Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Who's got 700R4 and 4.10's or 4.56's with 33's

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by tori89k5, Jan 2, 2002.

  1. tori89k5

    tori89k5 1/2 ton status

    Joined:
    Apr 12, 2001
    Posts:
    946
    Likes Received:
    0
    Location:
    Pismo Beach, California
    Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    Hey kids.... im gonna buy gears this week for the Blaze...
    Who out there has a truck with the 700R4. 33's and either 4.10 or 4.56 gears? I am undecided on which to get. Im afraid the 4.10 wont be enough RPM change and am afraid the 4.56 will be too much of a sacrafice of fuel economy and raise the R's too much. I have done the math, and am leaning toward the 4.56's LET ME HAVE YOUR 2 CENTS !!

    1990 K5 4" lift, 33's, 3.73's Raptor Tranny and Velvet Rides....
     
  2. Esteban86K5

    Esteban86K5 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    3,712
    Likes Received:
    0
    Location:
    Bakersfield, CA
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    33's, 700R4 and 4:10's worked great for me. I had enough power everywhere. It didn't downshift too much on the freeway and I could pull a trailer behind it with no worries. My RPM's where right around 2200 at 65.

    <font color=blue>It's easier to teach a child than to fix an adult.</font color=blue>

    <a target="_blank" href=http://community.webshots.com/user/geltyone>Webshots Pics.</a>
     
  3. GRINCH

    GRINCH 1/2 ton status

    Joined:
    Jan 30, 2001
    Posts:
    1,951
    Likes Received:
    0
    Location:
    Helena, MT
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    I have 4:10 gears and 33's with a 96 Vortec crate w/MPFI. I love the low end torque and can still cruise @ 75 around 3000 rpm. Although I have been having problems with edelbrock getting my chip right I get around 12 mpg in the city. The only complaint I have with the 700 is that when it shifts into OD @ 43MPH the engine realy feels like it lugging. I have some data scans that I can send you. Let me know how it turns out.



    <a target="_blank" href=http://coloradok5.com/gallery/90k5blaze>http://coloradok5.com/gallery/90k5blaze</a>
    The Few, The Proud, The K5 Blazer
     
  4. solowookie

    solowookie 1/2 ton status

    Joined:
    Mar 31, 2001
    Posts:
    3,880
    Likes Received:
    0
    Location:
    Wyoming
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    I'm running 4.10's with 33's and a 700r4... I wouldn't go more then 4.10's unless you will potentially be going to a larger tire in the future...

    if you go to <a target="_blank" href=http://www.4lo.com>4lo.com</a> you'll find a RPM calculator. I don't know where he's getting 3000 RPM's from cuz that is about the right RPM without OD...

    I'm running BFG 33x10.5x15 (they are really 31" tall) and my RPM is around 2400. if your 33's are really 33" tall you may consider the 4.56's.

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  5. 90K5

    90K5 1/2 ton status

    Joined:
    Jun 1, 2000
    Posts:
    3,719
    Likes Received:
    0
    Location:
    Lubbock, TX
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    Go for 4.10's if you don't like to go too fast - over 75 - I have 4.10s but wish I had 3.73's, it just tops out too quick for me. Also the speedo is way off. Everyone seems to think 4.10s and 33's are the perfect combo, but I really think 3.73's would be better, at least for me. I really like it around town though, at lower speeds.

    90K5
     
  6. tori89k5

    tori89k5 1/2 ton status

    Joined:
    Apr 12, 2001
    Posts:
    946
    Likes Received:
    0
    Location:
    Pismo Beach, California
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    Most of my driving is at HWY speeds... 70-80 mph the 3.73 are okay until i get to a hill, mountain,.. or am towing a load. If i can keep the R's up at those speeds its fine, but the slower i go, the slower it is... (kinda funny that way)[​IMG]
    I will be posting a ratio chart in a bit for everyone
    Maybe we should swap gears [​IMG]

    1990 K5 4" lift, 33's, 3.73's Raptor Tranny and Velvet Rides....
     
  7. solowookie

    solowookie 1/2 ton status

    Joined:
    Mar 31, 2001
    Posts:
    3,880
    Likes Received:
    0
    Location:
    Wyoming
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    about the only time that I would like 3.73's is when I'm towing, and I have to stay in Drive...

    a lot of vehicles have the 4 speeds with one of those being low gear, and don't have an OD. yet they run much higher RPM's then you'd be running with 4.10's and 33's ALL THE TIME... (and with no problems)

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  8. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    I don't think you're going to notice a significant difference going from 3.73 to 4.10.

    I wouldn't make a gear change of less than 1/2 of a point with an auto trans.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  9. Wheels

    Wheels 1/2 ton status

    Joined:
    Aug 18, 2000
    Posts:
    638
    Likes Received:
    0
    Location:
    Native Floridian living in Oklahoma, USA
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    4.11, 33's with 700R4 in a 79 and it works great. It turns 2250 rpm at 70 and 2500 rpm at 80 (with the torque convertor lock-up engaged). Gas mileage is 13.5 mpg at high way cruise speeds. It does shift into OD at 44 mph but I leave it in D when driving 50 MPH or less. It doesn't shift in and out of OD in the rolling hills of Oklahoma and tows an 18' 9" bass boat with ease.
     
  10. bigjbear

    bigjbear 1 ton status Staff Member Moderator

    Joined:
    Feb 18, 2000
    Posts:
    13,973
    Likes Received:
    453
    Location:
    Marietta GA
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    3.73s with 33s and O/D? No way! I have 3.73s with the 29" tall tires on my wife's Jeep (318 and O/D trans). I would go with the 4.10 if spend a lot of time in "drive" pulling a trailer, otherwise go with the 4.56. Of course this assumes your 33s are 33" tall. You need to measure and make sure.

    Jim '80 GMC & '73 Blazer
    Body by Tellico
    <a target="_blank" href=http://www.tellicok5.rockcrawler.com>www.tellicok5.rockcrawler.com</a>
     
  11. Philly87

    Philly87 1/2 ton status

    Joined:
    Jul 14, 2000
    Posts:
    465
    Likes Received:
    6
    Location:
    El Paso, TX
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    I love my 4.10 and 33's. Plenty of grunt down low on the street or in 4 Low and nice on the freeway.

    Philip
     
  12. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

    Joined:
    Jan 21, 2001
    Posts:
    20,716
    Likes Received:
    2
    Location:
    Undisclosed Location
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    I'm running 3.73 on 33's. I can pull 15-16 at 70-75 and almost 18 mpg at around 65. On the flats, it cruises right along, but when I hit the hills, it sucks. I've got to change the frontend this spring and I have been thinking about dropping the gearing all around to 4.10 to help with the hills since I may spend some significant time in the late summer in the mountains.

    Bubba Ray Boudreaux,
    Official Colorado K5.com Fantasy Football Choke Artist!<a target="_blank" href=http://community.webshots.com/user/mdntrdr1>http://community.webshots.com/user/mdntrdr1</a>
     
  13. muddin4fun

    muddin4fun 3/4 ton status

    Joined:
    Feb 19, 2001
    Posts:
    5,644
    Likes Received:
    0
    Location:
    N Texas
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    do you want to leave some growing room for 35's or anything?


    <font color=blue>Answers: $1, Short: $5, Correct: $25, dumb looks are still free.</font color=blue>

    <a target="_blank" href=http://www.bluefox.tv/~lara>My Wonderful Site</a>
     
  14. 6.2Blazer

    6.2Blazer 1/2 ton status

    Joined:
    Feb 24, 2000
    Posts:
    4,675
    Likes Received:
    26
    Location:
    Ohio
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    I went from 3.73's to 4.10's several years ago in my '90 with 33" tires. Honestly, I couldn't really tell any difference between the two. I do think that the 4.10's and 33's work good together, it's just that your current 3.73's are not THAT bad and you might be disappointed with 4.10's if you are expecting a big difference in performance.
     
  15. txbartman

    txbartman 1/2 ton status

    Joined:
    Jun 1, 2001
    Posts:
    1,975
    Likes Received:
    0
    Location:
    Plano, TX
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    While 4.10s and 33s might give you some improvement (but maybe not noticeable), you may not be satisfied based on the cost associated with the swap. I would seriously plan out what you are going to do with this rig in the future. If you plan to EVER go bigger, I would either stick with the 3.73s and go to 4.56s when you go bigger, or go 4.56 now and bear with it until you get the bigger tires.

    It would suck to spend the money now, not be too terribly satisfied with the difference (not saying that 4.10s are bad with 33s, just that the difference form 3.73s may not be that big of a deal), and then pay again for 4.56s with bigger shoes later.

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

    Leadfoot 1/2 ton status Premium Member

    Joined:
    Nov 28, 2000
    Posts:
    3,112
    Likes Received:
    1
    Location:
    Western Massachusetts
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    I agree with Brian, although my gut feeling is to lean toward the 4.56's now. You seem to want a difference in gearing (otherwise you would PROBABLY not be asking this question). As stated the 4.10's would be a good match for 33's (which usually aren't a true 33"'s tall). But you won't notice that much difference from your current 3.73's. I have 4.56's, 700r4, 33's and love it. GREAT acceleration and can travel down the highway and not be pushing too much RPM's in OD at 80. Granted you may see a slight decrease in highway MPG, but you will see an increase in around town driving as you don't need to hit the gas as much to get moving. If you live near somebody with 4.56's (or close to it) and ~33's equipped rig, whether it be GM, Ford, Dodge, etc. you may want to take it for a spin to see. Or if you can find somebody with 4.10's (or close) with ~33's you will be able to get an idea if you will notice a big difference in rpms.
    The only drawback is that it is a fairly pricey and timely (if you decide to do it yourself) endeavor so make sure before you buy.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  17. solowookie

    solowookie 1/2 ton status

    Joined:
    Mar 31, 2001
    Posts:
    3,880
    Likes Received:
    0
    Location:
    Wyoming
    Re: Who\'s got 700R4 and 4.10\'s or 4.56\'s with 33\'s

    yea you have to realize that most 33's aren't really 33" tall. my BFG 33's are really 31's, and the combo is great. I'd say if your tires are really 33's then you could go to 4.56's without much problems. (and otherwise save your $$$)

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     

Share This Page