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find your crawl ratio

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  • goodtimes
    replied
    Originally posted by YJWOLF
    Anyone got an idea of what an auto tranny actually puts out gear wise? The TF999 has a 1st gear 2.74, but with the torque converter its what? Ive heard both an extra 2:1 or 3:1 for autos but never and actual calculation. Anyone got any ideas?
    There is no way of coming up with a hard number for that. It all depends on a whole slew of things, including the mechanical gear ratio (tranny, xfer case(s), differentials), the engines output, load on the powertrain, the specific torque convertor, the viscosity of the fluid, etc.

    Think of it this way, it could be 1:1 (torque convertor locked while cruising down the freeway), or it could be infinity:1 (idleing at a stop light....the engine turning around 700rpm, vehicle not moving), or, more realistically, somewhere inbetween.

    I was on a run out here in AZ early this year with a group of guys from various clubs. One of them had a pretty new buggy out. He said that running the auto instead of a manual felt about like adding a 2:1 underdrive to it. Take that with a grain of salt, it is only a seat of the pants estimate.

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  • RatherBeJeeping
    replied
    My tranny and my t-case aren't on there...

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  • TommyJeep
    replied
    Haha, it's all good... I do like the drop down boxes. Makes it a lot easier to add a tranny when someone sends you gear ratios. Oh yeah, you'll be getting emails all the time, "Why don't you have my tranny listed? Here's my ratio's."

    I've got a few emails saved that I haven't added to my page. I'll have to get them to you if you want them.

    Leave a comment:


  • Cetrov
    replied
    Damn it I stole the sucker and changed it's color!!!!

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  • TommyJeep
    replied
    Man, that calc looks REALLY familiar....

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  • igofshn
    replied
    It doesn't have the TF999. All I know is I could climb Cadilac Hill without touching the gas. It was fun.

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  • YJWOLF
    replied
    Anyone got an idea of what an auto tranny actually puts out gear wise? The TF999 has a 1st gear 2.74, but with the torque converter its what? Ive heard both an extra 2:1 or 3:1 for autos but never and actual calculation. Anyone got any ideas?

    Leave a comment:


  • Guest's Avatar
    Guest replied
    Nice calculator, but it doesn't work for me. No listing for the Dana 18. That's ok though, I know that the majority of this BB has the NP231 or the Dana 300.

    I know Al and I have already discussed the gearing for the Auto thing, but this month, one of the mags even used that formula for figuring out the Automatic trannies crawl ratio. NO, mention of torque conversion. Now, I KNOW, after talking to Al and a local friend that they do make for a big factor, but NOT in the raw mathmatical numbers. I've watched my buddy work his auto, flawlessly up some stuff, with some higher gearing, but the torque converter helped keep the power applied.

    Anyhow, gotta go with the numbers when figuring crawl ratios, but gotta go with what you know when you see it happening.

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  • NAILER341
    replied
    they came up pretty good with the auto, and the 4:1
    what trans does he have in that thing?

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  • Guest's Avatar
    Guest replied
    Wait till AL (Igoshn) see those crawl ratio's for the auto !!! It's not gonna be pretty !

    I dont think their calculating torque conversions in there ?

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  • NAILER341
    replied
    that is a great calculator!

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  • Cetrov
    started a topic find your crawl ratio

    find your crawl ratio

    worth saving in the favorites section

    link to calculator
    Last edited by Cetrov; 08-10-03, 10:45 PM.
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