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Who has MWC 9"?

This is a discussion on Who has MWC 9"? within the Drivetrain forums, part of the LSx Technical Help Section category; im just going off what bberretta had.. why is it wrong if he has one?...

  1. #21
    Impounded
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    im just going off what bberretta had..
    why is it wrong if he has one?

  2. #22
    Moderator 35th-ANV-SS's Avatar
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    Red
    02 35th LE Camaro SS

    My question was for him

  3. #23
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    hmm. well is it like for drag applications or something?

  4. #24
    Member bberretta's Avatar
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    Bright Red
    2000 TA Firehawk 0041/742

    Backbrace is really for higher HP applications, but I really like the way they look as well. Plus, the way their's is set up, the backbrace is welded on so if you don't do it when it's built, you can't do it. If you plan on building big like I do plan on going, it's good to go ahead and get the backbrace.

    As for the center, the aluminum center will help get the weight down (a 9" is heavier than the stock 10 bolt) but I've installed three different 9" rears (two in '55 Chevy's, the one in my 'Hawk and we have one for a '69 Camaro to be installed next summer or so) and used the nodular iron centers in all of them with no problems. Some of the options are personal preference- whether it be the aluminum center or the backbrace.
    2000 Pontiac Firehawk #0041 of 742

  5. #25
    Moderator 35th-ANV-SS's Avatar
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    Red
    02 35th LE Camaro SS

    A backbrace is welded onto the housing to strengthen if you plan on running very high horsepower numbers.

    When you get below like 1.5X 60' times, people want the backbrace so the housing doesn't twist.

    I think for anything under 600HP it is overkill. I don't plan on cutting 1.4X 60' times on mine so I didn't get it.

    You also can chance having the housing warp from the weld if it isn't done properly.

  6. #26
    Moderator 35th-ANV-SS's Avatar
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    Red
    02 35th LE Camaro SS

    Beat me to it!

  7. #27
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    hmm. what about for a bolt on 427 that could possibly be boosted or heads/small cam?
    and should i go with aluminum since im heavy as it is?
    i mean lighter = better acceleration, gas, 1/4 mile times right?

  8. #28
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by BashamWS6 View Post
    hmm. what about for a bolt on 427 that could possibly be boosted or heads/small cam?
    I've heard about one twisting before...he was cutting a 1.2X 60' time and was running 1000HP.

    If you want to be EXTRA safe, get it. I didn't feel the need for one.

  9. #29
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    well...might as well not cut an corners...lol

  10. #30
    Member bberretta's Avatar
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    Bright Red
    2000 TA Firehawk 0041/742

    Like I said, personal preference. The 9" is WAY sturdier than that 10-bolt ever thought of being- with or without the backbrace! I think I saw something like the aluminum center saved you 15 pounds and brings the 9" back closer to 10-bolt weight. Honestly, I didn't see the benefit in saving 15 pounds- hell, I need to lose 30 pounds...

  11. #31
    Member zmg00camaross's Avatar
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    pewter
    2000 camaro ss

    Eric at MWC recommends a backbrace at about 550RWP just to play it safe, Myself drag race mine and launch at 6k+ off the 2 step and dump it, only pulling 1.6 60s but will improve, But will agree it looks cool lol. but also I seen where he builds them on the jig and like berretta said once this rear is made that is it, So for the 125 or 150 bucks you mite as well play it safe. That is just my opionion. But if you do need to save some money and dont plan on drag raceing and just run on the street the NA backbraced probly be fine.
    Last edited by zmg00camaross; 12-21-2010 at 10:04 PM.

  12. #32
    Member herculesrider1's Avatar
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    '00 TransAm RamAir WS6 M6

    Quote Originally Posted by 35th-ANV-SS View Post
    Just so you know, the clearance with the torque arm and the floor pan of your car is non-existent when you have a 9" rear end.

    You WILL need to massage the floor pan of your car to create your own clearance between the torque arm and underside of the car.
    Ah hah, that is why it sounds like my rearend is going to fall out from underneath my car every time I hit a bump. How much 'massageing' is needed???

  13. #33
    Member bberretta's Avatar
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    Bright Red
    2000 TA Firehawk 0041/742

    Mine doesn't have any clearance issues but I also don't have it lowered. Also, I installed poly bump-stops which hit pretty hard.

  14. #34
    Moderator 35th-ANV-SS's Avatar
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    Red
    02 35th LE Camaro SS

    You're just going to have to crawl under there and see where it is hitting and get to pounding

    I'm lowered on Stranos so mine got a little too close for comfort.

  15. #35
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    Red
    '00 TransAm RamAir WS6 M6

    Well, I'm lowered on Eibachs, so, the effects are most likely the same. I'll have to look under and make adjustments if necessary. Thanks!

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