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Overdrive with an automatic

Discussion in 'Early CJ5 and CJ6 Tech' started by Patrick, Oct 30, 2015.

  1. Patrick

    Patrick Super Moderator Staff Member

    Have any of you run an overdrive with an automatic transmission? More specifically, a Warn style on the D18?
    The Tux has a TH350, and 4.88 gears, 33" tires. It does OK, but an overdrive would be handy. I'm sure the transmission would have to be put in neutral for the OD to shift, but I'm not sure if the output shaft would slow down enough, quickly enough, for the OD to shift smoothly...Thoughts?
     
    Patrick, Oct 30, 2015
    #1
  2. Glenn

    Glenn Kinda grumpy old man Staff Member

    How about reverse thinking on this. Put it in OD before you get on the highway and then you wouldn't need to worry about the shifting dilemma. Personally I'm skeptical of it working without shortening the synchro life. It doesn't seem like it would have any trouble taking off from a stop in OD. What is the 1st gear ratio of the 350? How does it compare with T14?
     
    Glenn, Oct 30, 2015
    #2
  3. jpflat2a

    jpflat2a what's that noise?

    The two guys I know with autos in their Jeeps either shift prior to driving on the highway, or simply let off the gas and shift the overdrive.
    Not saying either way is right or wrong...it's how they do it.
     
    jpflat2a, Oct 30, 2015
    #3
  4. Patrick

    Patrick Super Moderator Staff Member

    Oh it would certainly start out just fine in OD, but I would like to be able to shift.
     
    Patrick, Oct 30, 2015
    #4
  5. Patrick

    Patrick Super Moderator Staff Member

    Have they been using this setup for any amount of time? I'm guessing they have....And no issues with the OD synchros
     
    Patrick, Oct 30, 2015
    #5
  6. Glenn

    Glenn Kinda grumpy old man Staff Member

    Since an auto would be more forgiving I'd bet shifting into OD would be the lesser of 2 evils, shifting out might get interesting though, or maybe not?
     
    Glenn, Oct 30, 2015
    #6
  7. Patrick

    Patrick Super Moderator Staff Member

    I guess I'll just have to find out...:)
     
    Patrick, Oct 30, 2015
    #7
  8. Glenn

    Glenn Kinda grumpy old man Staff Member

    It's definitely worth a shot. :)
     
    Glenn, Oct 30, 2015
    #8
  9. jpflat2a

    jpflat2a what's that noise?

    Yes
    5.89s and 35" tires
    no issues I've been aware of.
     
    jpflat2a, Oct 30, 2015
    #9
  10. scott milliner

    scott milliner Master Fabricator

    Overdrive instructions say. Transmission should be shifted into neutral then shift.
     
    scott milliner, Nov 1, 2015
    #10
  11. Patrick

    Patrick Super Moderator Staff Member

    I do have all the paperwork from the OD I had in the old Jeep.....I guess I could have read through it..:)
     
    Patrick, Nov 1, 2015
    #11