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4.11 vs 4.56

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by delta9blazer, Oct 16, 2001.

  1. delta9blazer

    delta9blazer 1/2 ton status

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    it appears that i will be getting 4.11's, instead of my first choice of 4.56 gears.
    i've been reading the posts regarding gearing, and was wondering how much difference there is, driving-wise. i currently have 3.73's, and the 35" tires are taking hella power away.
    i can get a 12b, 4.11 set-up. 6 month warranty, for $650. i'd have to add the cost of the 4.56 R&P if i want that.
    comments?

    <font color=purple>delta9blazer</font color=purple>
     
  2. Derf00

    Derf00 1/2 ton status

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    For that kind of money, you could get a 14b w/4.56 and a locker.

    Derf00

    "A WISE MONKEY NEVER MONKEYS WITH ANOTHER MONKEY'S MONKEY."
     
  3. Burt4x4

    Burt4x4 3/4 ton status

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    Well with the 4.11 you will still have your Hwy speeds if you go with 4.56 you will have tons more grunt at low speed but your Hwy will be maxed out at 65 or less. Well unless you drive your rig wined up to 3000 to get over 65???
    I have a 4spd and the 4.11 w/35 is working fine for me....duno about your auto trany and how it would workout for ya??
    Good luck


    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  4. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    I have the 4.56 with the O/D tranny and love it...Dan

    If it ain't broke.......Don't fix it....
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  5. ftn96

    ftn96 1/2 ton status

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    Minus what Derf00 said, (which I agree with)
    The 4.11 are great gears for 33's and the overdrive. However, you have 35's which aren't much bigger. I'd say the 4.11 will be fine with the overdrive. Actually you'll never need the overdrive till you get up to about 65 on the interstate. When I had my 33's and 4.10's I cruised at 55 in drive at about 2700 (guessing since I dont have a tack).
    But 4.56's would be a better gear since you have overdrive. Just my 2 pennies.

    Surgeon General's Warning:
    Viagra and steroids may be harmful to your spouse![​IMG]
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  6. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    If I had a 700R I would have gone 4.56s.But Iv got a 350 so I went 4.10.I think it would be worth the extra $$ for the 4.56s.If you wheel much now would be the time to put some sort of traction aid in the rear also.With 4.10s,a bearing kit,Detroit,and Moser shafts I spent about $1000 on mine.

    A balanced diet is a beer in both hands.<a target="_blank" href=http://community.webshots.com/user/beaterwhang>community.webshots.com/user/beaterwhang</a>
     
  7. 90K5

    90K5 1/2 ton status

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    I have 4.11's and 33's, but I really wish I had done 3.73's. It just tops out too quick o nthe highway, and I'll be driving back and forth to college a long distance next year...

    90K5
     
  8. txbartman

    txbartman 1/2 ton status

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    I went from 3.73s to 4.56s and love it. Anything less would not have worked well for my driving. I have the 700 auto tranny and things work well on the highway. I don't usually drive above 70 MPH as I am driving an 8' wall into the wind! But, I have had it up to 80+ MPH. My gas mileage is almost teh same as before the lift install and tires. The increase from 3.73 gears countered the increase from 31 (factory) to 35" tires. But, even with 4.56 gears, there are times when I have to drive in D instead of OD on the highway. Yesterday was a good example. With a 30 MPH headwind, I had to keep it in D to try and maintain 60 MPH.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  9. 6.2Blazer

    6.2Blazer 1/2 ton status

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    When comparing 4.11's to 4.56's, it's kindof hard to really tell the difference. The same goes with 3.73's and 4.10's since it's only one step up and it's only a difference of about 200-300 rpm. On the other hand, the difference between your current 3.73's and 4.56's should be more noticable.
    Whether or not you have an overdrive trans also makes a big difference. For example with a 700r4 and it's 0.70 overdrive gear, 4.56's are like having 3.20 gears on the highway.
     
  10. delta9blazer

    delta9blazer 1/2 ton status

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    i agree that one might find a 14b set-up for close to the same price, but i would have to add in wheels, and sundry other bits for the install. a 12b will drop in, and add a little strength in the process.
    i have the auto/overdrive tranny, so i don't think 4.56's would be too low. if everything else were equal, i would go for the lower gears, i don't need to go much faster than 80 or 90 in any event.
    i just don't want to be kicking myself in 4 months, cause my truck still won't hold highway speeds.

    <font color=purple>delta9blazer</font color=purple>
     
  11. txbartman

    txbartman 1/2 ton status

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    If you don't want to kick yourself, go with 4.56s. With an OD tranny, I don't think you will find any negatives. It's just $$$. But, if you have to install the 4.56s (don't find the axle you want with them already in there), it doesn't really matter if you do it now or later. The cost of installation will probably run you the same. With that in mind, you could run your 4.10s for a bit, save some cash, and see what you think.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  12. CaptCrunch

    CaptCrunch 1/2 ton status

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    I have 4.10's now w/ 35" MT's and a 700R4... definetly go 4.56's! I will be steping up shortly... just have to see if I have a 14B to regear for next to nothing or try and track down an open 14B w/ 4.56's

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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  13. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    With 35s a 700 you should be thinking about 4.88s not 4.10s unless you do a lot of highway driving. Then 4.56s would be ok. RPMs are your friend.

    Jim '80 GMC & '73 Blazer
    Body by Tellico
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  14. 6.2Blazer

    6.2Blazer 1/2 ton status

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    I didn't mention this on my first reply, but $650 seems pretty steep for a 12-bolt especially if you would have to pay extra for different gears. Prices are different depending on what part of the country you are in, but around here you can buy a good stock 12-bolt and then have it rebuilt with the gears you want for probably less than $650.
     
  15. delta9blazer

    delta9blazer 1/2 ton status

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    $650 is with 4.11's instead of 3.73's. and unless it was considerably cheaper, shipping would eat the savings.

    <font color=purple>delta9blazer</font color=purple>
     
  16. TXsizeK5

    TXsizeK5 1/2 ton status

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    4.11's and 4.56 were the same price at drivetrain warehouse, thats how i was enticed into buying 4.56. I Originally wanted 4.11's but whatever. I have Sm465 but i never drive highway except occasionally to the beach but its a little cold for that now, so by summer ill have bigger tires and cruisin rpms will be good for hihgway...
    for 650 dollars you can buy a 12 bolt with a 4.10 setup??? With install assuming you got a shop to do it? My gears and master install kits alone cost 399! Then install price is kicking my ass!

    6in 87' K5 w/ 35" BFG muds.
    305/Sm465/ NP208
    Kn filter and 4.56
    "Those who live by the sword get shot by those who don't"
     
  17. 79k20

    79k20 1/2 ton status

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    I have 35" tires with 4.11's and no OD. if i had OD i'd put in 4.88's or even 5.13's. i don't drive highway too much so what the hell.

    sean

    79 k20(duh) d44, 14bolt, built 350,350,np203,9"lift
     
  18. 1990K5

    1990K5 1/2 ton status

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    4.88's no question
     
  19. txbartman

    txbartman 1/2 ton status

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    I have heard that anything above 4.56s for a 10-bolt axle is playing with fire because the pinion gear gets really small. Since 12 bolts ring gears aren't much bigger than 10-bolts (3/8" bigger diameter), wouldn't the same hold true for 12 bolts? If so, I wouldn't push it above a 4.56 gear set.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  20. delta9blazer

    delta9blazer 1/2 ton status

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    well, the 650 is for a rebuilt 12b. they're normally 550, but they all have 3.73's. The yard that has them doesn't have 4.56, i'd have to buy the axle for 550, buy the gear set for whatever, and pay someone at least 100 to install, assuming the same place does it. they do have 4.11, but it doesn't sound like that's what i want.
    if'n i can't find a 12b with the gears already in it, i may stick with the 10b, and throw whatever i decide in there.
    anyone have decent junk yards close by, and would look for a set-up?

    <font color=purple>delta9blazer</font color=purple>
     

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