A-999 Swap and Information

Transmission and Drivetrain Tech

  1. fishy68

    fishy68 Tyr Fryr's Inc. FABO Gold Member

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    Yep. A 999 is physically identical to a 904.
     
  2. Sedanman

    Sedanman 67-9 Valiant specialist

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    Well,it turns out this trans needs a direct drum,rear drum & rear support. Does anyone have any of these parts? I don't mind having a lock up for a lil better mileage
     
  3. Sedanman

    Sedanman 67-9 Valiant specialist

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    my direct drum is dished & it's an 88 model year
     
  4. chubsgts

    chubsgts Well-Known Member

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    so what did the 999s come in so i can start trying to locate one

    thanks
     
  5. Sedanman

    Sedanman 67-9 Valiant specialist

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    late 70's to late 80's f bodies,vans & trucks. It looks like a 904 but has a blue wire going into the trans on the ds
     
  6. fishy68

    fishy68 Tyr Fryr's Inc. FABO Gold Member

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    Is that the only way to identify them? I ask because there is the 998 that looks like a 904 and some of them (but not all) have lockup and they all have the heavy duty components (4 pinion planetaries, 4 disc drums) like a 999 but they don't have the low first gear. Their in between a 904 and 999 if you will. I don't know how to tell them apart on the outside nor do I have any numbers for them to identify them, just when I get them apart I know how to verify the low first gear set.
     
  7. rmchrgr

    rmchrgr Skate And Destroy

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    Here are the non-lockup 999 PK#s which can be found on the driver's side pan rail:

    '74-'75 3681844
    '76-'77 4028465
    '78 4028878

    (PK#s starting with 44 and up are from the '80s.)

    The above units were found behind 360 powered passenger cars as a 'heavy duty' version of the 904. '78 was the first year they went to a lockup trans so if you have one of those units, you would want to look at the end of the input shaft to see if it has the machined tip on the end.

    Pretty much anything from 78-up was a lockup if it was in a passenger car, however, it's my understanding that some trucks and vans after '78 may have recieved a non lockup 998-999. Those are probably harder to find than the pass car ones. I mean how many 360 powered trucks or vans had a 904 in them?
     
  8. wireweld

    wireweld Well-Known Member

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    This is the #pk4058398 on a tranny that I have in the garage. I believe it is a lockup 999, is that correct?
     
    • Thanks! Thanks! x 1
    • rmchrgr

      rmchrgr Skate And Destroy

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      Could be, looks like an '81 model year unit.

      Once again, here is the MyMopar trans. Reference guide PDF link:

      http://www.mymopar.com/downloads/transguide.pdf

      Your trans is listed, towards the bottom when the list gets into the '80s. It says 8-318/A904 "Hvy Dty" next to the part #. They also clearly list a 999 for trucks in that year so yours may actaslly be a 998 variant with a 4 clutch drum. Not sure though, I'm not an expert.
       
    • Sedanman

      Sedanman 67-9 Valiant specialist

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      Sadly mine doesn't show up in that list & mine had the 5 clutches
       
    • rmchrgr

      rmchrgr Skate And Destroy

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      I wouldn't lose any sleep over it... 5 clutches are good no matter what the number on the pan rail says. 8)
       
    • fishy68

      fishy68 Tyr Fryr's Inc. FABO Gold Member

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      Agreed. I've found several trans that didn't show up on that list. 727's and 904's. It is a good list but somewhat incomplete.
       
    • UOP

      UOP Well-Known Member

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      I installed a Trans-go TF-2 kit in my A999 3 weeks ago.
       
    • Sedanman

      Sedanman 67-9 Valiant specialist

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      OK,now I just need to find a front/direct drum,rear drum & a rear support for mine. Anyone have it laying around?
       
    • fishy68

      fishy68 Tyr Fryr's Inc. FABO Gold Member

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      Try the link I provided earlier. www.wittrans.com They have it and it's probably cheaper than any you'll buy from anyone.
       
    • RustyRatRod

      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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      What kinda direct drum are you lookin for? I think I have a few.
       
    • dodge71demon

      dodge71demon Well-Known Member

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      I just got one of these trannies out of a 84 dodge.It came with a 318 that I wanted is the tranny worth any $$$$
       
    • Sedanman

      Sedanman 67-9 Valiant specialist

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      I need the dished 5 clutch direct/forward drum,rear/reverse drum (for lock up,tall spline) & rear support
       
    • Josecuda

      Josecuda Well-Known Member

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      With the Trans-go kit you had a mild or wild improvement over stock?
       
    • 19DART66

      19DART66 Well-Known Member

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      As far as I know 904 came behind 273 and /6, 998 were behind 318 in cars, 999 were behind 360 from 74 till it was replace by the A500 in A,B,C,F,M,J body cars and light trucks and vans. The 2.74 low gear set was used in 904,998,and 999 in 1978 through the late 80's to help cars get moving with 2.45 rear gears. There were two 999 sold through Mopar Perf. p4130400 with man v.b. and 2.45 first gear, p4529688 with 2.74 first gear. The 74&75 A999 part# pn3681844, 76&77 is pn4028465, 78 non lock up is pn4028878, 78&79 lock up pn4028815,4058111,4130515,4130645 I don't have any numbers after 1979. Hope this will help some of you in your search for trans and low gear sets.
       
    • Sedanman

      Sedanman 67-9 Valiant specialist

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      There are 2 81 Imperials and 1 85 diplomat in a yard near me. I'm debating robbing the trans's from them
       
    • rmchrgr

      rmchrgr Skate And Destroy

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      Most likely they are lockup if that matters. They probably have the low gear sets and either a 4 (998) or 5 clutch (999) front drum but... the lockup stuff does not work with non-LU units, the parts don't match. The drum and input shaft are very different and the sealing rings are in different places.

      Generally speaking, the only vehicles that had a 999 were 360 equipped. If either of those cars were 318, the units are probably 998s.

      Check the #s on the pan rails to be sure.
       
    • Sedanman

      Sedanman 67-9 Valiant specialist

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      They are 318's for sure.
       
    • DesertRat

      DesertRat FABO Gold Member FABO Gold Member

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      I went with a 999 transmission and the Transgo stage 1 shift kit. I wanted a lockup converter as my rear axle ratio is 3:73.1 and I wanted to pick up the rpm reduction I get with the lockup. If you put that converter in a pre-68 engine the converter nose is smaller. I had a custom converter built for mine, and I did install the GearVendors OD unit. My transmission builder was pleased as the 999 has a lower first gear than the 904 and is also stouter internally than the 67 904. I should know the results in June if there is any justice on the planet.
      DR---------------
       
    • Sedanman

      Sedanman 67-9 Valiant specialist

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      I did get my 999 built and installed but have yet been able to drive it. I did lay down some nice marks and got it sideways from just a pedal stomp in D though. It hasn't been together in 3 years so now I'm waiting on my body guy to work his magic which will take another 6 months.
       

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