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trans swap in a 68 cj5....

Discussion in 'Early CJ5 and CJ6 Tech' started by muley68, Jul 27, 2010.

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  1. Jul 27, 2010
    muley68

    muley68 New Member

    midwest
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    1968 cj5 225 v6 stock 3spd dana 20 t-case....iam looking into a trans swap and wondering if its possiable to swap in an AX15 5spd...i have looked into t-18 and np435 swaps but iam not goin to be rock crawling anytime soon so the granny 1st is useless to me...as well i might possiably look into a m-21 muncie swap. but iam really apt to find out if an AX15 will swap in... if anyone could give me some info on a good tranny to swap in that wont brake the bank getting the adapters or has any good ideas that would be great! primarialy the jeep will be a part time driver and backroad mudder....thanks in advance for any and all info!!
     
    muley68, Jul 27, 2010
    #1
  2. Jul 27, 2010
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    sparky, Jul 27, 2010
    #2
  3. Jul 27, 2010
    muley68

    muley68 New Member

    midwest
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    how about adapting the dana20 to the ax15? how does the overdrive unit work? does it use my stock trans?...thakns bud!!
     
    muley68, Jul 27, 2010
    #3
  4. Jul 27, 2010
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Dana 18/Dana 20 both would require adapters as well as the engine. I forgot about those.

    Anyway, I'd just get a Warn/Saturn Overdrive unit and use that. Cheaper, easier, that's how it's been done for years, and less headache in the end.

    Just bolts onto the stock transfer case.

    See http://www.hermtheoverdriveguy.com/ for more.

    Novak's site has some good info on them too as I recall.
     
    sparky, Jul 27, 2010
    #4
  5. Jul 27, 2010
    muley68

    muley68 New Member

    midwest
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    awesome!!...thanks again ill give'em a look
     
    muley68, Jul 27, 2010
    #5
  6. Jul 27, 2010
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Seeing that you have 3.73 gears, what are you trying to gain with a transmission swap?

    When you said AX15, I (incorrectly) assumed you needed an overdrive unit, I should've asked, my apologies.
     
    sparky, Jul 27, 2010
    #6
  7. Jul 27, 2010
    muley68

    muley68 New Member

    midwest
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    more gears to obtain highway speeds some day without redlineing the v6 and lookin into a fully snychro tranny as well iam open to all options and sugestions just the first bright idea i had was the ax15 cuz i had a comanche pickup with the 6cyl and ax15 5spd and that trany was pretty tough and the overdrive was handy
     
    muley68, Jul 27, 2010
    #7
  8. Jul 27, 2010
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    3.73 gears aren't going to be anywhere near the redline of your V6. Those are highway cruising gears.

    You'll be fine with them.
     
    sparky, Jul 27, 2010
    #8
  9. Jul 27, 2010
    muley68

    muley68 New Member

    midwest
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    i guess i never really thought of it like that hell my superduty has 3:73's in it...ok so if i have a readily avaliable t-18 or np435 that would be a good swap and have a granny gear incase i want to crawl up the side of a barn or something fun like that
     
    muley68, Jul 27, 2010
    #9
  10. Jul 27, 2010
    windyhill

    windyhill Sponsor

    PA
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    stock '67 with :v6: 3:73 and 3 speed will go fast enough to let the front end get light!:shock: off the speedo if your young and stupid enough:D
     
    windyhill, Jul 27, 2010
    #10
  11. Jul 27, 2010
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
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    :evil:
     
    Patrick, Jul 27, 2010
    #11
  12. Jul 27, 2010
    SIDSCJ

    SIDSCJ Jeep addict

    14th State
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    Izzat yer guilty face:D:D
     
    SIDSCJ, Jul 27, 2010
    #12
  13. Jul 28, 2010
    mortten

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

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    The T-14 is fully synchroed.
     
    mortten, Jul 28, 2010
    #13
  14. Jul 28, 2010
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
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    I think terrain and road condition have much to do with perceptions of 90 mph as stupid or not.

    Given a long, straight, flat, smooth road where I could see for miles in all directions and no traffic, I would not have hesitated to run the '71 up to 90 mph... and would not have thought it stupid. However, I can't visualize a place here in PA in which 90 in the CJ is not stupid (I only did it once ;) ). Limited visibility in every direction, suicidal critters darting out of the woods onto the road, too much traffic, no straight stretch more than 1/4 mile, and some of the worst roads in the nation... :rofl:

    BTW, the '71 with 3.73 and 33s would be nowhere near redline at 90 mph... was only turning about 2300 at 65...
     
    lynn, Jul 28, 2010
    #14
  15. Jul 28, 2010
    unclebill

    unclebill Banned

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    uncamonkey and i went 80 for just a minute or two while he was here.
    he was showing me the difference between the dauntless and the hurricane.
     
    unclebill, Jul 28, 2010
    #15
  16. Jul 28, 2010
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    Your main problem in a CJ going 90 will be if you need to make an evasive maneuver. In that case, a lot will depend on the capability of the driver, and whether they make the right choices within the capability of the vehicle. But straight ahead on a clear highway, in a CJ in proper repair, I would expect it to be ok. Certainly I've driven my intermediate Jeeps (nearly) that fast, with no trouble.
     
    timgr, Jul 28, 2010
    #16
  17. Jul 28, 2010
    Rralphs

    Rralphs Old Member

    Nederland, Co
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    Having done the m-21 swap I'd say go for the saginaw 4 speed. The muncie requires drive shafts be lengthened and shortened. With a v6 your not going to break either one.
     
    Rralphs, Jul 28, 2010
    #17
  18. Jul 28, 2010
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Probably not, but why? It won't address the OP's concern which I think have been addressed sufficiently, he has 3.73 gears.
     
    sparky, Jul 28, 2010
    #18
  19. Jul 28, 2010
    dakardad

    dakardad New Member

    SLC Ut
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    Anything is possible but...not usually worth the effort.
    With 3.73 gears you will have a good road gear and a good low with the granny 1st in a 465/t-18/435. If you still want the Warn OD you'll have to go with a Model 18 TC offset diff etc.
    That low first has allot of uses beyond Crawling. The V-6-465-20/18 is a solid setup well suited to a jeep of your year.
    Ive had great success with Novak stuff and they have good tech support.

    My 2c.
     
    Last edited: Jul 28, 2010
    dakardad, Jul 28, 2010
    #19
  20. Jul 28, 2010
    muley68

    muley68 New Member

    midwest
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    i dont want to run to fast yet one i need a speedo cable and two my frontend wanders something fierce....on the speedo subject i have 700/15's on the jeep now basicaly 30" tires i want to go to 33's with a lift is there a certian speedo gear i can buy to compensate for the larger tire over stock gear ratio?
     
    muley68, Jul 28, 2010
    #20
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