how much power will a 8.75 put up with

[leanburn]

i want to get my diff back together soon, i have a 489 but its a cone style.i have a 408 stroker at 500hp but i hope in the near future i will be 600+ with a newer hemi and supercharger .  the car is an auto and will go down the track on ocassion with street slicks. what do i have to do for 600-650 hp?

[brads70]

I'm just in the process of installing a 451" and was in your shoes too. I went with Neils recommendation and bought a new Dana from DrDiff.  Buy the time you build up a 8 3/4 you will be into the same or more than a new Dana. The Strange Dana's are lighter than the original Dana's but do not give up anything in strength. Also you can order/upgrade to a true trac diff and pick your gears. 1350 U joints, bigger tapered wheel bearings, etc... ( that's how I odered mine)
It just made sense to me about the Dana. I suggest you shop around get some quotes and do the math.
I sold my 8 3/4 before I owned 2 of them  .... while it was still worth something!
With a new Dana you will know for sure that you put your best foot forward and won't worry about breaking it. With the 8 3/4 I would always be wondering?
 

[leanburn]

 ive been doing some reading and i wish i would have done my research before i painted and put new brakes and lines on my 8 3/4.
  truthfully a new dana isn't in the cards right now. i'm hopeing i can build my exsisting diff for the current power and then if i do the hemi conversion then i will get the dana. i know that it's wastefull but honestly i might not do the conversion.
 i talked with one guy and he was trying to convince me into a detroit locker, ive been in cars with these and i can't stand the clunkin and bangin.  how much hp is a stock clutch style posi good for?

[Topcat]

We've talked about this before here.

What I recall being said is that the Dana has a 4 tooth contact gear mesh whereas the 8 3/4 is 3. Then add to the fact that the Dana has a wider Ring gear width than the 8 3/4 ring gear.

8 3/4 on street tires can handle alot thru a manual tranny. Once you go slicks, the Dana becomes more a safety factor against breakage.

Danas weigh more. The rear end weight ratio: front to back on E bodies isn't the greatest.  Yet the Dana takes a little bit away. In the end, the Dana wins over the 8 3/4 once you cross the 500-600 torque numbers.

[nqkjw]

I stripped the crownwheel and pinion in my 8 3/4 a while back.
It was a spooled 741 case with original 3.55s and abt 400hp going through it in an Abody..
It had done around 250 passes at the time.

[Chryco Psycho]

as long as the tires spin the diff will live , add slicks & traction & it will break sooner or later
I would look at a True track torson style diff over a locker .

[leanburn]

what kind of power will a true trac tolorate?
 do you know of a dealer in calgary?

[BS CUDA]

what kind of power will a true trac tolorate?
 do you know of a dealer in calgary?

Leanburn - you can maybe call me at The Gear Centre and I might be able to help. 
I wouldn't worry about the True Trac - its the crown and pinion you need to worry about. I run 620ft lbs on drag radials and hook hard when heated(160 - 60ft times). Have roughly 180 passes and still holding up - 8 3/4 Auburn posi and 4.10 gears.

[leanburn]

 i'm working in a bad sevice area for next few days. i will call as soon as i can.  who do i ask for?

[BS CUDA]

i'm working in a bad sevice area for next few days. i will call as soon as i can.  who do i ask for?

I'm Gary - 403-252-3880 or 1-800-661-1378. Make sure you mention CC.com and I will do the best I can on the price.