12 bolt rear end. keep or swap?

[driver44m]

I have a 12 bolt rear end in my 76 new yorker.Im familiar with the 8 3/4 rear ends but know nothing about the 12 bolts.My question is this, keep the 12 bolt or swap it out for something else? Eventually i will be doing a mild engine build and upgrade the whole drivetrain.Any info or opinions are appreciated.

 

[70bigblockdodge]

Its not a 12 bolt. Should be a 9 1/4, some small motored c bodies did have 8 1/4. You will not break a 9 1/4 but sure grips are weak except for new tru trac.

 

[commando1]

He'll never get enough horsepower to break that rear.
His problem is that more than likely it is a 2.73.

 

[68plymouth383]

The 12 bolt Chrysler 9 1/4 rear axles are very strong. That's what trucks have used for years. Taken care of it will do fine in your car.

 

[driver44m]

thanks for the info guys.

 

[polara71]

12......:laughing4: ... spoken like a Chevy guy. They count the bolts because they read a ruler......Might as well say its a posi...


all in fun of course

ccasion14:

 

[1978 NYB]

 

[1978 NYB]

 

[driver44m]

you got it. i was raised on chevys and i built some wicked rides. I guess im older now and would rather ride comfortably in a land yacht.

 

[driver44m]

I have had a bunch of chryslers with the 8 3/4 and thought those were supposed to be bullet proof.I never broke one in the derby anyway.

 

[polara71]

Am I missing the 8 3/4 for Cs in that chart?

 

[commando1]

The dimensions for would be the same as the C-body 8-1/4 and 9-1/4.
59.2/47.3/11.69.

 

[polara71]

The dimensions for would be the same as the C-body 8-1/4 and 9-1/4.
59.2/47.3/11.69.

Yeah, but its not listed

 

[commando1]

Fixed

 

[68plymouth383]

You da man Stan!!

 

[polara71]

But are we certain

 

[has2bmopar]

But are we certain

Well... :no: Not so much, as the axle centerline to the yolk/rear universal joint is 12.35" for the 8.75".... According to this chart anyway...

 

[polara71]

That's what I thought