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373 or 410?

This is a discussion on 373 or 410? within the Drivetrain forums, part of the LSx Technical Help Section category; Well I want to change the gears in my car, I been wanting to for a long time just can't ...

  1. #1
    sick & twisted SS 02_slp_ss's Avatar
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    373 or 410?

    Well I want to change the gears in my car, I been wanting to for a long time just can't decide what I want lol, I been reading an 410 sounds good for track an red light to red light but I still like to drive my car on the interstate to! That's y I'm leading towards 373, can any1 help me with this lol also did any1 ever do the 390 gears how are they?

    My mods are

    Ms3 cam/ ported ls6 heads
    Long tubes full exhaust
    13lb fly wheel stage 3 clutch

  2. #2
    Member pewterz55's Avatar
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    majority of people are gonna say 373 for a4 cars and 410 for m6 so depending on your trans is what is going to be mentioned by almost everyone on here

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    since you indicate clutch in your mods,4.10s' and a future upgrade to a 12 bolt if you ever put sticky tires on that M6/4.10 combination(no,3.73s' would not decrease the 'breakability').

  4. #4
    None Shall Pass Knight's Avatar
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    Go 4.10s. That's what I run and at 65 mph I only turn around 1700 rpm or so. They really aren't that bad on the street.

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    sick & twisted SS 02_slp_ss's Avatar
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    plan on a 12 bolt here soon but I just want to swap gears now cuz my cam really don't like 65mph in 6 gear lol so every1 is say go with 410s?

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    Senior Member karpetcm's Avatar
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    4.10's for sure. Lots of people think 4.10's are bad on the highway and its not even close. Your running at low rpms regardless especially at 65-70mph and it will help you take advantage of that top end power you got, stay there longer and get there quicker.

  7. #7
    sick & twisted SS 02_slp_ss's Avatar
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    Ok yea I think ill go with 410s!

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by oldmanZ28 View Post
    since you indicate clutch in your mods,4.10s' and a future upgrade to a 12 bolt if you ever put sticky tires on that M6/4.10 combination(no,3.73s' would not decrease the 'breakability').
    im confused by your post so i dont know if this is even addressing what you said...but 4.10s will be a weaker in the sense of a 4.10s have a smaller pinion

    3.73s - 41 teeth on ring gear, 11 on pinion
    4.10s - 41 teeth on ring gear, 10 on pinion

    now this is all a moot point when referring to a 10 bolt..as stock gears will still shred and grenade everything.

    on 12 and 9" s this isnt a problem as the casing is much more resistant to flexing and distortion.

    yet another reason why putting anything into a 10 bolt besides fluid is a waste of money.

    if this isnt what you were saying then ignore my post

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    If you can do it cheap 410s are great, if not I'd save the $$$ for a new rear with the mods you have. I have taken a few highway trips and still get 26mpg, you can drive 80 all day long no problem. I drive my car almost everyday with a highway commute and again no problems.

  10. #10
    sick & twisted SS 02_slp_ss's Avatar
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    well i no im going to blow the rear apart just give me time lol, but i just want to do a gear swap for now.

  11. #11
    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by 02_slp_ss View Post
    well i no im going to blow the rear apart just give me time lol, but i just want to do a gear swap for now.
    lol well as long as you keep streets on ..you should be fine for a little bit.

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    Senior Member karpetcm's Avatar
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    I broke my old 01 SS M6 gears on street tires shifting from 2nd to 3rd, with lid, 4.10's, exhaust cut out and flowmaster. Pure dumb luck

  13. #13
    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by karpetcm View Post
    I broke my old 01 SS M6 gears on street tires shifting from 2nd to 3rd, with lid, 4.10's, exhaust cut out and flowmaster. Pure dumb luck
    the shifts create the most shock on the rear.

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    Senior Member karpetcm's Avatar
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    Your right^^^. I got cocky and gave a Vette a head start by one car, it happened to be a 02 Vette. I pulled right next to him top of 2nd gear and powershifted into 3rd. It wasnt immediate but i heard a weird noise, till i let off the gas and came to a slower speed it was a very obvious sound coming from the rear like metal in a container being spun hitting each other or slapping against the container sound its hard to describe and i felt sick to my stomach, lol. Now i shift lazy going into gears and stay away from powershifting.

  15. #15
    sick & twisted SS 02_slp_ss's Avatar
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    haha i slam gears! i get my hole body into it lol so like i said just give time! im going to the track sunday so i might bring my trailer so if i do get to crazy its ok lol

  16. #16
    Senior Member tatertot91's Avatar
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    Quote Originally Posted by 02_slp_ss View Post
    haha i slam gears! i get my hole body into it lol so like i said just give time! im going to the track sunday so i might bring my trailer so if i do get to crazy its ok lol
    Well i suggest you invest in a shifter though
    An aftermarket shifter like a pro 5.0 has stops to keep you from overshifting and messing up your tranny

  17. #17
    sick & twisted SS 02_slp_ss's Avatar
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    yep i got 1 thats the 1st thing i did to it

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by shady milkman View Post
    im confused by your post so i dont know if this is even addressing what you said...but 4.10s will be a weaker in the sense of a 4.10s have a smaller pinion

    3.73s - 41 teeth on ring gear, 11 on pinion
    4.10s - 41 teeth on ring gear, 10 on pinion

    now this is all a moot point when referring to a 10 bolt..as stock gears will still shred and grenade everything.

    on 12 and 9" s this isnt a problem as the casing is much more resistant to flexing and distortion.

    yet another reason why putting anything into a 10 bolt besides fluid is a waste of money.

    if this isnt what you were saying then ignore my post

    You are right Shady. Putting 4.10's in the 7.5 is a bad idea. With the small pinion of the 4.10,,,you only have 1 1/2 teeth contacting the ring gear at any given time. Very easy to shave the teeth off.
    It's just the nature of having a rear with such a small diameter ring gear.

    The 3.73's aren't much better either.

    If you plan track time, then the first chance you get, just spend the money on a 12 bolt or 9 inch and be done with it. Don't waste any time or money on that factory 7.5.

  19. #19
    Senior Member tatertot91's Avatar
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    Quote Originally Posted by 02_slp_ss View Post
    yep i got 1 thats the 1st thing i did to it
    cool

  20. #20
    Junior Member flotty's Avatar
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    Man i was wondering the same thing i have to have my rear end replaced and i was going to go 3:73 but i am going to go 4:10!

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