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Thread: Gears

  1. #1
    Sr. Mechanic larryleeUSN's Avatar
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    Now stationed in Mayport,Florida
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    Default Gears

    I have a 06 silverado. single cab, it has a leveling kit on top of a 6 inch suspension on top of a 3 inch body lift. so around 11 inches all together. im currently running 35's . i know to small for the amound of lift. but im going to be putting some 37's on when i get back from deployment. i still have my stock 3:42 gears in there from when i bought it. its not to bad on driving around anymore but i wanna get a lil bit of that power back like it was when i left the lot 3 years ago. i am having my family put it in the shop for me so its ready when i get back. i was thinking about running 4:56's but the guy at the shop is recomending 4:88's. everything i ever read suggest 4:56's. my truck is a 4.8 with an automatic tranny. the tire and wheel combo im looking at are some black pro-comp alloys with 37 inch X- terrains. any help would be greatly appreciated.

  2. #2
    Master Mechanic
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    Apr 2009
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    Owens Cross Roads, Alabama
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    Default

    in my opinion 4.56 should be fine.thats what id go with.then again with 11ins of lift and 37s 4.88 may not be a bad idea.sombody else may be able to help you a little more.i was running 38s with about 10"s of lift on my f250 with 4.56 gears and never had a problem
    -Dylan
    2004 Silverado 4x4
    4.8L
    1986 K5 Blazer
    8" Superlift w/39.5 super swampers
    1992 GMC Jimmy "Blue Bomber"
    4.3L Vortec

  3. #3
    Sr. Mechanic larryleeUSN's Avatar
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    Default

    thanks man. so your in the army or was in the army?

  4. #4
    Master Mechanic
    Join Date
    Apr 2009
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    Owens Cross Roads, Alabama
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    Default

    yea still am.ive been in for about 2 1/2 years
    -Dylan
    2004 Silverado 4x4
    4.8L
    1986 K5 Blazer
    8" Superlift w/39.5 super swampers
    1992 GMC Jimmy "Blue Bomber"
    4.3L Vortec

  5. #5

    Default

    4.56's are going to compensate real well for the tires up to 37's. Anything bigger then you should look at 4.88s but you'll probably get the improvement you want power wise with the 4.56s.

    -Greg

    The fool learns not from the wise man, but the wise man from the fool.

    2004 Silverado 4x4 (Suzie)
    6" Fabtech Suspension Lift
    35" NITTO Terra Grapplers
    18" MB Wheels Predators
    Thrush Turbo Series Mufflers
    on true dual exhaust
    Grille by Option Racing

    1952 3600
    Finally getting torn down to the frame.

  6. #6

    Default

    Quote Originally Posted by larryleeUSN View Post
    I have a 06 silverado. single cab, it has a leveling kit on top of a 6 inch suspension on top of a 3 inch body lift. so around 11 inches all together. im currently running 35's . i know to small for the amound of lift. but im going to be putting some 37's on when i get back from deployment. i still have my stock 3:42 gears in there from when i bought it. its not to bad on driving around anymore but i wanna get a lil bit of that power back like it was when i left the lot 3 years ago. i am having my family put it in the shop for me so its ready when i get back. i was thinking about running 4:56's but the guy at the shop is recomending 4:88's. everything i ever read suggest 4:56's. my truck is a 4.8 with an automatic tranny. the tire and wheel combo im looking at are some black pro-comp alloys with 37 inch X- terrains. any help would be greatly appreciated.
    4.88s are not only too low but also too weak. When you go that low in a small diff like you have the pinion gear ends up with 5 or 6 teeth. This becomes the weak point and if you do any serious off roading you will strip the teeth off the pinion gear.
    According to the charts going from a 31" tire to a 37" tire with a 3.42 axle you should change to 4.08. So a 4.10 is the recommended ratio and if you want a little more low end and a little less mileage 4.56 would be optimal.
    Here's a calculator if you want to check it out for yourself. Click Here
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  7. #7

    Default

    ya 4.56s are a good choice, my buddy runs 4.56s in his 02 sierra and its a good combo.

  8. #8

    Default

    Look, I have basically the same set-up as you. 4.56s are perfect for 35" tires. If you decide to go to 37s, go with the 4.88s. I have the 5.3L, 35s and 4.56s. They are perfect. You have the 4.8L, you should really consider 4.88s since you have a smaller engine. Think about the long run...35s & 4.56s would be ok. You go to 37s, you are going to be right back down to a doggish start like you have now with your 3.42s. Believe me, I lived it just like you have. 4.88s FTW.
    2005 Chevy Silverado Z71 in Black

    6" BDS Suspension Lift | 3" BDS Body Lift |17" Rock Crawler Stellies | 35" Cooper STTs | 4.56 Yukon Gears | AirAid CAI and TBS | Flowmaster 40s | HyperPAC Programmer


    2001 TJ Sahara in Sienna

    3.5" RE Suspension Lift | 33x12.50 Baja MTZs | D30/44 | ROKMEN Merc Front Bumper | Warn Rockcrawler Rear w/ Carrier | Warn M8000 Winch



  9. #9
    Jr. Apprentice drkbluZ71's Avatar
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    Feb 2009
    Location
    corpus christi, tx
    Posts
    27

    Default Question?

    i have an 07 Classic with a 5.3 with a Rancho Suspension lift and 35 in Super Swamper LTBs. if i was looking for better fuel milage would a 4.10 or a 4.56 gear ratio be more beneficial?

  10. #10

    Default

    Quote Originally Posted by drkbluZ71 View Post
    i have an 07 Classic with a 5.3 with a Rancho Suspension lift and 35 in Super Swamper LTBs. if i was looking for better fuel milage would a 4.10 or a 4.56 gear ratio be more beneficial?
    If you are looking for mileage only go with the 4.10 but you will probably be happier with the performance of the 4.56 gears with those big tires. 37" tires and gas mileage just don't mix very well. <G>
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

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