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Advance Adapters D18 3.15 Kit?

Discussion in 'Early CJ5 and CJ6 Tech' started by garage gnome, Jul 11, 2021.

  1. Jul 11, 2021
    garage gnome

    garage gnome ECJ5 welder

    Western MA
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  2. Jul 11, 2021
    wheelie

    wheelie beeg dummy 2024 Sponsor 2023 Sponsor

    York, PA
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    I know nothing about it, Nate but, recently there was discussion here that no one still makes a low gear set for the 18 so, if Summit still has some, they are likely left over stock.
     
  3. Jul 11, 2021
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    Interesting that it is listed as AA kit - the original kit (that has been discussed as no longer available) was from Tera.
     
  4. Jul 11, 2021
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Summit drop ships alot of stuff from manufacturer. I wouldn't be surprised if you ordered it then it came up unavailable.
     
  5. Jul 11, 2021
    duffer

    duffer Rodent Power

    Bozeman, MT
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    As far as I know, the TeraLow kits are dead. Herm is apparently getting them reproduced but he indicated it would be sometime this fall before they are available. I really need a 6 spline bull gear to replace my overdrive when I disintegrate it.
     
    Steve Ryan and Jrobz23 like this.
  6. Jul 11, 2021
    mortten

    mortten I can’t put my finger on it 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Not in stock in any of their warehouses. That means drop ship.
     
  7. Jul 11, 2021
    garage gnome

    garage gnome ECJ5 welder

    Western MA
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    I may try it and see what happens. I would prefer Herms kit though.
     
  8. Jul 11, 2021
    oldtime

    oldtime oldtime

    St. Charles,...
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    I ordered a 3 gear set from Herm last week.
    Just have to wait and see if he has any left ……
     
  9. Jul 12, 2021
    Mr Vaughan

    Mr Vaughan

    Question: does the 3 gear kit use the original bull gear?
     
  10. Jul 12, 2021
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    No....a different bull gear is needed (smaller diameter/less teeth)
     
  11. Jul 17, 2021
    oldtime

    oldtime oldtime

    St. Charles,...
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    You must have a 4 gear set to operate the D18 and a 5 gear set is required to operate a D20.
    The 3 gear set is used for D18 applications along with a special overdrive bowl gear.
    I got my three gear set today and yes I already had an extra Tera low bowl gear laying about.
    So yes Herm alone is still selling the gears at least for now…..
     
  12. Jul 19, 2021
    Keys5a

    Keys5a Sponsor

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    It looks like the Summit link shows a ship date of August 16, so maybe someone (AA, Tera?) is running a small batch to meet our limited demand?
    -Donny
     
  13. Jul 19, 2021
    Montgomery J Yarbrough

    Montgomery J Yarbrough Member

    Lander wyoming
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    I was interested in the the Dana 18 tera low gear set but opted for the sm465 trans instead had to rebuild trans due to new main shaft install. And a new bell housing and resized my drive shafts but couldn't be happier
     
    mikiep likes this.
  14. Jul 19, 2021
    Mr Vaughan

    Mr Vaughan

    if you do both, you can get a killer crawl ratio.
     
  15. Jul 19, 2021
    Montgomery J Yarbrough

    Montgomery J Yarbrough Member

    Lander wyoming
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    My combination is almost to slow some times 4.88 gears sm465 and Dana 18 thats like an 80:1 crawl ratio but i don't like heights and some trails i go on are cliff hangers and rocky helps butloads
     
  16. Jul 20, 2021
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

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  17. Jul 24, 2021
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    That is a very informative site, but Bill is very misleading. For a non street legal buggy with huge tires it’s correct.
    A CJ on 33’s with a crawl ratio in the 60’s to 70’s can go anywhere that the jeeps ground clearance and short wheelbase allows for.
    We just took 8 jeeps across the rubicon with crawl ratios from the 40’s to 70’s without issue.
    Traction and ground clearance are probably more important as crawl. Tire size plays a huge part of crawl ratio. Bigger tires require way more crawl ratio then our average 33” tires.
    We are rebuilding Steve’s Jeep this winter:
    SM 420
    2.46 low D20
    3.73 gears with lockers
    At 64:1 crawl he will be running circles around the rubicon.
     
  18. Jul 24, 2021
    duffer

    duffer Rodent Power

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    Yep, crawl ratio in and of itself, is just another worthless number without any meaning in the real world. One has to consider the whole package and the intended use. Personally, I'll never own a Jeep that can not be driven on the highway at typical speeds and one that can handle all the off road I want to do (which is similar to the Rubicon). Having to be competent in both aspects does add a few engineering challenges.
     
  19. Jul 24, 2021
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Crawl ratio goes out the window with juice tranny. Next project is th350/d300 and 3:73
     
  20. Jul 24, 2021
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    In the article "the actual number of useable gears I have at my disposable, even with dual transfer cases, is actually pathetically low. Out of a possible number of combinations totalling 16, I really only have 7 gears"

    And yes this is a sm465 with a np203 doubler then a Teralow d20 so his crawl is absurd before the 3.15 gears.
     
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