Gear Ratios: Misinformation at its worst.

Discussion in 'Experienced Truckers' Advice' started by Hammer166, Apr 28, 2021.

  1. AModelCat

    AModelCat Road Train Member

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    I've always called ratios like 4.10, 4.33, 4.56 etc low gears and 3.55, 3.08 etc high gears. Like a transmission, start out in low gear and shift up to higher gears.
     
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  3. Hammer166

    Hammer166 Crusty Information Officer

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    We had one in silver with red stripes. Had an Offy dual plane with a 4bbl, big cam and headers. AMC refused to warranty the rear end after #3. So it got a Dana. Dad surprised a lot of supposedly fast cars with that little beast.

    My aunt drove it 45 miles with the oil light on, on her way to pick up her Vega dad had been working on. He was not amused.
     
  4. wore out

    wore out Numbered Classic

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    My point was the ring gears are same diameter, the higher geared is not bigger or taller
     
  5. Bean Jr.

    Bean Jr. Road Train Member

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    It's the opposite. The pinion turns 3.55 turns for the ring gear's one revolution.
     
  6. Rideandrepair

    Rideandrepair Road Train Member

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    Lol, that’s just too obvious isn’t it!! I still had my terminology backwards!! Too funny.
     
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  7. Hammer166

    Hammer166 Crusty Information Officer

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    Have you seen any pinions out of these really tall rears? Suckers are huge, like saucer sized.
     
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  8. wore out

    wore out Numbered Classic

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    Dang it, I haven’t got to put a eye on one yet
     
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  9. Hammer166

    Hammer166 Crusty Information Officer

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    I was hoping it showed in this picture, but no such luck. I can hardly imagine the shock load it took to break a hunk out of a ring gear like this. SmartSelect_20210504-073625_Photos.jpg
     
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  10. SmallPackage

    SmallPackage Road Train Member

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    You figure they are getting closer to a 1:1 direct just in the rear so the pinion has to have almost the same amount of teeth and be close to the same size.
    Gotta have a bigger bulge in the side for clearance right?
    I would think that puts more weight in the housing too.
     
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  11. SmallPackage

    SmallPackage Road Train Member

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    Remember back in the late 70’s-mid eighties when the engineers were putting 2.25, 2.56, and if you bought a “muscle car” you got a 3.08 in the rears for gas mileage? 200 hp smogged 302’s with weak overdrive 4 speed auto trans and 305’s with metric 3 speed th250’s with no overdrive. I think even most standard spec pickup’s were like that. Sad days!
    Now they are back using 3.55’s or higher and 6,8,or 10speeds with a couple or three od top gears.
    Car engineers finally thinking like the old school truck builders and the truck builders thinking like the disco era car builders. Upside down imo.
     
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