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Thread: HI+ rear diff question

  1. 06-12-2009 05:34 PM #1
    BigCountry
    BigCountry is offline Big Country
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    HI+ rear diff question

    hey guys, im new to the site, lots of good stuff on here!! i love what your all doing! and to whomever created this site; you, my friend.... are a god! lol
    so i know everyone loves to thrash on the guys with the 4.8L. i get it, screw you, but i get it. HAHA


    i guess i should start with a question straight off.

    rear end gearing.

    2001 silverado 4.8 300hp(ish)
    6 in lift on 35's and ill probly go bigger when i can afford it.

    im lookin for a decent balance between gas mileage and get-up-and-goability

    so my question is how tall of gears should i put in? its got the factory rear end with 342's and im swappin it all out for a eaton posi-locker with either 373 or 411 gears. any recomendations? am i even on the right track?
    Last edited by BigCountry; 06-12-2009 at 05:46 PM.
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  2. 06-12-2009 06:10 PM #2
    SLO TRUCK's Avatar
    SLO TRUCK
    SLO TRUCK is offline AKA Darth Vader
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    With the 35's i would for sure go atleast 4.10's.
    What have you done to the 4.8 to get it to 300ish?
    Name: Mark,
    God created turbo lag so nitrous trucks could have a chance.


    http://www.ls1truck.com/forums/my-ga...tml#post274877
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  3. 06-12-2009 08:52 PM #3
    rutroe's Avatar
    rutroe
    rutroe is offline Resident Pilot
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    Welcome to the site!

    07 Z71 4x4, 6.0L, 3.73s, Turbonetics T76 @ 10 psi, 75 shot, Snow meth kit, PLX DM-100 wideband gauge, Nelson tune, Comp 212/216 .557/.561 114 lsa, 60# injectors, Yank 3000, 4L80E , Magnaflow - dumped, e-cutout
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  4. 06-15-2009 02:16 PM #4
    tanz45's Avatar
    tanz45
    tanz45 is offline Throttle Jockey
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    4.8 in my truck with 35's.

    You're gonna want to do 4.56.

    Best prices I found, nationaldrivetrain.com

    Excellent turnaround time too.

    And Welcome
    2013 CC 5.3
    81 C10 LS1 project
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  5. 06-15-2009 02:28 PM #5
    Beatdown Z's Avatar
    Beatdown Z
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    With 35's, a 4.8, and planning to go up in tire size, definitely do 4.56's. I have 37's on my truck with a 6.0 and wish i had 4.88's.
    Big slow mud truck with a TUNE!!!!!!
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  6. 06-15-2009 02:42 PM #6
    TurboMic's Avatar
    TurboMic
    TurboMic is offline Senior Member
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    strong 4.8 there. Id say at least 4.56... from 3.42 to 3.73 or 4.10 is not worth the hassle of doing front and back.... guessing your 4x4... let us in on some info on your ride........nice first post....

    Quote Originally Posted by BigCountry View Post
    hey guys, im new to the site, lots of good stuff on here!! i love what your all doing! and to whomever created this site; you, my friend.... are a god! lol
    so i know everyone loves to thrash on the guys with the 4.8L. i get it, screw you, but i get it. HAHA


    i guess i should start with a question straight off.

    rear end gearing.

    2001 silverado 4.8 300hp(ish)
    6 in lift on 35's and ill probly go bigger when i can afford it.

    im lookin for a decent balance between gas mileage and get-up-and-goability

    so my question is how tall of gears should i put in? its got the factory rear end with 342's and im swappin it all out for a eaton posi-locker with either 373 or 411 gears. any recomendations? am i even on the right track?
    Last edited by TurboMic; 06-16-2009 at 04:09 PM.
    single digit street truck


    for build info

    http://www.ls1truck.com/forums/my-ga...cs-garage.html

    The best advice I have ever heard:... Only take B( . Y . )ST advice from someone that is CURRENTLY running a turbo setup close to, or bigger than what you want......
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  7. 06-16-2009 02:48 PM #7
    03chevytruck
    03chevytruck is offline Monroe Muscle
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    Welcome to ls1truck. What mods do you have?
    2003 RCSS Chevy 5.3L Fully Bolted, Cammed, Yanked, and 342s. Borla Exhaust w/ Electric Cutouts.
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  8. 06-16-2009 03:16 PM #8
    2k5Squirrel's Avatar
    2k5Squirrel
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    if you have 35's and plan on going larger i would go 4.88s, and welcome aboard
    NELSON PERFORMANCE
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