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Thread: 4.56 or 4.88's for a CJ

  1. #1
    Junior Member 84jeepjohn's Avatar
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    Default 4.56 or 4.88's for a CJ

    OK this is from my pst on JU, I'm off to go drive the CJ so I'm just pasting it in... what do ya'll think?

    NOW I am going to do my gears and lockers... go figure BIG QUESTION is 4.56 or 4.88.... here is the set up

    258 (about to get MPI) T5 trany. dana 30 and amc 20 rear (with 1piece axles)
    35" tires and currently 4.10's in the back (stock up front....NO COMMENT LOL)

    I am looking at t trutrac for the front and an OX for the rear, and I'm firm on them... I'm just up in the air on gears again. My buddy JUST put in 5.13's in his TJ but it has a 6 speed, and his advice is go 4.88.... well he has not even gotten up past 45MPH, cause that's what I'm worrying about.

    I'm gonna have to DD this thing for at least another 2-3 years (then I get to get the tow vehicle ) so I need it at least semi streetable LOL.and I do not want it screaming at highway speeds. NOW I do not expect to be pulling 80-85 (that's just bad ju-ju in mine) but I'd like to ba able to drive it above 55-60MPH

    my OTHER wrench in the equasion is if I can EVER wear out my 35's I will get 37's NOW I KNOW what the usual is on 37's and stock running gear, BUT I do not wheel this thing AT ALL for now (but when we move there might be some decent wheeling. I'm chosing Air Force bases with a slant to where wheeling is around the base LOL)

    So like I said I understand the short life of parts with the 37's but like I said it will only be wheeled light to moderatly.

    Now my wife mentioned that "'you know we have the burb to go down to the city, and go places with the family" so yeah this will be more short hops by myself and just going to work in it. Man she's telling me to say screw it and get the 4.88's LOL

    I'm gonna take it out today and get it up to speed on the hi-way to see where I'm at (remember 6 moths in afghanistan, I've only gotten to pull this thing into the driveway yesterday LOL)

    So what do ya'll think 4.56 or 4.88????
    84 CJ-7 Larado, 35"BFG MT & R.E. 4.5 lift, TJ flares, SRSw/ buggy springs.

    Install this weekend: Borgson steering shaft, 1" poly BL, AND OX front & rear with 4.88 gears
    http://i2.photobucket.com/albums/y34...687_edited.jpg
    SOLD 00 Grand Cherokee Larado
    05 Z71 Suburban 2.5" t-bar crank & 1.5" rear spacers (285/70/17 MT's in the near future)

  2. #2
    Administrator miljeep's Avatar
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    I really wish I could help you with this, but this is waaaay above my current jeep skill level.

  3. #3
    Administrator korisu56's Avatar
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    If you're considering going 37's, I would imagine 4.88 or 5.13's would be your question. I'm not a CJ guy, but what I do know is that it is a pain in the ass enough not to do it more than once. Good luck with your answer hunting.

  4. #4
    Bobble Head Jeeper trailsnail's Avatar
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    I'm going to have to go with Ryan on this one. But here is something that may help you make up your own mind.

    http://www.4x4offroads.com/gear-ratio-chart.html

  5. #5
    Administrator korisu56's Avatar
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    According to that chart 37's should have 4.88 or 5.13. I would go with 4.88 probably and here's why.

    You are currently on 35's so you'll get performance affect from the said gear set. However, if you went 4.56, I personally feel a bit sluggish on 35's, and when you made the bump up to 37's you'd really feel it. 4.88's would be on the low end of "Good Average Performance", which is right up your alley for a DD.

    Just my .02, and everyone on here knows I don't know much. Let us know what you go with.

  6. #6
    Bobble Head Jeeper trailsnail's Avatar
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    Definatly let us know, but also let us know how it rides.

  7. #7
    Administrator Truck's Avatar
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    I have 5.13 in my D60s on my Scrambler running 37s. I like them, but I also have a V8.

    Truck
    Last edited by Truck; 04-25-2008 at 13:16.
    Quote Originally Posted by korisu56 View Post
    Im in no position to. Mine doesn't work.
    Quote Originally Posted by miljeep View Post
    Oh, thanks to Nate who stopped by tonight and helped a struggling old bald man pitch a tent.
    83 Scrambler, bought in 94...starting to rust away..."we can rebuild him" Now in pieces all over the garage
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  8. #8
    Senior Member HillBillE's Avatar
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    Just got back from Moab, my buddy's CJ is running 34'' tires, 4:10 gears, 258 w/MC2100 and "Nuttered" and the T176/D300.

    (My buddy is 'mblackmarr' on JU, he may have responded to your post there)

    He had a hard time holding 70+ on the flats, and was getting a lot of blowby at that speed. (Holding around 3K rpms.)

    Being as you have a 5 speed, 4:56 would be perfect in my opinion, but if you're sure about going to 37'' tires, than I'd go with the 4:88's, and live with the shortness of speed until the bigger rubber went on.


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  9. #9
    Administrator korisu56's Avatar
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    Hillbille! Where's the pics of Moab dude!

  10. #10
    The Cow Shall Rise Again theyeti1775's Avatar
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    PM Georgia for the CJ site we found the other night. Pretty helpful folks on there. Or just fire me a PM and I'll get it late tonight when I finally get home.

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