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  1. Godfather90

    Builds 1976 FJ40 Crawler Build

    Looks awesome! Does it have pins to keep it concentric? Good idea making a jig to keep it aligned when machining! You ended up running that bearing? Where there's a will there's a way! Ill have to measure my stuff when I get back. will be interesting to see how they compare! Mike
  2. Godfather90

    Builds Meet Ivy, 1976 FJ40 w/VW TDI

    How did they do in the snow? Looks like fun! Mike
  3. Godfather90

    Builds 1976 FJ40 Crawler Build

    I'm not really sure. I probably wouldn't run it. It's just another bearing to spin that will never be loaded up. Wyell just have to see how it all fits together. Does the machinist have everything he needs to check the concentricity? I'm would put a lot of emphasis on this. It will kind of...
  4. Godfather90

    Builds 1976 FJ40 Crawler Build

    That makes sense. That is because the transmission output shaft typically supports the input gear of the transfer case. When you have that adapter shaft you have to support it on both ends. The RF1A has it's own bearings on both sides of the input so this bearing becomes unnecessary. Does that...
  5. Godfather90

    Builds 1976 FJ40 Crawler Build

    Is the bearing on the AA tail housing side or in the marlin ToyBox adapter side?
  6. Godfather90

    Builds 1976 FJ40 Crawler Build

    The most important part right now is the concentricity. How is the fit on the output shaft? And the input of the ToyBox? A weep hole will help keep the spline wear down. Mike
  7. Godfather90

    Builds 1976 FJ40 Crawler Build

    Maybe you should trim that shaft yourself? Just use an angle grinder... You can use clay to make sure you get it nice and tight. Have you looked for a seal that will fit where that bearing rode? Or are you really going to try to run that bearing in there? Engine sounds good! Awesome...
  8. Godfather90

    Builds 1976 FJ40 Crawler Build

    I don't remember any dimensions off hand. I have had no issues with the length of what I have at all. No vibrations or binding or whatever. It's an R151f/ax15 hybrid kinda deal Mike
  9. Godfather90

    Builds 1976 FJ40 Crawler Build

    I won't be at the truck for a few weeks. Its pretty long though. Wouldn't be surprised if it's longer than yours. Mike
  10. Godfather90

    Builds 1976 FJ40 Crawler Build

    The RF1a doesn't generate much heat in high range. I would worry too much.
  11. Godfather90

    Builds 1976 FJ40 Crawler Build

    Yea I'm not sure about mixing the two. I know that my toy box likes a hair under one qt of fluid before it starts to weep out of the shifter. I have more case volume than a typical ToyBox because of the tail housing it mates to. There are a bunch of potential issues with this. The level might...
  12. Godfather90

    Builds 1976 FJ40 Crawler Build

    Right here at the base of the splines.
  13. Godfather90

    Builds 1976 FJ40 Crawler Build

    So a few things I'm unsure of... The RF1A case has a bearing on both sides of the gear set, and the output shaft of the 4500 does not require a support so I don't think you will be needing that bearing in the adapter between the two. However there will need to be a seal between the two boxes...
  14. Godfather90

    Builds 1976 FJ40 Crawler Build

    This is an interesting prospect. I don't know if you would need to heat treat the aluminum for this. I would farm that job out to someone who can weld this properly. I would imagine that AA makes only a few patterns of 4500 tail housings. Maybe you can get one that is not machined on the...
  15. Godfather90

    Builds 1976 FJ40 Crawler Build

    No leftovers or partial kits sitting around? Bummer.
  16. Godfather90

    Builds 1976 FJ40 Crawler Build

    You can always run that 4 speed for a few years. I would still call AA and see why they pulled the rf1a adapter and try to grab one of they have it. The most important part of the ToyBox is the output and the transfer case side adapter plate anyways. You can probably sell that left over...
  17. Godfather90

    Builds 1976 FJ40 Crawler Build

    Just to clarify: So if this above makes sense you can see that the input shaft is part of the input gear, but the output shaft is actually separate from the low range drive gear that rides on it. The input is available in both 21 and 23spline in both 2.3 and 4.7 flavors new off the shelf...
  18. Godfather90

    Builds 1976 FJ40 Crawler Build

    If you buy a marlin 4.7 gear set it comes with everything you would need. They have a 23 spline male input. The output shaft is not part of the gear set. This is basically what I did. Mike
  19. Godfather90

    Builds 1976 FJ40 Crawler Build

    Maybe call aa and see if they have any rf1a nv4500 adapters in stock that aren't listed anymore. That's exactly what you need. Mike
  20. Godfather90

    Builds 1976 FJ40 Crawler Build

    I didn't know they made the whole output shaft. I thought it was just a spud shaft adapter. Mike
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