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gearing with 6.2 and 35" tiers

Discussion in '1982-Present GM Diesel' started by 84CUCV, Mar 21, 2005.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    I have a stock m1009. I was offerd old tsls for 100 bucks. I was just wondering what it would be like with 3.08 gears and 35s. Thanks guys

    mike
     
  2. kennyw

    kennyw N9PHW Premium Member

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    It will probably be slower than molasses. 4.56 gears would be ideal with the 35" tires for power, 4.10's would be better for economy. But I don't think anyone would like driving it with the 3.08's and 35's.
     
  3. joez

    joez 1/2 ton status

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    I have 3.73's and 36's, its a turd and a half. It gets me where i need to go, but dont expect to win any drag races.
     
  4. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Will i still get good MPG? Or will that be killed? Thanks guys
     
  5. imiceman44

    imiceman44 1 ton status

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    You will get better MPG but you need to watch the tranny temp or shift manually.
    I have that setup with a manual and I like the fuel economy.
     
  6. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    OK bare with me for a second please. I know very little. How will this affect my 400?


    Thanks mike
     
  7. imiceman44

    imiceman44 1 ton status

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    Well a th400 will take more abuse but when you run low RPM's that means your torque converter is not going to be locked much and the tranny will be also hunting for gears to match power to speed so there will be heat in the fluid system.
    A tranny cooler could come in handy in this situation.
    :D
     
  8. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    OK i got what your saying

    thanks mike
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Perfect gearing for mileage...~2000 rpm at 65 mph. Gonna suck at everything else though.

    Rene
     
  10. savagek5diesel

    savagek5diesel 1/2 ton status

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    i have 3.73 gears and 35's. but i live in nor cal and i have to ride the freeways with lots of big steep grades and it sucks. i'm going 4.88's when i get my 1-ton axle here in the next month. also i'm equiped with the 700, and i can only keep it in OD when i'm goin down hill.
     
  11. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    As for a cooler there is one in rad since my truck is m1009 or would a B&M one be a better choice? Thanks mike
     
  12. M-1028

    M-1028 1/2 ton status

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    Hey I'm running 4.56 gears 38.5 SX's and a th 400. It has pretty good power (for a 6.2) but srceams going 70.
     
  13. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Do you have the cooling from in the rad or a b&m kind? thanks mike
     
  14. kennyw

    kennyw N9PHW Premium Member

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    I'd suggest adding the largest tranny cooler you can find inline with the radiator cooler. Can't go wrong doing it that way.
     
  15. big_truxx

    big_truxx 1/2 ton status

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    I would seeing as you have an auto w/OD, suggest lower gears. now if you had a 465 manual... that 1st gear will loet you do almost anything w/o "having" to swap gears. my 75 k10 currently has 3.73's and a 465 :D running 38.5's and if they were radials, and the front pair not bald, I would have driven it home like such. But swamper sx's not great for a 1400 mi trip lol anyway if you want milage go with 3.73 or maybe 4.10 w/ 35's. if you want more power then go with 4.10 or 4.56 :waytogo:
     
  16. PhoenixZorn

    PhoenixZorn 1/2 ton status

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    In my blazer with 3.73s and a 465, it was neck snapping in low or first in 2wd, and I can't imagine what it will be with the 350 I'm puting in it... I know this is a diesel thread, but I just had to chime in. I have 31 inch tires by the way, which are way easier to turn, but I can roll along at 70 and around 2300rpm... 85 at 3000rpm
     
  17. rugger03

    rugger03 1/2 ton status

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    you cant compare the gearing for a diesel and gas truck. you can usually get away with numerically lower gears with a diesel than in a gas application. I personally will be getting some 37" tires and 4.10 gears this should be a good mixture of power and economy.

    If your going to run an after market tranny cooler run it after the radiator cooler, other wise you cool the fluid through your add on cooler then reheat it in the radiator. The stacked palte coolers are usually more compact but work better then the fin and coil designs, a 28,000 GVW plate cooler isnt much bigger than 10"x12".
     
  18. rugger03

    rugger03 1/2 ton status

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    I currently have 3.08's and 33x10.50x15's on my M1009, it isn't a dog by any means. I probally would think 35's would be pushining it, the low gear in the 400 isnt that low. You would probally get some great fuel economy and top speed on the interstate with 35's. with 33's i was getting about 680 miles per tank~ 25mpg.
     

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