8.5 or 9in rear

[fly1]

would a 8.5 hold up to a 500 hp big block with 600 ft lbs of torque or should i go with a 9 in. my 7.5 wont hold up

 

[RITTER]

Run the 7.5" til she blows

The Ford 9" is overkill for 99% of street cars. They weigh a lot more than an GM 8.5" 10 bolt and the 8.5" will handle your big block setup. Now if you are planning on running slicks at the drag strip every other weekend, then you will want to invest in the Ford 9" :idea:

 

[pontiacgp]

Like Ritter said, it all depends on your needs...one thing with the 9" the parts are easier to find

 

[fly1]

so you guys think the 8.5 is reliable with street tires. I will act a fool and do burnouts and donuts. No use in lying so it needs to handle the abuse which is why the 9 in is for sure safety. But I have heard good things about the 8.5 and its cheaper

 

[pontiacgp]

an 8.5 is cheaper?...plus they are hard to find. 9" came on alot of ford products and it's easy to resize the length of the axle tubes

 

[Blazenlotus]

an 8.5 is cheaper?...

X2

 

[Blake442]

By the time you get done over-paying for an 8.5, and then rebuilding it... you could've just gotten a 9 inch.

Go with the 9 inch.

 

[shotgun]

8.5 will handle your BB all day long assuming it is put together right.

My Pontiac dynoed at 630 hp and the 8.5 handles wheels up , 10 flat runs just fine.

 

[FastGuyTim]

Get a Currie 9. They have them on the shelf ready to bolt into a g-body... I swear by them! 8.5's are ok at best, when you have REAL horsepower get a 9. A built 8.5 vs a 9...the cost is not much different.

 

[FastGuyTim]

http://www.currieenterprises.com/cestore/productsCR.aspx?id=2692&p=1249.9500


Here is the link