Re: [Chevelle-list] 12 bolt advice

Capt Crunch Sun, 28 Sep 2003 19:13:12 -0700

Clint... in STOCK configuration the 9" rears are weak. Most of the cases (all except the HD cases from some early 70's ranchero's, galxies, late 70's and early 80's F150, and torinos) tend to bend without a back prace. The non-nodular thirdmember cases are weak as well. Only a very select few "Drag Pack" packages had Nodular cases and the daytona pinion support. A 12B or D60 would be stronger is stock form. Now when you get into aftermarket stuff... then that makes a rather strong option with HD parts, but I have seen plenty of guys blow the caps right off em still depending on their combo and tire size. They then step up to either a D60 or larger Dana axle usually. I find most people run the (9" for one of four reasons... one cause they think they will have two thirdmembers setup and they will change gears often (most don't ever do this), to avoid the hassles of the c clip eliminators of a 12B, because they are made ready to drop into many applications (3rd gen camaro, a-bodys, G bodies, etc.) unlike a Dana 60, or simply cause they think everyone runs a 9".

Also you can tell the power difference on a chassis dyno. We have found it to be about 5-7%. This may be minor compared to some of the losses through other items (converter and tranny's are pretty considriable), but in the end every bit of power you loose in the drivetrain is a bit of power not put down to the track. In heads up racing that counts.

Overall there is nothing wrong with a stout aftermarket 9" by any means... It just isn't necesarrily the best choice for everyone.

Mikey

From: "Clint Hooper" <[EMAIL PROTECTED]>
Reply-To: The Chevelle Mailing List <[EMAIL PROTECTED]>
To: "The Chevelle Mailing List" <[EMAIL PROTECTED]>
Subject: Re: [Chevelle-list] 12 bolt advice
Date: Sun, 28 Sep 2003 19:43:23 -0500
I think you are exaggerating just a little,Mike. First,I really doubt that could tell the power difference between a 12 bolt and a Ford 9". Cost is pretty much a wash. And,everyone must want to run 9" rears because they are so weak. Yeah,right. Give me a break. Clint Hooper H&H Custom,owner LT5 Registry Director http://www.LT5Registry.net/ ACES #1650 http://dalesplace.com/misc/friends/clint_hooper.htm ----- Original Message ----- From: Capt Crunch

Well my number one turn off on it is the power loss due to the gear cut. Second is cost. You figure that the drop in case and axle package is about 800 dollars over here. Then keep in mind that a stock Ford 9 center section will not last long. The pinion support are very weak unless you find a very rare daytona support. The nodular cases are also very rare to find now... so that basically leaves you with an aftermarket center section to handle the power I plan to put down. That is gonna run between 1200 and 1600. Now who really wants to buy 2 of those so they can switch gears easily? LOL I pretty much have no choice really so I will just have to take the after market 9 and make more power to overcome the loss :)

IMO the 12b is a fine axle... better in stock form then a stock 9" in most applications. Just out of curiousity... why you getting rid of your 12b?

Mikey
    ----- Original Message -----
    From: Tigergutt
    Sent: Saturday, September 27, 2003 2:32 PM
    To: 'The Chevelle Mailing List'
    Subject: RE: [Chevelle-list] 12 bolt advice
Mikey,

I remember seeing posts about guys very happy with their 9” axles, its easier to change the gear ratio etc. I personally don’t do that very often, and I don’t think I would be doing it more often with a 9” axle, but its for sure nicer to work on a 9” than a heavy 12 bolt.

I think it was at moser you could get a drop in 12bolt with 9” axle bearings, that would eliminate the c-clip eliminators.

Med Vennlig Hilsen/Kind Regards/Cordiali Saluti

André Broe Jensen

-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Capt Crunch Sent: 27. september 2003 19:42 To: The Chevelle Mailing List Subject: Re: [Chevelle-list] 12 bolt advice

Sounds fair enough.... it is getting hard to find 12b's around here as well. If I could find one for cheap I would be all over it, but since they seem to be going for $500 plus for junk open diffs I will just get a drop in 9" rather then deal with the hassle of c-clip eliminators.

Mikey

----- Original Message -----

From: Tigergutt

Sent: Thursday, September 25, 2003 3:10 PM

To: 'The Chevelle Mailing List'

Subject: RE: [Chevelle-list] 12 bolt advice

Hi everyone,

I have taken out my gearbox and put it up for sale her in europe, next thing out (in about a month or so) is the 1968model 12bolt.

Anyone have an idea of how much a 3,73 completely rebuilt last summer is worth ? it have a gm posi and a Richmond gear setup, gm axles and fresh rear brakes (drums)it goes.

Personally I was shooting at around $1000/1200 because they are hard to find and worth more here in Europe than in the USA, but I really don’t know.

Thanks !

Med Vennlig Hilsen/Kind Regards/Cordiali Saluti

André Broe Jensen
      -----Original Message-----
      From: [EMAIL PROTECTED]
      [mailto:[EMAIL PROTECTED] On Behalf Of Pelle
      Andersson
      Sent: 25. september 2003 19:19
      To: Chevelle Mailing List
      Subject: [Chevelle-list] Thanks!
      The pix are streaming in so I might need some more time
      to get all you guys up on the site!
      In fact I might need the weekend!
      But I hope to get the first batch up tomorrow at this time!
      This I really good therapy since I can't do anything with my
      own car at the moment.
      My next project is a new starter & new
      rear coils & shock absorbers!
      ----------------------------------------------------------------
      http://members.chello.se/gearheads/
      Best regards
      Pelle Andersson

_________________________________________________________________ Get MSN 8 Dial-up Internet Service FREE for one month. Limited time offer-- sign up now! http://join.msn.com/?page=dept/dialup

Re: [Chevelle-list] 12 bolt advice

Reply via email to