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uhhh... the jeep done better?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by camango, Apr 23, 2002.

  1. camango

    camango Registered Member

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    Can anyone tell me why my 88 Jimmy (5.7) can't hold a candle to my 97 Jeep Grand Cherokee (V8) when it comes to towing my travel trailer?
    Jimmy has a higher tow rating, more horsepower, more torque, and is a LOT BIGGER!
    the jeep towed the trailer like a champ - the Jimmy is towing it like a chump - what gives?

    thanks
    -Lou
     
  2. Hossbaby50

    Hossbaby50 3/4 ton status

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    The extra weight the Jimmy is hauling around on itself. Your Jimmy probably outweighs you Heep by 800lbs or more.
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The Grand actually has 20 more hp, is lighter and prolly has better gears.

    Rene
     
  4. HarryH3

    HarryH3 1 ton status Author

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    Find the RPO sticker for the Jimmy. It should be in the glove box. Look for a code that starts with the letter G. It's probably got 3.08's or 3.42's in the axles. Not the hot ticket for towing, especially if you've added taller tires. /forums/images/icons/frown.gif
     
  5. camango

    camango Registered Member

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    jeep has 10 more horsies, 15 less ft/lbs, and weighs 900 lbs less
    not sure of the jeep gear ratio, but it did haul ass, and could cruise at speeds over 80mph easily - so not too low or high
    my jimmy must have the 3.42s - blimey - how much will it cost to change to 3.73s?
    thanks
     
  6. HarryH3

    HarryH3 1 ton status Author

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    Here are the RPO codes:

    GU4 - 3.08
    GU6- 3.42
    GT4(or 5X1)- 3.73
    GT8(or GT5)- 4.10
    G80- Gov-Loc
     
  7. camango

    camango Registered Member

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    there's a GU6 and a G80 - how do i know what i gots?

    thanks
     
  8. camango

    camango Registered Member

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    3.42s - $h1t - so what's the GT4s gon cost me?

    thanks for all the info
     
  9. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    i got a 12 bolt with 3.73 in it. 200 and its yours.
    better than buying a new r/p for your 10 bolt. or you could buy a 14 bolt and help your towing needs out and put disk brakes on it.
    grant
     
  10. Sparky

    Sparky 1/2 ton status

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    Your grand cherokee has your blazer beat on the power to weight ratio which is why it feel like its pulling better. Also, it probably has steeper gears. On the other hand, your blazer is heavier and has a stronger frame and is therfore more stable for pulling a heavy load. It will probably stop better too. Sometimes when people try to stop fast with a load and a light vehicle the weight will transfer up on the hitch and just about lift the back wheels off the ground. Oh, and it can handle alot more tounge weight too.

    Sparky
     
  11. mike reeh

    mike reeh 1/2 ton status

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    not to piss in your cheerios or anything but I wouldnt spend too much money going from 3.42 to 3.73.. thats barely a couple hundred rpm difference at 65mph. I mean if you get a great deal on an axle with 3.73's then try it out but if you're gonna spend money on gears & carrier & installation, go with at least 4.10.. what size tire does your blazer have?

    mike
     
  12. camango

    camango Registered Member

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    got 31's on there now
     
  13. four_by_ken

    four_by_ken 1/2 ton status

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    Remember also, you are comparing an 88 with a 97 vehicle. A LOT has changed in 10 years.

    Ken H.
     
  14. Confederate9

    Confederate9 1/2 ton status

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    " not to piss in yor cheerios"

    haha thats funny!
    has brightened up my day
     
  15. Rebel88

    Rebel88 1/2 ton status

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    i got a 3.73 ring and pinion from a 10 bolt laying around...make me an offer if you want it

    Later
     
  16. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Like others have said, if your gonna change gear ratios, jump at least 2 steps. If you only need one step, you probably don't need the gear change and it will never "pay off" in any noticeable way. The difference is just not enough to matter.

    As for swapping the R/P. I also have to agree with finding a 12 bolt/Dana 44 combo with the gears you want. The 12 bolt rear will be stronger than the 10 bolt. Swapping axles is easy and cheap, swapping 2 r&p is not. And you can sell your 10 bolt pair to recoup some of the cost. If you happen to find a matched 10 and 12 bolt that's fine too. 10 bolt and Dana 44 are almost exactly the same strength wise. However, if they are under the same donor vehicle you are very unlikely to find a 10 bolt with a 12 bolt. Only problem is, 4.10 gears are not very common in 1/2 ton running gear. Might get lucky and find a light duty 3/4 ton with a 14 bolt semi-float rear that is geared 4.10 and has 6 lug axles, they are out there. Or even go full 3/4 ton with 8 lug if that makes sense for you. Then you get the better brakes and a full float rear axle too.
     
  17. chaka454

    chaka454 1/2 ton status

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    If you're thinking of regearing you should go with 410's why spend all the money to like the other guys said if you're going to 373's it's not worth it you wont feel that much of a difference go with 410's and you will feel the difference, I did I went to 410's and they're great.
     

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