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9inch 4.56

This is a discussion on 9inch 4.56 within the Drivetrain forums, part of the LSx Technical Help Section category; I am about to buy new gears for my 12 bolt and can not decide between 4.11 or 4.30's. Jay,I ...

  1. #21
    Veteran Hi-Po's Avatar
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    I am about to buy new gears for my 12 bolt and can not decide between 4.11 or 4.30's. Jay,I always see you praising the 4.30's... Im coming from 3.73 in my M6 so even 4.10's will be a huge jumpo. I just cant help but think the 4.30's will be too much. My TA is driven on the street.. ALOT. Way more than down the track. 4.30's too much for the street?

  2. #22
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Hi-Po View Post
    I am about to buy new gears for my 12 bolt and can not decide between 4.11 or 4.30's. Jay,I always see you praising the 4.30's... Im coming from 3.73 in my M6 so even 4.10's will be a huge jumpo. I just cant help but think the 4.30's will be too much. My TA is driven on the street.. ALOT. Way more than down the track. 4.30's too much for the street?
    There were many 6 speed cars that went with 4.30's that I was aware of when living in Ohio. To go from a 3.73 to a 4.10 isn't a huge jump, it's noticable but it won't set the world on fire.

    I drove a couple of 6 speed cars that I did 4.30's for and I feel it's better suited to a high strung little 346. Especially if you run any kind of decent tire at the track.
    Fact is even a cam only in a little 346 will spin 6500 no problem, sometimes even more. A high strung engine like that will love alot of gear. If you couple that to a 28 inch tall sticky tire you'll need the 4.30's or more if you are looking for best track times.
    Even on the street if you stick to the stock 26 inch tall tire height the 4.30's are still very livable with a 6 speed and that .50 overdrive.

    I personally wouldn't think twice about it so long as you keep the car naturally aspirated.

  3. #23
    2 SS's are better than 1 Jays00ss's Avatar
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    Daily drive mine in the summer time with the 4.30's. absolutely love them on the street. Still can get 23-25 mpg if I can keep my foot out of it. 75 MPH in 6th on the hiway I am at around 1950-2000 rpm.

    Like I said before I am right in the sweet spot at the track with 26.5" MT ET Streets. I have my rev limiter set at 6900 RPM and in 4th I am at the line at around 6550.

    Like firebirdjones said if you stay N/A. I wouldn't hesitate at all to get the 4.30's. If you plan on some silly gas or superchargeing, a lower gear might be better for you.
    Last edited by Jays00ss; 02-04-2009 at 04:48 PM.
    2000 SS Camaro Heads, Large cam, Fast 90, 9"w/430's and locker, yada yada yada... you get the picture

    1971 SS ElCamino 402 Big Block 550HP

    2006 Silverado 2500HD 496 cubic inches of pure muscle

  4. #24
    Veteran Hi-Po's Avatar
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    Dont ever really plan on the juice. Definitely not SC or TC.

    So you think 4.30 gears for my Daily Driven TA will be good? I wont regret it? Never rode in a 4.30 geared car before. Whats to expect for DD-ability over 4.11 to 4.30? What is the major difference in DDing? Any downsides to 4.30 over 4.11?

    Just trying to make the right choice the first time. Do not want to set up the gears twice.

  5. #25
    2 SS's are better than 1 Jays00ss's Avatar
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    You are looking at an approx 50-75 rpm difference.

    I had 3.90's in my 10 bolt. Highly disapointed in them. I said F it and went with 4.30's in my 9" and so glad I did. It's all up to you. I absolutely love them for MY SET UP. My tuner told me when he was driveing my car that the gears made my car for the cam I run.

    For me, I have a decent job, gas milage isn't a real big concern for me and the extra little "seat in my pants" feeling is well worth loseing 2 MPG.

    I am just 1 guy that has been around muscle cars most of my life and have had over 20 of them. This 6 speed in the new gen is awesome. Shit I had 4.10's with an old 70 SS Nova big block car with a th-400 (3 speed auto) so I am a big fan of the higher gearing and it works well with the small block, cam and 6 speed.

  6. #26
    Slow'er'Ass Mr. Luos's Avatar
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    Trade you my 4.11's (for the 9") for your 4.56's.

  7. #27
    2 SS's are better than 1 Jays00ss's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    Trade you my 4.11's (for the 9") for your 4.56's.
    Still trying to get those gears huh? LOL. I think 4.56 in your car would be A WHOLE LOT OF FUN!!!!

  8. #28
    Moderator Firebirdjones's Avatar
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    I'd do it Hi-Po. Shucks I'm old school and still have 3 and 4-speed cars with 4.56's and even one with 4.88's and no overdrives.

    I still bang around in those cars without thinking twice about road trips.

    So I don't even blink at sticking 4.30's in a car that has 2 overdrives in it

  9. #29
    Senior Member Bottesini's Avatar
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    For highway driving with stock height tires I would have preferred 3.90s. This is mostly because I want to run around 80 on the interstate (which the car spends alot of time on). With the 4.11s I tend to go around 75 and turn 2100 RPM.

    Have not gotten it to run a quarter mile, but in the eighth I am just at the top of 3rd gear with my street tires. When I put in the new motor I might have to run a shorter gear, almost certain if I put the bottle on top of that.

  10. #30
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Bottesini View Post
    For highway driving with stock height tires I would have preferred 3.90s. This is mostly because I want to run around 80 on the interstate (which the car spends alot of time on). With the 4.11s I tend to go around 75 and turn 2100 RPM.

    Have not gotten it to run a quarter mile, but in the eighth I am just at the top of 3rd gear with my street tires. When I put in the new motor I might have to run a shorter gear, almost certain if I put the bottle on top of that.
    2100 rpm??? It's hardly breaking a sweat. I buzz down the highway in the old iron at least 3500 rpm or more

    You yougin's have really gotten spoiled with all this overdrive stuff.

  11. #31
    Senior Member Bottesini's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    2100 rpm??? It's hardly breaking a sweat. I buzz down the highway in the old iron at least 3500 rpm or more

    You yougin's have really gotten spoiled with all this overdrive stuff.

    Well considering with stock gearing that is the same as running 90. I like my modern toys. Could not have an old school hot rod and use it for a daily practically with how much I use the car. For me with the true duals and all the other mods 2100 is the happy place for the Camaro. Ideally for me I would rather run a slightly taller tire or just a little less gear for the highway. On the street there is no problem what so ever, just use a higher gear and it is just the same as it was when it was stock (but more fun ).

  12. #32
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    Quote Originally Posted by Jays00ss View Post
    Still trying to get those gears huh? LOL. I think 4.56 in your car would be A WHOLE LOT OF FUN!!!!
    I will probably just order them and sell off the 4.11's in April.


    Thinking about picking up a set of 3.50's as well...for road trips off the mountain.

  13. #33
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    I would love to try 4:56s and I am boosted! I just recently sold the 4.10 (10 bolt) and temporarily swapped in my other 3.46 10 bolt and now she practically falls on her face! Its a PITA to keep it into boost. Next week I will have my Strange 12 bolt into place but still w/ 4.10s. I think the 4.56s would really be beneficial in the bottom of third and definitly in 4th. 1st and 2nd would require a really sticky tire! I drive my car everyday in all kinds of weather so for now the 4.10s will have to do.
    Last edited by 9t8z28; 02-05-2009 at 04:43 AM.

  14. #34
    Veteran Hi-Po's Avatar
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    Well, I ordered the 236/240 and tomorrow I am ordering my 4.30 gears and install kit.


    Hoping for the best.

  15. #35
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Hi-Po View Post
    Well, I ordered the 236/240 and tomorrow I am ordering my 4.30 gears and install kit.


    Hoping for the best.
    Way to go man,,,I just hope that camshaft works out for ya.

    Since it's ground with 114 lobe sep and 4 degrees of advance only puts it at 110 intake center line,,,that gives you more wiggle room on the intake valve clearance.

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