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What will the final ratio be?

Discussion in 'The Garage' started by wayne, Jan 19, 2003.

  1. wayne

    wayne 3/4 ton status

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    Ok, what is the final crawl ratio for an SM465 (6.55 1st) with a 241 case (2.72 low) and 4:56 gears? /forums/images/graemlins/thumb.gif
     
  2. heavy4x4

    heavy4x4 1/2 ton status

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    81.25 - not bad at all /forums/images/graemlins/thumb.gif
    I've got something like 28. /forums/images/graemlins/frown.gif

    Just multiply all the numbers together....or go to www.4lo.com
     
  3. Pure Insanity

    Pure Insanity 1/2 ton status

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    One of the best gear calculators I have seen yet is on a site I am a mod at.

    Pick the tranny you have, SM465, pick the Tcase you have, NP241, then add your ratio. It gives you the ratio of every gear and high and low combos. Killer gear calculator.

    http://www.florida4x4.com/tech/gearcalc.php heres a link straight to the calc.
     
  4. Pure Insanity

    Pure Insanity 1/2 ton status

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    Oh and for some reason, sometimes the whole page wont load and ya may have to try again. And again. Sometimes it will fully load sometimes it wont. 99% of the time it will give all the low range info tho.
     
  5. florida4x4

    florida4x4 1/2 ton status

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    arrgh, If you dont have a P4 you may have to wait a while since it calculates every gear with tire sizes from 27"-44" and displays a range of speeds... takes a while on my P233MHz /forums/images/graemlins/tongue.gif
     
  6. wayne

    wayne 3/4 ton status

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    Worked great on my puter. Thanks for the link. I was able to figure out a few different things with it. /forums/images/graemlins/thumb.gif
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Good link...but it has the wrong ratio for third gear in a SM465. The ratio is 1.70:1 not 1.57:1

    Rene
     
  8. Pure Insanity

    Pure Insanity 1/2 ton status

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    My puter is a P3 but sometimes it loads fine sometimes it brain farts. /forums/images/graemlins/tongue.gif
     
  9. 87sm465np208

    87sm465np208 1/2 ton status

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    yep thats better then mine, which is 52:1, but i guess it does me fine since i rarely ever use it unless im in a serious situation off-road going down or up a hill, pulling someone out of a hole, or in a vacant parking lot showing off infront of friends as i put it in low low and walk along side of the truck, gotta love the sm465 /forums/images/graemlins/thumb.gif.

    /forums/images/graemlins/usaflag.gif /forums/images/graemlins/truck.gif
     
  10. florida4x4

    florida4x4 1/2 ton status

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    1.70 is the sm420
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    MJ had a SM465 apart and counted teeth...the 465 is also 1.70:1 and always has been.

    Rene
     
  12. wayne

    wayne 3/4 ton status

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    Good eye Rene, you are correct it is 1.7. /forums/images/graemlins/thumb.gif
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    It's funny that so many publications and so called reliable sources have that bit of trivia wrong.

    Rene
     
  14. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Hay now that's a neat calculator.
    I always wondered what speed I was going when I was spinning 3200 RPM in 3rd /forums/images/graemlins/smile.gif hehe didn't think old DOllar had 80mph in her LOL.
     
  15. yunit

    yunit 1/2 ton status

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    Does not add the 2:1 for the torque convertor though.
    I added the convertor ratio and this is what I got.
    Now.
    First gear: 4.96 x T-case low: 4.1 x Differential: 4.56 = Final Drive: 92.73
    With 5.13's.
    First gear: 4.96 x T-case low: 4.1 x Differential: 5.13 = Final Drive: 104.32
    With 5.13's and 2.75 first in the TH400.
    First gear: 5.5 x T-case low: 4.1 x Differential: 5.13 = Final Drive: 115.68
     
  16. florida4x4

    florida4x4 1/2 ton status

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  17. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I have a SM465 apart at a friends house...I'll do some counting and some math and let you know.

    Rene
     
  18. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    You should take the time to count gears now and then instead of blindly trusting everything you read.

    low...............2nd....................3rd
    input.....17.....input.......17........input....17
    counter..40.....counter....40........counter..40
    cluster...14.....cluster.....23........cluster..36
    speed....39.....speed......35........speed....26

    ........6.5546...........3.5805.............1.699

    Here is the post...

    tooth counts for SM465

    Rene
     
  19. florida4x4

    florida4x4 1/2 ton status

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    send me the fawking transmission and i'll be glad to /forums/images/graemlins/thumb.gif Hey no offense but that is a tall order and I dont recall being on your payroll /forums/images/graemlins/rolleyes.gif
     
  20. m j

    m j 1/2 ton status

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    I do see a few posts in this thread claiming you know WTF you are talking about though.

    rather then cop an attitude when you are corrected you should try something like 'thanks for showing me the FACTS tRusty, I was in error trusting other morons info.'

    for what it is worth I sent the correct info to the Pirate site but they continue to list the wrong info.
    their 'bible' is pretty useless if it is full of inaccuracies that they do not correct.

    the thread that started me counting
     

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