in the spring i'll be looking for a good 12 bolt rear for my camaro.
i need one with clean axle tubes (no brackets on them) as i will be using ladder bars and coil-overs and i fabricate my own brackets, and weld them on my self.
i want a 3.73 gear and an eaton posi unit in it.
if you guys know of anyone who sells used ones that fit 67 Camaros i'd also be interested.
i dont want to spend a fortune on a Moser or Currie rear if i dont have too, but i want something that'll hold up to a torquey big block if i get one. (i'm still looking for big blocks even though i'm planning on building a Small block (since i have the block and crank).

I would think that a way to get a good 12 bolt core would be to find an old big car with one under it and have the rear cut down the way you want it b/c if I am not mistaken, old 12 bolts cost an arm and a leg that fit the first gen. cars!! pdq67

lol, i guess you cant get something for nothing.
if i cut it down i need new axles though, and that'd cost a bit!
i'm reminded somehow of something a friend said recently. he was looking at the rear of me car and says "i have a 12 bolt that would fit right in there, but i dont let 12 bolts go". http://www.camaros.net/forum/frown.gif

The used 12 bolts for first generation Camaros are very, very hard to find now and when you do find one, they are expensive! A used rearend will cost over $500, then you will have to spend another 600-700 for parts to rebuilt it. Moser Engineering sells new 12 bolts. The problem I've seen with the used rearends is the axel tubes are not straight. They get bent from either welding wrong or they are wreaked.
Moser is you best choice for a high quality 12 bolt. Here is a link to their wedsite: http://www.moserengineering.com/Default.htm

I sugest finding a 12 bolt from a Impalla and have it cut to fit your car. I'm building one for a '69 using a Impalla core and putting Moser ends on it that take the 9" Ford axle bearings to eliminate the C clips and increase the load carring ability of the axles. This is really the best way to go. You have to have special axles to use the Ford bearings anyway and you will have a much stronger rear end. While you are at it you could also upgrade to the 33 spline axles and Eaton posi. Yea, it is expensive, but you won't have to worry about it anymore. You could even alter the width of the rear end to fit wheels with a different back spacing. Please don't cut up a good Camaro 12 bolt when they are so hard to find, and you would be better off with the other one anyway.

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'69 RS/SS396 pro street
427/4spd/9"
Byars Performance
High Performance Drive Train Parts And Service
www.lubedealer.com/biggearhead (http://www.lubedealer.com/biggearhead)

http://www.camaros.net/forum/frown.gif i guess thats what i'll have to do, or i'll build up my 10 bolt, and worry about it. finding a BBC isnt looking to good ethier, so i wont have much to worry about. a streetable small block wont have enough torque to kill a ten bolt.

I hate to say it, but why not use a ford 9" ?



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69 Camaro Z28 "clone" - 327 AT
"461" camel back heads,
edelbrock, hooker, ultradyne,
TRW etc.
700R4 TPI transmission

can they be had cheaper then a 12 bolt? are they lighter? can i use a posi rear in them? i really dont want a Ford part in my chevy, but if its that much better i'll consider it, and cheaper too.

I am definately not an expert, but I do know that the Ford 9" is probably the strongest and most common rear in all motorsports. Another thing that I really like (and most racers) is the removeable third member housing that makes gear changes easy. Posi units and numerous gears are available at reasonable prices. I have also found this web-site that may be of interest to you. http://www.rearman.com/index.html

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69 Camaro Z28 "clone" - 327 AT
"461" camel back heads,
edelbrock, hooker, ultradyne,
TRW etc.
700R4 TPI transmission

Heck, I bought the new Mustang "Bullitt" wheels and had all my stuff redrilled b/c I like the looks of them, so Ford part stuff really doesn't hold water. IMHO.

The real reason to me to keep a 12 bolt under my car is that from what I have read, the way the gears are cut make them a couple of percent more eff. than the 9" rear for max. power tranfer eff.!! pdq67

TJ, thanks for the link.
i only need a rear capable of handling the power that a stout SBC or BBC will put out, i dont need a top of the line, bullet proof quick change rear.
the ratio that i choose to buy with the rear and posi unit will probably stay in there, so i doubt i'll need a quick change rear. even so, i thought 12 bolts had a removable pumpkin so you could change gears quick?

No, a 12-bolt is just like a 10-bolt. A Ford 9" has the removable type pumpkin but it is not a quick-change. Even in NASCAR Winston Cup the Chevy's, Pontiac's, and Dodge's run a Ford 9" rear - so when they make a change in gear ratios they only have to change the third members. (pumpkin assembly) If you go to the trouble of installing a 4-link or coil over rear, I would highly recomend a Ford 9". Also if you are worried about driveshaft yokes, they make dual size u-jointts to bolt a Chevy to a Ford etc.

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69 Camaro Z28 "clone" - 327 AT
"461" camel back heads,
edelbrock, hooker, ultradyne,
TRW etc.
700R4 TPI transmission

Ford had so many yokes for the 9" that they actually made one that fits the Chevy drive shaft without changing anything. I have one on the 9" in my '69. The Ford Traction Lock (posi) isn't very strong, but there are others available that are stronger. I have the Detroit Locker in mine. You can build the 9" any way you want it. There is no other rear end with as many parts available for it. It is a little heavier than a 12 bolt and does take just a little more power to turn, but there are no C clips to worry about and many other benifits to offset the weight and power loss.

------------------
'69 RS/SS396 pro street
427/4spd/9"
Byars Performance
High Performance Drive Train Parts And Service
www.lubedealer.com/biggearhead (http://www.lubedealer.com/biggearhead)

i dont really need it to be a quick change. so that doesnt matter to me. i'll see how much both of them cost and thats what i'll go by.
thanks guys for the advice http://www.camaros.net/forum/biggrin.gif

CNC,

If you are looking for a big block core, look up one of the engine core suppliers in your area. Their customers are generally the companies that sell rebuilt engines. You may be able to go by one of the rebuilding shops and get the name of their core supplier.

We have a core supplier here in Dallas and they generally have 5-10 396s and 454s at any given time. They sell rebuildable long block cores for $300. Contrary to what others have said on this site, neither engine is particularly rare.

thanks for the advice, i've been planning on building a small block, but if i find a nice built BBC short,long block or complete engine i'd rather go foe that, so save some money and have a nice big block. i cant afford to build one from scratch.

heres a fallow up, i received a price from moser today $1925 for a 12 bolt rear that'll fit my car with an 30 spline eaton posi unit, and gear of my choice, with some special alloy axles, that DON'T have C-clips, they have some sort of retainer or eliminator, and a high performance aluminum cover. Thats a pretty good price, better then i expected.

Go with the Moser. I have had good luck with the equipment and with the people. the money doesn't sound bad for a rear end that is complete and already set up. They are also pretty good about taking care of you if you manage to tear it up. I know.

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SCOTT
69 RS-SS 396 4-SPEED

gheatly,

You have mail. pdq67

Scott, thats good to hear, i hope i dont break it, but its good to know they'll be easy on the repair costs.

If your gonnaa spend all that money anyway, why not go with an equivalent 9" rear end?? They are cheaper and much more durable than a 12 bolt. Unless you need it to look "stock", I would consider the 9". I'm guessing that once you add the ladder bar rear, it's not gonna look too stock anymore anyway!!



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Paul D.

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68RS, 331, 10.5:1, 4spd, 3.90 9", lowered, 245-45-16's all 'round

a 12 bolt is a GM part, fits correctly with my driveshaft and other parts and will hold up fine, its also lighter. i will consider and thats for the advice, it'll probably be detirmined by price mainly.
i'm going with ladder bars and some nice shiney coil overs so it wont look stock, i dont care about that.

Call 909.940.0515 Saturdays only 32 12 bolts for 67-69 to chose from.

thanks tracy, i hope they'll have them in the spring though, cuase i dont have the money for a new rear now.