DP rear axle assembly

[Myron Piatek]

Originally Posted by Eric Merryfield

For the super brave I have a NOS in the box sure-grip for the 8 1/4...I wouldn't do it but you could....the 9 1/4 will not work due to lack of Spool and gear choices.....but you could run it with a sure grip, I run a nice detroit locker in the Lil Red this way.

8.75 and dana 60 are your logical choices, more gear choices for the dana 60 and of course it will live behind any of the DP motors, whether or not you gain any ET with a 8.75 is a consideration, as is your tranny if the ring and pinion goes.

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.

[Stewart Way]

Myron
Are you thinking of Jim Kinnett? I know he ran a 12 bolt gm but don't remember the 9 1/4.

[Myron Piatek]

Originally Posted by Stewart Way

Myron
Are you thinking of Jim Kinnett? I know he ran a 12 bolt gm but don't remember the 9 1/4.

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

[340Cuda]

To reinforce what Myron was saying, we went from a 8 3/4 to a Dana 60 many years ago and in spite of the additional weight no change in ETs. The only real difference is that it quit spitting the gear out after trips thru a dip that was in the left lane in Tulsa at the time.
Bill

[DonatoEng]

Jeff, That would make a 9" legal in an 09 or 10 DP with the 426, but illegal with all other engines.
And the reason ?

[Stewart Way]

There was no 426 or 9" in the 09 and 10. Not till 11.

[Jeff Teuton]

Any DP with a 426 Aluminum motor is a 2011.

[Jim Wahl]

Originally Posted by Myron Piatek

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

.

[Jeff Teuton]

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.

[Stewart Way]

Jeff
I agree with everything you have written. The old techman in me is just trying to wrap my little brain around how this then applies to the rest of the Mopar fleet. It would seem that once the Strange9 was submitted on the TI and approved it then became "another from the same automobile manufacturer" as the rulebook requires to then be allowed for all Mopar stock racecars. Much the same as Mike described the Dana. Both built by an outside manufacturer and accepted in a car (Strange9) or cars (Dana) by NHRA and therefor would seem to be accepted in all Mopars as the Dana is. Again, where is my logic flawed?