CLASS RACER FORUM - DP rear axle assembly

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Re: DP rear axle assembly

The upgrade is for the 2009 or2010 not for the 2011 is what I was told.
Dan

Re: DP rear axle assembly

The NHRA rule book in Stock states; "Original rear end may be replaced with another from the same automobile manufacturer; truck rear end prohibited."

2009 and 2010 Drag Pak Challengers originally came with NO rear end so a racer of one of these cars isn't replacing the original rear end, simply installing it. The only rear end this automobile manufacturer ever spec'ed for a Drag Pak Challenger is in the Mopar parts system listed as part number P5155850.

Automobile manufacturers purchase most axle assemblies from suppliers like AAM and Dana. Mopar contracted Dana to build a Dana 60 for automobile use (NHRA prohibits the use of truck rear ends) and this was some 45 years ago. Mopar put a part number on it and used it in their muscle cars for a few years making it legal for use in NHRA Stock. Mopar never owned Dana Corp. and didn't manufacture the axle they just bought special Dana 60 rear axles from Dana and assigned a part number to it thus making it legal by NHRA.

Mopar part number P5155850 is the only part number Mopar list as a rear end for a Drag Pak. It is manufactured by an aftermarket automotive supplier and is in fact the original rear end spec'ed for a Drag Pak since NO rear end came in a 2009 or 2010 Drag Pak from Dodge. It is BTW the very same Strange Nine used in all of the factory hotrods being built today. Cobra Jet Mustang, COPO Camaro and yes, Drag Pak Challenger.

The P5155850 was put into the Mopar parts system in 2010 and anyone can check with Mopar or online to verify the info above. This Strange Nine rear axle has been approved by the NHRA for all 3 brands factory race cars. This is obvious when reading the 3rd paragraph in section 8-Stock in the NHRA Rule Book. "OEM may apply for inclusion of any special production runs into the Official NHRA Stock Car Classification Guide." If the NHRA didn't approve it then how did the Drag Pak make it into the Classification Guide? Call it a Nine Inch, call it an 8 & 4 quarters or call it a P5155850. I sure hope this clears things up!

Re: DP rear axle assembly

Quote:

Originally Posted by Jeff Teuton (Post 394083)

Any DP with a 426 Aluminum motor is a 2011.

Never mind this is a rear end thread ...

Ron

Since I have not seen one does the engine and manifold assembly fit under the aluminum V10 hood
In other words does it have the tall DP manifold with a fuel injection throttle body?

Re: DP rear axle assembly

Quote:

Originally Posted by Myron Piatek (Post 393940)

Wasn't there a SS/AA Cuda racer here in the southeast that ran a 9 1/4 rear? He later tried Pro Stock - Maybe a Duster, then Volare. X&*#@* I can't think of his name. (Not Bagwell.)

A Dana 60 is actually a pretty efficient rear due to the ring & pinion orientation. 12 bolt is the best and 9" the worst. There was a magazine article about it years ago. I've heard of some racers switch between the Dana 60 and 8 3/4", adjusting the overall weight, and didn't see any ET difference worth mentioning.

I remember reading that Rick Johnson ran, and may still run a 9 1/4 Mopar axle in his SS/AA Barracuda.

Re: DP rear axle assembly

Mike
Taking what you added one step beyond....Would this 9" being in all three factory racecars then open the 9" up for use in any GM, Ford and Mopar in Stock? It would appear at least for any Mopar since it has an actual Mopar PN and came in a Mopar. Or would you have to use a Strange9 since they are the original manuf of the rear, not Ford?

Re: DP rear axle assembly

Don't get carried away with words. A 512 V10 and a 426 all aluminum engine are both 2011 models and can run the 9" axle. The 2009 5.7, 5.9, 6.1 and 6.4 can't run the 9". And the 2010. No 9" for the motors I just listed. The 5.7;, 5.9, 6.1 and 6.4 can't run the 9".

Re: DP rear axle assembly

But all we have is words. NHRA writes them and we try to figure out what they mean. As the rules are written, where is my logic wrong in my earlier post? The strange9 being offered in a Mopar and having a Mopar PN should make it legal. But then I'm not sure logic is always used rule application, not to mention my logic has been flawed in the past at least once, maybe more.

Re: DP rear axle assembly

Quote:

Originally Posted by Myron Piatek (Post 393966)

Yes, Jim Kinnett. I suppose someone could have confused the 2 rears. I didn't see it myself. Thank you for clarifying that.

It was Jim Kinnett. I actually have pictures of the 12 bolt in that car somewhere. It was in the Volare'. Jim

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Re: DP rear axle assembly

The TI sheet for the 2011 V10 and the 2011 426 allow a 9" rear axle. This is what NHRA approved. Really pretty simple. The TI sheet is what manufacturers submit to NHRA for approval for specific approval of a car/engine combo. Anyway this is for information only. Do what you want.