Page 1 of 2 12 LastLast
Results 1 to 10 of 18

Thread: WARN ing - An overdrive-related silly question...

  1. #1
    Member Mark J's Avatar
    Join Date
    Aug 2014
    Location
    Costa Mesa, California
    Posts
    95

    WARN ing - An overdrive-related silly question...

    It's me, Mark (of the Daily Puddle).
    Now that I'm driving my 3B much more regularly, I've noticed something I never noticed when I drove this as a 16 year old child.
    Normally my "in traffic" shift pattern (with WARN overdrive) is: first, second, second-over, third, third over.
    It seems second-over and third is the same gear ratio, or if it's not, it's very close. Am I wasting my time shifting from second over to third? Sometimes it's just fun to perform this shift sequence to impress the women!
    "Wow... all those gears, and sticks!"
    Last edited by Mark J; 08-09-2021 at 10:59 AM.

  2. #2
    Senior Member 5JeepsAz's Avatar
    Join Date
    Aug 2019
    Posts
    568
    Not seeing a problem.

  3. #3
    Super Moderator bmorgil's Avatar
    Join Date
    Dec 2018
    Location
    Northwestern Ohio
    Posts
    2,190
    The technique you are using is "split" shifting or "range shifting". Yes you are wasting your time, sort of. The "ratio split" can be insignificant between second over and third, depending on your overdrive. That said you are zipping around unloaded in a gas engine vehicle. Think torque curve differences between gas and diesel. Diesels have a short torque curve, they need a lot of gears close together. Gas has a broad torque and needs ratios further apart. Heavily loaded vehicles and small engines benefit from a lot of gears when they are loaded to stay in those torque curves. The little jeep unloaded needs little help moving. This is an oversimplification but hopefully it makes sense.

    Now to the "sort of wasting time" part. It is a LOT of fun split shifting with an overdrive. Nothing like using all six gears! Especially with loud mufflers.

    Multiply your trans ratio times your overdrive ratio in each gear to get the final drive trans ratio for that gear.

    Trans ratio x overdrive ratio= final drive ratio

    The T90 is 1.55 to 1 in second. Assuming you have a .75 overdrive ratio (25% overdrive) your final drive becomes 1.55 x .75= 1.16 final drive. Third gear in the T90 is 1 to 1 so a 1.16 ratio shift to a 1 to 1 ratio is minimal.

    https://willysjeepforum.kaiserwillys...e-speed-at-RPM
    Last edited by bmorgil; 08-09-2021 at 05:26 PM. Reason: Added examole

  4. #4
    Senior Member TJones's Avatar
    Join Date
    Apr 2018
    Location
    Akron, Ohio
    Posts
    832
    I’m with bmorgil on it’s fun if you have loud pipes!!!!
    We left Toledo to get the trailer to tote the Orange Crate home and all the streets were closed downtown and the Bride was driving the pickup and I was following.
    I punched in the address on the pickup because she’s terrible with directions. The navigation took her to the freeway for a short 3-4 mile joy ride and it was the first time on a freeway with the Orange Crate, I was shocked with a V6,T90,Warn Overdrive and 5.38’s it kept up with the boss doing 60-62 at I’m guessing it was running around 3,000-3,200 RPM and I had plenty of peddle left but I was pushing it with short WB and narrow gauge I wouldn’t want to push it any more than that.
    Mark I always leave it out of OD and use the OD for forth gear, most of the time I start in second. I’m not sure what motor you have but the V6 has enough gumption to get her rolling in second out of OD.
    Last edited by TJones; 08-09-2021 at 07:03 PM.

  5. #5
    Member Mark J's Avatar
    Join Date
    Aug 2014
    Location
    Costa Mesa, California
    Posts
    95
    Quote Originally Posted by TJones View Post
    Mark I always leave it out of OD and use the OD for forth gear, most of the time I start in second. I’m not sure what motor you have but the V6 has enough gumption to get her rolling in second out of OD.
    I've got a CJ3B with the F134. It seems to get rolling best using 1,2, over, then I do the "useless" 3 under just to get it ready for 3 over if it looks like I'll be rolling a while.
    Roger that? Over! haha

  6. #6
    Super Moderator bmorgil's Avatar
    Join Date
    Dec 2018
    Location
    Northwestern Ohio
    Posts
    2,190
    Quote Originally Posted by TJones View Post
    I was shocked with a V6,T90,Warn Overdrive and 5.38’s it kept up with the boss doing 60-62 at I’m guessing it was running around 3,000-3,200 RPM and I had plenty of peddle left but I was pushing it with short WB and narrow gauge I wouldn’t want to push it any more than that.
    OK the first part of the quote... before anyone tries this at home, TJ is fearless. I have driven his CJ. It cruises to 60 with ease and handles it far too well, way to smooth. In a heartbeat that thing will get away. Tim has taken some time learning to drive it and I am sure anyone with a re-powered CJ would agree, get used to it first! The Saginaw steering box is phenomenal. It is a good experience to see what happens when you have two types of CJ's to drive. First you check out the "old school". Then you jump in the same vehicle with a much better steering system and over 3 times the horsepower. The distance between the front and back wheels becomes apparent if you want to make any quick moves. The wheel base is very short. At 60 mph it feels like it is 6 inches long. Like a big racing go kart. It runs smooth as silk and tempts you to do the wrong things. In a word... Perfect.
    Last edited by bmorgil; 08-10-2021 at 12:08 PM.

  7. #7
    Senior Member TJones's Avatar
    Join Date
    Apr 2018
    Location
    Akron, Ohio
    Posts
    832
    Oh Stop it Bmorgil...........

  8. #8
    Super Moderator gmwillys's Avatar
    Join Date
    Aug 2017
    Location
    Alabama
    Posts
    2,861
    I agree! The Orange Crate is one mean ride for sure! I loved the response that the 252 Buick offered just in the yard drive I took. It did handle like a go cart. A great piece of craftsmanship if I do say so!

  9. #9
    Senior Member TJones's Avatar
    Join Date
    Apr 2018
    Location
    Akron, Ohio
    Posts
    832
    Thank You much guys!!!
    I could of never done it without y’all’s help!!!
    Mark J these 2 guys are truly a wealth of knowledge not to mention LarrBeard and the late Pelago.
    I was full off dumb questions when I started my project a few years back and after a couple dozen dumb ones they all convinced me that there is no such thing as a dumb question, so that’s why I have what I have today. It didn’t take me long to be ALL Ears from that point on!!!

  10. #10
    Senior Member 5JeepsAz's Avatar
    Join Date
    Aug 2019
    Posts
    568
    True, shifting is very glorious. Go on, just shift and smile!! Why all this counting gears? And TJ obviously built it so well it can do things no old jeep is supposed to do. And he know its capabilities like nobody else. So, I'm guessing every ride along ends with "can we do that again?"

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •