8 3/4 or ford 9 in.

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Go with a Dana 60. I don't think the 9 inch is that strong. I have seen 400hp motors tear them up, and not the axles. I think you would have to go with a really modified one to hold up to your 100hp. THe Dana 60 is heavy but I bet will be less expensive in the long run
 
alright guys, i appreciate all the feed back even though some of it was pretty harsh. I'll strongly consider the dana 60 as I continue to research.
 
At least yous fellas get good prices on danas an 8 an 3/4 diffs!
here in australia, everyone goes 9inch cuz its readily available,easier
to get parts for an alot cheaper than mopar rear ends.

Here is my question, whats a 9 inch weigh,an 8 3/4 weigh, an what does
an dana 60 weigh?
 
My brother-in-laws blown aluminum Hemi makes 1080 hp run through a Jerico 4-speed in a leaf spring '69 Charger R/T. That is about as rough as you can get on a rear. He has the stock Dana 60 with strange axles.
 
SGBARRACUDA said:
I will arque that a 489 is stronger than a 742. The 489 stem diameter at the gear is 1.875 while the 742 is 1.750. The 742 bearing behind the yoke is much larger than the 489 which shares the same bearing as the 741. They are both good units but the 742 gets my nod for being the strongest.
Click to expand...
I agree. I chose the 742, for my narrowed 4.56 spool with Mosers best axles. It is a bullet proof rear, but not 1000 hp bulletproof.
 
Here's the scoop:
Mopar 8.75 Specs
Pinion Shaft Dia./Splines 1.38"/10 or 29 spline= 741
1.75"/10 spline = 742
1.88"/10 or 29 spline = 489

Axle shaft dia. 1.30"

Axle shaft material 4140 chrome alloy steel

Ford 9" specs
Pinion shaft dia./splines 1.313"/28 spline

Axle shaft dia. 1.20/28 spline
1.32/31 spline
Axle shaft material 1040 or 1050

Dana 60 specs
Pinion shaft dia./spline 1.625/10 early - 29 late

Axle shaft dia/spline 1.31/16 early, full float
1.31/30 late, full float
1.50/35 semi float
axle shaft mat, carbon steel

Man. output torque rating 5500 ft lbs, short duration
1500 ft lbs continuous

OK now that we have real facts and specs you guys make your call. My two cents says the 8.75 can be built up to handle the 1000 HP BUT you will spend more money doing so than you would if you just built you a dana 60. The ford isn't even in the running. Let me know if you need any other specs. Here to help.
Small Block
 
Just my two cents, but if you're building a 1000hp car, that means some serious money on engine, a tranny to back up a 1000hp, a suspension that will hook that kind of power to the earth, and a car to hold it all together. (Tubbed, tubed, etc...) And you're asking about using a junkyard casting, rebuilt mind you, but still a junkyard piece. Figure, what, $50,000 to do it all yourself, quarter mill for someone to do it for you the price a Dana is a drop in the bucket to keep the power to the wheels without launching little bits of metal at the safety safari and the crowd. 'Cause remember, it's not just about going fast, it's also about going fast safely. And exploding rears can have a devastating effect on how a car moves...
 
Best bang for your buck is a brand new Dana,built from Strange or Moser!What car and setup are you running?What,s the 1000hp coming out of?Clarify for better responses.
 
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