

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  1. 66Satellite47

    66Satellite47 FBBO Gold Member FBBO Gold Member

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    Does any know why the TH400 is the superior choice? What are the advantages?
     
  2. Budnicks

    Budnicks You Can Just Thank Me Later FBBO Gold Member

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    I can't say 100% as to their exact reasoning
    BUT;
    IMO much better/stronger aftermarket cases available
    they don't have to make or tool up for MoPar to source/produce them
    (extremely costly to tool up & big $$'s in engineering, to produce something in small quantities,
    for the limited MoPar markets
    )
    cases especially that can handle the 1500+hp
    much more readily available parts,
    different low gear clusters/planetary gears etc.
    better parts, stronger inputs & output shafts, drums, bands, friction materials etc.
    Edited; also a sprag/overrunning clutch, that won't grenade as easily
    & in far more quantity
    & a much more affordable priced parts
    (there's far more Aftermarket GM based stuff, made across the spectrum for racing, Than MoPar)
    I'm sure budget/cost/bottom lines, has something to do with it too

    you'd think MoPar SRT etc. that they'd make a better case for the TF 727
    market & sell them too, win win, but it seems they don't/won't

    such is life in the MoPar world
    when it costs another $5,000 on a $100,000 car that's 5% lost profit
    or it'd be added to the other end
    to an already rare/select few in the market place to begin with
    that buy these types of Factory &/or even these types/styles of racecars

    it comes down to $$$'s & good Sense (not cents) IMO
     
    Last edited: Mar 13, 2020
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    • Jerry Hall

      Jerry Hall FBBO Gold Member FBBO Gold Member

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      I have never worked on a TH400 or a 440/6 or Hemi automatic. I helped a friend in 69-70 with his 6 pack Superbee automatic. There was also a 70 LS6 Chevelle in the same shop. The things I saw every few weeks were transmission work on the Superbee and valve train/motor work on the Chevelle. Both cars were equally fast when working. I saw the Chevelle beat the Bee due to transmission failure on more than one occasion. On the other side the, I saw the Bee win over the Chevelle on several occasions due to engine/valve train failure. When both could compete a pass the winner was usually driver related.
       
    • kramer

      kramer Well-Known Member

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      As far as shift qualities without much effort the TH400 is tough to beat, you can make the 727 shift pretty well but sometimes for the inexperienced it might take some time to get the right combo of parts to achieve that. Otherwise the 727 is a pretty solid transmission that can take alot of abuse.
       
    • 33 IMP

      33 IMP Well-Known Member

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      I would be nervous with my feet next to a 727 with 1000hp in front of it.
      There are Rossler th400s out there, converted to two speeds, behind 3500+ hp. The guys running three's in the eighth with twin turbo hemis all use th400s or glides.
       
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      • 66Satellite47

        66Satellite47 FBBO Gold Member FBBO Gold Member

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        Budnicks, sure understand your point why Mopar would use the available aftermarket TH400, since an SFI case is there. GM aftermarket always does have that numerical advantage for sales. Seems like there would be a fair demand for an SFI capable 727 case. And seems like all the aftermarket 727 parts have the strength required to handle well over 1000 HP.
         
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        • 66Satellite47

          66Satellite47 FBBO Gold Member FBBO Gold Member

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          Parts combinations for 727 are well known by those that do 727's. Key is not using the wrong 727 for the wrong application. I suspect same for TH400. Don't think they're all the same either.
           
        • 66Satellite47

          66Satellite47 FBBO Gold Member FBBO Gold Member

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          I have a fair amount of 727 experience. One thing I was really stuck by when helping my Chev racing buddy on his TH400, was how many more parts there were & what seemed like a lot of complexity compared to a 727. Parts looked to be as beefy/HD as a 727, just more to set up. Also worked on his Glides with him, amazingly simple but small parts.
           
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          • Darter6

            Darter6 FBBO Gold Member FBBO Gold Member

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            I'm almost sure I'm wrong, but I kinda remember that a Turbo 400 doesn't have bands ? Like I said I may be wrong.
             
          • Demonic

            Demonic Well-Known Member

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            You would think. A question for A&A trans or someone similar. My guess is there isn't enough demand.
             
          • theman440

            theman440 Well-Known Member

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            GM never used the TH400 behind their diesel pickups - Chrysler did . . . nuff said!
             
          • 66Satellite47

            66Satellite47 FBBO Gold Member FBBO Gold Member

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            Chrysler used a TH400 in their diesels?
             
          • theman440

            theman440 Well-Known Member

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            Clarification - GM did not, in their modern stuff anyway.
             
          • BB BELLA

            BB BELLA Well-Known Member

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            pretty sure the 400 was used behind the 6.2 diesel, cucv pickup and early hummer until 4l80 and 6.5 became available!
             
          • dvw

            dvw Well-Known Member

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            I've seen the TH 400s used in the Drag Pac cars, (Ford, GM, Dodge). They are very trick with very few stock parts. The non supercharged cars are still using 904 based stuff.
            Doug
             
          • 66Satellite47

            66Satellite47 FBBO Gold Member FBBO Gold Member

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            The 904 will work great with enough aftermarket parts. Still not equal to a 727 with the same level of aftermarket parts. Just less rotating mass.
             
          • dvw

            dvw Well-Known Member

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            The 904 stuff lives fine. Buddy runs 2 cars with them. New style Challengers, one stock eliminator (9.30 ), one in S/S (9.00). Both are close to 3400lbs.
            Doug ramchargers.png motown missle.jpg
             
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            • 66Satellite47

              66Satellite47 FBBO Gold Member FBBO Gold Member

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              Great, you made my point. If you have the correct parts they do the job.
               
            • vintage chromoly

              vintage chromoly Well-Known Member

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              The one I looked at had a Ford 9” rear axle as well.
              Of course, it was all aftermarket, but 9” architecture, no less.
               
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