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Looking for gearing recommendations...

Discussion in 'The Garage' started by FWP, Apr 8, 2004.

  1. FWP

    FWP CRS

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    The other 38" thread got me thinking about my setup. Instead of hijacking the other post, I'll ask in this one.

    What gears would you recommend for my setup? I drive it on the highway...

    TBI 355, Built TH350/ 2000 stall converter, 203/205, 14BFF, 38.5/14.5/15 SX (actual height at 25 psi=37.5") on steel wheels. Truck weighs 6800 lbs.

    Let me hear what you have to say! TIA
     
  2. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    with the auto i would PERSONALY run 4.56's
    if there was something for the 14 bolt between 4.10 and 4.56 i would run it.
    i have ridden in your rig and you have offroad gearing down. it also didn t lag to much from what i could tell with your trailer behind you.

    if it was MY rig, i would yank out that sludge box and put in a 465. oh, wait i DID that in my rig. i will be running 4.10/42's/465 doubler. engine for now will be 350, then one day 6.5LTD or a 454vortec
    the only proble i will have will be with highway driving. ill have two choices. rap the motor out in 2nd, or bog down a bit around 65MPH. the highest i think i would take my rig would be 70mph.

    i am contemplating looking at new gears as i will be able to since i will be buying a new carrier for the front anyway. im thinking about 4.56's thne i can get thick gears for my 14 bolt. it would cost a bit mroe than planned, but is doable.
    Grant
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I think you'd do well with 4.56's...

    Rene
     
  4. FWP

    FWP CRS

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    I was thinking the same thing /forums/images/graemlins/wink.gif
     
  5. 4xcrazy

    4xcrazy 3/4 ton status

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    [ QUOTE ]
    I think you'd do well with 4.56's...

    Rene

    [/ QUOTE ]

    Ditto /forums/images/graemlins/waytogo.gif
     
  6. zakk

    zakk 1/2 ton status

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    my input is not needed.
     
  7. bigcountryk5

    bigcountryk5 1/2 ton status

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    i do fine with 38's and 4.56's
     
  8. Hossbaby50

    Hossbaby50 3/4 ton status

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    Let me borrow your new shoes and I will try them out on my 4.56's in D and let you know. /forums/images/graemlins/rotfl.gif

    I think 4.56's is the better bet then 4.10's. I know I spin 3K in D with 4.56's and 35" MTR's for 65 MPH. They are only really 33.5" so though.

    With an actual height of 37+" 4.56's would be a good gear. RPM calc say 2650 RPM at 65. I used to run that when I had 4.56's and 32's with my OD. I really liked my cruise power at that RPM. I was kinda pissed when my 35's took that away, but thankfully TPI has made up for some of that.

    4.56's /forums/images/graemlins/thumb.gif

    Harley
     
  9. Hossbaby50

    Hossbaby50 3/4 ton status

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    We can just swap axles if you want. You can have my 4.56's and I will take your 4.10's. I just redid my balljoints so if your kingpins are in good shape we will call it an even swap. I will even drive to Prescott and help you swap them. /forums/images/graemlins/histerical.gif
     
  10. FWP

    FWP CRS

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    /forums/images/graemlins/histerical.gif good one harley, thanks /forums/images/graemlins/histerical.gif
     
  11. FWP

    FWP CRS

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    [ QUOTE ]
    my input is not needed.

    [/ QUOTE ] oh c'mon zakk, you're input is always needed /forums/images/graemlins/rotfl.gif
     
  12. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    I find this to be most handy in cases like this. Just make sure you use actual tire diameter rather than stated...

    [Edit] For my opinion, based on what I (think I) know of you and where you will likely be going in the future... /forums/images/graemlins/wink.gif

    I would say go 5.13. Then if you want to go 39.5 IROKs or something you will be set, and until then, it will be nicely responsive without being completely out of hand at highway speeds. If you sure you’ll stay where you are in tire size, then I would probably agree with 4.56. But it also depends on the torque curve of your motor, tendency toward performance vs. mileage, ratio of freeway to highway to back roads, etc…
     
  13. BIGJ

    BIGJ 1/2 ton status Author

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    5.13 How much longer is it really gong to be a DD?

    I wish I would have gone with 5.13's when mine was a DD. Now that it's a trail truck, I've got to spend another $300+ for the 5.13's.

    BIGJ
     
  14. marv_springer

    marv_springer 1/2 ton status

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    I say get 3.55 gears in the Cummins tow rig that you're gonna get./forums/images/graemlins/histerical.gif

    Leave your axles alone!...

    Need more gear off road?
    Do the WMS 3:1 in the 203.

    Need more pulling power on the hi-way?
    Get the diesel tow rig.

    Blazer's a little slow on the road w/ the heavy tires?
    So what!?.... you racing anybody?! or do something about it and build a BB../forums/images/graemlins/grin.gif

    ..... just my uncalibrated opinion....

    Marv
     
  15. tarussell

    tarussell 1/2 ton status

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    Since you have a slight stall I would say go for more gear . 5.13's are still do-able with that O.D. tire and no O.D. in your tranny. I say gear it to where it performs like it should off-road not just to where it does O.K. .
    JMHO , Tom
     
  16. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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