12 bolt rear ends?

I researched a 12 bot vs a 9" and the 12 came out better, some article
in chevy high performance or some other zine. The 12 takes less power
to turn than the 9". Stock parts can handle 500 hp and said the parts
are some what cheap. All in all they are about the same.
 >> Stay informed about: 12 bolt rear ends? 

marty <slammedf150.RemoveThis@aol.com> wrote in article
<1141000715.783528.88860.RemoveThis@t39g2000cwt.googlegroups.com>...
> I researched a 12 bot vs a 9" and the 12 came out better, some article
> in chevy high performance or some other zine. The 12 takes less power
> to turn than the 9". Stock parts can handle 500 hp and said the parts
> are some what cheap. All in all they are about the same.
>
>

There are many, many more nine-inch Ford rears being used in professional
racing than 12-bolt Chevies......
 >> Stay informed about: 12 bolt rear ends? 

actually most of what I see light truck rearends are narrower than car
rearends anywhere from 1"-2" on average ,for one trick to do for a
4wheel drive s-10 to even out the wider front compared to the narrower
rear ,is to switch out the rear with a camaro rearend (have to switch
suspension mounts around but it gives a nicer stance since the camaro
and S-10 is basically the same rearend just different width)
 >> Stay informed about: 12 bolt rear ends? 

I have a c10 1/2 ton 2wd. I have read were you can make a bullet proof
10 bolt, can post link if intersted. For around 400 so I will try this
for now and see how it goes. It will never see over 600 hp so I think
it will handle up. I have the stock 2.73 when I gear to 3.55 or 3.73 do
I have to change covers or will the stock hold bigger gears?
 >> Stay informed about: 12 bolt rear ends? 

you shouldn't have to ,but go with the 3.73's I have those in my S-10
and they run nice and take off is great and the fuel mileage is not too
bad either
good luck
 >> Stay informed about: 12 bolt rear ends? 

Do you still have lots of high end on 3.73. Thats why I want 3.55 so I
can go fast, since I have a th 350.
 >> Stay informed about: 12 bolt rear ends? 

let me put it this way when I was going thru south carolina a few years
back ,you can cruise on the interstate at 85 I had hit 95 heading to 100
without realizing it in 5th gear (long night of driving)and I was amazed
that it didn't take no effort to accelerate in fifth at those speeds
,that is where the lower ratio in the rears come into their own you can
still pull in fifth gear,I have driven vehicles with 2.90-3.20 gears and
I couldn't pull like that without dropping it down into 4th and
sometimes 3rd which actually cooks the engine pretty good ,but 3.50's
are not bad gears you just have to see what suits you and see what type
of driving you actually need to do ,a good idea is to hit the drag
strips and car shows to see what gears they are running and see what
catches your fancy.
Theres also an affordable way to increase your gear ratio without
breaking the bank ,years ago when the guys built lead sleds they would
attache a second transmission behind the first ,that way they could drop
both trannys into first and cruise all night at idle and if you were out
on a drive you can get good cruising speed up then switch it up to the
higher gear on the second and cruise while saving your gas for a longer
distance to drive,think of it as a poor mans over under drive (if you
have 2 4 speeds hooked up you get 16 forward speeds and 4 reverse speeds
,but if you hook up a 4 speed to a 5 speed you get a 20 speed forward
and 4 reverse and 2 5's get 25 forward and 5 reverse)
for a full size truck this can be a big bonus and you need a long enough
drivetrain that is in proper alignment to the rear out side of that I
wish you good luck
 >> Stay informed about: 12 bolt rear ends? 

F150-XLT 9" Rear, 3.73 gears, 2500lb overload springs, AUBURN limited slip,
31" tall 11.5" wide tires, 4 speed automatic (E40D I believe).

Cruises 70 MPH at about 1950 RPM, drops out of OD and pulls anything up
hills including a 35' trailer.

Had 4 F150 XLT's so far in my lifetime, put 3.73 with auburn limited slip
(one came that way & one was a 4x4) in every one. Works great.

Tex


"badaztek" <badaztek.RemoveThis@webtv.net> wrote in message
news:18471-440FBF1D-146@storefull-3218.bay.webtv.net...
> let me put it this way when I was going thru south carolina a few years
> back ,you can cruise on the interstate at 85 I had hit 95 heading to 100
> without realizing it in 5th gear (long night of driving)and I was amazed
> that it didn't take no effort to accelerate in fifth at those speeds
> ,that is where the lower ratio in the rears come into their own you can
> still pull in fifth gear,I have driven vehicles with 2.90-3.20 gears and
> I couldn't pull like that without dropping it down into 4th and
> sometimes 3rd which actually cooks the engine pretty good ,but 3.50's
> are not bad gears you just have to see what suits you and see what type
> of driving you actually need to do ,a good idea is to hit the drag
> strips and car shows to see what gears they are running and see what
> catches your fancy.
 >> Stay informed about: 12 bolt rear ends? 

RSCamaro wrote:
> On 26 Feb 2006 08:36:50 -0800, "marty" <slammedf150.DeleteThis@aol.com> wrote:
>
> >I currently have a 10 bolt and want to go to a 12 bolt to handle my
> >power. I have a 85 c10 1/2 ton 2wd. So I am going to go check out some
> >junk yards. Would a cars rear end fit or is it shorter in width? What
> >cars had a 12 bolt rear end? I am going to gear it to 3.55 or 3.73 and
> >put a posi. I know some cars had posi stock. If you can point me in the
> >right direction I would apriciate the help.
>
> Blazers are what you want to look for. Late 70's to early 80's 4
> wheel drive Chevy/GMC trucks had 12 bolts in them. Just so you know,
> a 8.5" 10 bolt is nearly as strong as the 8.75" 12 bolt rear and
> cheaper to buy and rebuild. Do a search about the strengths and
> weakness' of the 2 rears. A Ford 9" is also another choice that can
> be less expensive than the 12 bolt.
>
> ...Ron

I don't think a 4WD is the best choice for him as those probably have 6
lug wheels and I think the 2WD pickups had 5 lug wheels back then. So
he probably wants to look for a 70's pickup with a 12 bolt; ISTR that
my dad's '73 had a 12 bolt posi in it but it has been so long since I
looked under it that I may be mistaken.

Also the Ford 9" if it is from a passenger car will probably have a 5
on 4-1/2" bolt pattern... also not good. I think a Chevy truck would
be 5 on 5"

nate
 >> Stay informed about: 12 bolt rear ends? 

On 10 Mar 2006 11:38:25 -0800, "N8N" <njnagel.TakeThisOut@hotmail.com> wrote:


>I don't think a 4WD is the best choice for him as those probably have 6
>lug wheels and I think the 2WD pickups had 5 lug wheels back then. So
>he probably wants to look for a 70's pickup with a 12 bolt; ISTR that
>my dad's '73 had a 12 bolt posi in it but it has been so long since I
>looked under it that I may be mistaken.

I didn't even think along those lines, but you are correct that they
could very well have been 6 lug units. On the other side though, the
OP can easily have the axles replaced with the correct length and bolt
pattern units. It's very easy to replace axles and bearings on a 12
bolt rear.

...Ron
--
68'RS Camaro
88'Formula
00'GT Mustang
 >> Stay informed about: 12 bolt rear ends?