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Gear ratio selection for the Sub

Discussion in 'The Garage' started by chvyhs, May 21, 2002.

  1. chvyhs

    chvyhs 1/2 ton status

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    I want to regear my Suburban. What's everyone's opion on gears? I've looked at the gear selection chart on 4WP's web page and they put me at 5.13's. I want to run 38" Super Swampers. I do some towing of other peoples fullsize trucks and my own fair share of wheelin. I was thinking that this gear ratio will take a lot of stress off the rest of my drivetrain and help my tired 350. My tranny is a T400 and my T-case is a NP241. Right now I have 3.73's with 36's and I spend a lot of time in low off road. I'm not worried about going over 70 mph. Is this too much gear? What are the cons?
     
  2. 1979Jimmy

    1979Jimmy 1/2 ton status

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    if your not worried about goin over 70 its alot of gear but you should be good espetially for towing and wheeling
     
  3. chvyhs

    chvyhs 1/2 ton status

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    A friend of mine has 35's with 4.56's and he wish that he went steeper. I want to see who's running something close to the same thing.
    Thanks
     
  4. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    i'm in the same boat you are, i'm runnin 3.73s and 36" TSLs and i'm going to 4.56s soon. my next set of tires will be 38"s but that's not for a while. i'll probably be 1 ton before then. so i'm going with 4.56s
     
  5. chulisohombre

    chulisohombre 1/2 ton status

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    5;13 might be a little much if you dont want to run 3000 rpm at 60. 4;56 would bring your truck back to stock with 35 inch tires.thats what i found when i did the ratio for my 35s.im not sure how strong the pinion is at 5;13 ratio either.the higher you go on th ratio the weaker the pinion is and the more stress you put on your bearings.then if you go that high you might have to get a new carrier to bring the ring gear in far enuf to align the pinion
     
  6. SAVAGE1

    SAVAGE1 1/2 ton status

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    Since you don't have an OD tranny I'd say 4.88's with 38's and 5.13's if you go bigger than 40's.
     
  7. chvyhs

    chvyhs 1/2 ton status

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  8. Blazinaire

    Blazinaire 1/2 ton status

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    These guys like to gear low don't they?! I have 4.56's with 35''s and overdrive and I still think that the gears are a bit too low. IMO 4.56's-4.88's would be a good gear for you, but I wouldn't use the 4.88's unless you did have OD. I guess it just depends on how much highway use you get.
     

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