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4.10's and 42's is this a bad idea?

Discussion in 'The Garage' started by zakk, Oct 31, 2002.

  1. zakk

    zakk 1/2 ton status

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    4.10\'s and 42\'s is this a bad idea?

    Well, is it?

    the 39.5's are looking scall and the truck is not really a DD anymore, and when it is going places it is usually at freeway speeds and then in 4LO at the trail. i have no doubler, 1 ton axles, TH350 ~275hp mod'd GMPP 350
     
  2. GMslave

    GMslave 1/2 ton status

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    Re: 4.10\'s and 42\'s is this a bad idea?

    It's gonna be sloooooooooow. But it will work. Swap in a 4 speed, or jus re gear to 4.56 or 4.88.
     
  3. TWISTEDJACK

    TWISTEDJACK 1/2 ton status GMOTM Winner

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    Re: 4.10\'s and 42\'s is this a bad idea?

    I run 4.10 with 35's and wish they were lower. I would go to 5.13. I am going to 4.88 and run 38's. 42's and 4.10's=no power. The only way I would run that combo would be a BBC and a doubler. my $.02
     
  4. Shaggy

    Shaggy 3/4 ton status

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    Re: 4.10\'s and 42\'s is this a bad idea?

    <font color="green"> I gotta think it would suck. I was running 38s and 4.10s that was pretty borderline, and I have the 465. I'm going to 42s during this buildup and I've installed 5.13s. 4.88s would be fine too, but 4.10s... that's just going to suck. </font color>
     
  5. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    Re: 4.10\'s and 42\'s is this a bad idea?

    i have 4:10's with a 350ci sm465np205 with 38's and i wish like hell i had 4:88's id say get the 5:13's /forums/images/graemlins/smile.gif if your going to re gear do it right the first time and go with the 5:13's /forums/images/graemlins/smile.gif
     
  6. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Re: 4.10\'s and 42\'s is this a bad idea?

    Normally I would agree with rest of the posts, but my friend ran 42's with 4.10 gears for years. It was mostly a mud truck at the time with a mild to moderate 454 and he never really complained. He eventually went with 4.88's when he started doing more trails and now has 38's. On the other hand another friend has 4.88's with 39.5's and wished he had much lower gears.
     
  7. mountainexplorer

    mountainexplorer 1/2 ton status

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    Re: 4.10\'s and 42\'s is this a bad idea?

    My Crew Cab with 40" tires and 4.10 gears makes the approx. 400 horse 402 feel like a 125 horse 305 at times.

    The truck I just bought has 44" tires and 4.10 gears. When I picked it up from my friend's house, the T-case shifter or front driveline wasnt hooked up. I drove home and gearing and power feld surprisingly good for a 350, almost too good, like my Suburban with 4.10's and 33's. I then realized that the T-case was in 4-low the whole time. First time I drove down the highway in 4-low going the speed limit.

    I have yet to see how gutless the thing is in 2-high.
     
  8. burbBoy

    burbBoy 1/2 ton status

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    Re: 4.10\'s and 42\'s is this a bad idea?

    I guess it depends on the type of wheeling you do. Im running 40's, SM465/NP205 and 4:10's and i have no problem on any trails in my area. In 4 low granny gear i can get out and walk next to my truck, which is enough gear for me /forums/images/graemlins/smile.gif

    Brian
    82 Burb
    40" TSL's SM465/NP205, D60/14FF
    welded and rear disc.
     
  9. SAVAGE1

    SAVAGE1 1/2 ton status

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    Re: 4.10\'s and 42\'s is this a bad idea?

    This is what I'm running right now on a 700r4. It pretty much sucks off the line but once it gets going its cool. Kinda feels like I'm "towing" all the time. This is only temporary, 5.13's are on the way.

    You can check it out <font color="red">IF</font color> I make it to Pismo.
     
  10. zakk

    zakk 1/2 ton status

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    Re: 4.10\'s and 42\'s is this a bad idea?

    hell, to check it out i'll PULL you to pismo!
     
  11. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Re: 4.10\'s and 42\'s is this a bad idea?

    I've got a 350TBI/TH400/NP205 with 4.56 turning 42s in a much lighter rig and I feel they are barely border line. You've got some lower gears in the t&amp;t but that won't make up for the diff, especially the weight. I would be hessitant unless you plan to go to a doubler or regear soon, especially if you ever drive on the street...
     
  12. 72THING

    72THING 1/2 ton status

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    Re: 4.10\'s and 42\'s is this a bad idea?

    I wouldn't recommend it. My friend has 4.10s with 44s and a mild 355 ci and 465/205 and it's not low enough. But he has 5.13s on the way. I'm running 4.56s with 39.5s and a 465/205 and it does pretty good, even though sometimes I wish I had 5.13s.

    Will
     
  13. Kamots

    Kamots Registered Member

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    Re: 4.10\'s and 42\'s is this a bad idea?

    a good idea is to multiply ur tire size by .12 an it will give you a general ballpark on gearing. It comes up with 5.04 meaning you need in the 5's for gears to really move that rig. Good luck either way, its ur rig have fun.. /forums/images/graemlins/tongue.gif

    Kamots
     
  14. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    Re: 4.10\'s and 42\'s is this a bad idea?

    I am running 4:56's w/ 38.5's and I intend to upgrade my ratio to 5:13's , Not enough pull for my tastes Off-Road! /forums/images/graemlins/angryfire.gif
    Bill
     
  15. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Re: 4.10\'s and 42\'s is this a bad idea?

    Where did you derive with the .12? What exactly is the meaning of doing that? If we knew what that number represented maybe we all would have a better understanding of things.
     
  16. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    Re: 4.10\'s and 42\'s is this a bad idea?

    I have a friend with a Bronco on 42's. We geared it 5.13 with no OD and it runs great RPM's at 70. I'd say 5.13, but if you have OD (below 1:1 last gear ratio), go a little lower.
     

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