Well I'm phukd. Th400 lost 3rd

Discussion in 'Tech Discussion' started by da_raabi, Nov 13, 2017.

  1. da_raabi

    da_raabi Trailer Park Supervisor

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    Well at least now it looks pretty! Also go my first component rebuild done.

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  2. SlickGTP

    SlickGTP Full Access Member

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    Good start! I'm probably not too terribly far behind you on a transmission rebuild.
     
  3. da_raabi

    da_raabi Trailer Park Supervisor

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    Well I'm kind of on hold right now. I can't really do much else until the rebuild kit arrives. I ordered it about a week ago, and from what I can tell it has yet to ship. I'm starting to get a tad frustrated because I was hoping to work on it over the t-day break...
     
  4. MikeB

    MikeB Full Access Member

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    Way to go, man! Things don't look too bad from what the pictures show. At least the fluid isn't burnt toast brown.:eek:
     
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  5. da_raabi

    da_raabi Trailer Park Supervisor

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    Well the kit finally arrived yesterday, 15 days later... I was able to get the geartrain rebuilt, but discovered a slight issue with the new front band...

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    Oh, and I found my first blown seal in the center support. I'm thinking this might have contributed to my problems?

    pic2.jpg
     
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  6. da_raabi

    da_raabi Trailer Park Supervisor

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    Anybody ever use the wider 4l80e front band? Since the one that came with the kit is garbage I'm thinking about upgrading. I know it needs a longer servo pin, is that all?
     
  7. Jrgunn5150

    Jrgunn5150 Questionable methods

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    The front band from 99-up does not interchange to my knowledge.
     
  8. da_raabi

    da_raabi Trailer Park Supervisor

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    OMG WTF??? So I ordered this kit from a site somebody here mentioned, it took 2 weeks to get here - and I had to threaten to cancel the order to get it, the front band came broke, and now I discover it is also missing the intermediate clutch frictions!!!!! What kind of monkey operation is this??? I could have had this done over a week ago!!!

    /Rant

    On the plus side I did successfully get the geartrain installed in the case. Although it would have been nice if the kit came with new selective thrust washers. I had to reuse the old one at the output that had kind of boogery ears... Nice
     
  9. 74 Shortbed

    74 Shortbed Full Access Member

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    Should have replaced that thrust washer with a TH350 pump bearing.
     
  10. da_raabi

    da_raabi Trailer Park Supervisor

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    Has anybody ever increased the number of springs in the intermediate apply piston? Stock, mine had 3 retained with a plastic retainer, but it looks like it could hold 6 or even 9. What effect would this have?

    The B&M transkit (which I'm not using, just referencing) recommends the upgrade. I just cannot find any information on what effect it would have.
     
  11. crazy4offroad

    crazy4offroad Service Bullshit Filter Soon

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  12. da_raabi

    da_raabi Trailer Park Supervisor

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    Well both drums are rebuilt and sitting in bags. Valve body is rebuilt and in a bag. Pump is rebuilt and in a bag. I'm soaking a few of the elements-exposed parts so they will be nice and clean.

    I chose not to go with the shift kit's manual low override mod. I know it can be handy in extreme situations, I just don't want to accidentally slide into first at 45mph and blow the engine sky-high. I figure if I need it I can always do it later.

    Also went with a slightly more aggressive 1-2 shift setup. I used the orange/red spring combo. I don't want to be chirping the tires every shift. In a dually that's probably not good!

    I'm going to do the separator plate mod this evening. I'm using the TransGo plate, and plan to drill:

    2nd Feed: .093 or maybe a bit more. This is Range 2 for trucks

    3rd Feed: Stock, again Range 2

    3rd Accm: Stock, again Range 2

    I'll post a few pictures tomorrow of some additional carnage I discovered. Broke accumulator piston, wiped frictions. All kinds of happy noise. I guess 150,000 miles will do that huh?

    Waiting on a call back on the clutch frictions. I imagine he's not going to be happy to come in on a Monday morning to THAT voicemail...
     
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  13. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Get an aluminum piston not another pos plastic one.
     
  14. da_raabi

    da_raabi Trailer Park Supervisor

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    Already did it. That was one of the issues I found. The OE plastic one had broke a nice ring right off on the shaft. Pretty sure it was doing a whole lot of nothing!

    Found a wiped out clutch in the forward drum too. Literally bare metal.

    Found 2 broken seals and a whole ton of brittle/stiff ones throughout.

    Bunch of gunk in the v/b valves too.

    I'm 99% sure this project is going to give me cancer...
     
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  15. HotRodPC

    HotRodPC Administrator Staff Member

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    Them 2 broken seals if you're talking about sealing rings are probably what toasted this transmission. Once you get a fluid bleed somewhere then things start to happen like dominoes falling. This happens, then that happens, causing this to happen and so forth.
     

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