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Hello all,

Some Background on my car.

I have a 1978 Trans Am with a 10 bolt posi traction unit running a 4:11 gear ratio.

I am running a Butler Performance 455 Crate Motor, McLeod 11" Street/Strip non hydraulic clutch and a Tremec TKO 600 5 speed with a .64 5th gear. It has Dougs Long Tube Headers, a 3" exhaust system with Moroso Drag Racing mufflers. The front end has been updated with a Global West front suspension.

I have installed sub frame connectors and traction bars also. Finally, I am in the process of installing a roll cage in the car and mini tubs, prior to finishing out the interior.

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I have zero traction from a standing start if I apply a good dose of throttle, with my street tires..

I am a bit hesitant to put a set of drag radials on it, for fear of shelling the rear axle.

Now the point of all of this, has anyone ever used a 1957 to 1959 Pontiac rear end in their car? I have read that they are extremely strong and capable of standing up to some serious horsepower and torque. I have access to a very good fabricator/machinist, my brother and I am pretty sure we can adapt the rear axle to fit my Trans Am.

I would really like to keep the car all Pontiac, but parts availability for something that old is a concern.

Thanks in advance.
 

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They were great in the early 60s,leave them there.I put one under my 63 421 tempest 15 years ago.Although the posis are repoped and gears are avail they are very expensive to work on.You can buy a done made to fit 9in from diff co like Currie.Tom
 

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Yes, the big Pontiac chunk type rear is big and strong. They use to be the go to rear for lots of drag cars. But, They are rare now, and the parts are only made and sold by a few. And they are very heavy. So, if you feel you must keep your Pontiac all Pontiac, I suppose you could round up enuff parts to go with it.

http://fabcraftmetalworks.com/category/0006/REAR-END/3.html

But I feel there are better options. To stay Pontiac, you could use a beefed up 12-bolt, since the 12-bolt came in some 1970 Birds, and a few other Pontiacs. Complete 12-bolts, with aftermarket housings and HD axles and guts, are available, ready to bolt in, with drum or disc brakes. These are probably good to low 10's or maybe even high 9's on the strip.

http://www.strangeengineering.net/high-performance-street/complete-rear-end-assemblies/12-bolt/12-blt-street-rear-end-assm-std-posi-leaf-spring-mounts-no-brakes.html

http://www.moserengineering.com/complete-rear-end-assemblies/muscle-pak-rear-ends/12-bolt-musclepak.html

http://www.justrearends.com/ProductDisplay.aspx?ID=37d1b833-82cc-44f3-9ea8-0bd6b09dcabd

But, if for some reason, you think even an HD 12-bolt is not strong enuff, the Dana 60 is the best choice. These are also available as ready to bolt in units.

http://www.moserengineering.com/complete-rear-end-assemblies/moser-60-musclepak-muscle-pak-pack-dana.html

These 12-bolt and Dana rears are sold by several vendors. They will set 'em up with your choice of gear ratio, posi unit, axles and brakes. Prices can range as high as around $3500 or even more. :shock:

Mark Williams probably makes the strongest and highest priced rears. They can build 'em to take lots punishment..

http://www.markwilliams.com/bulletproof.aspx

Then, of course, everybody makes a 9" Ford crate rear. But, the Dana 60 is said to take less hp to turn. Therefore, it is more efficient, and preferred by many drag racers. The main advantages of the 9" Ford is the removable chunk. This makes 'em easier to swap gears in. You can even set up 2 or more chunks, with different ratios, and other guts. Some guys can change out a chunk in just a few minutes. Another 9" advantage is that there are more gear ratios available for them. :smile22:

http://speedtalk.com/forum/viewtopic.php?f=19&t=28258
 
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