8" members

actionrpm · Jan 31, 2008

ratio411 said: ↑

Where do you get 75#???
The regular housing is 3# more and the entire chunk is 8# more.

Now if you go all out with HD housing, stock N-case, stock 31 splines, etc... you are looking at close to 30#.
Still no where near 75#.
All the aftermarket stuff is lighter, and far more options are available for lightweight and aluminum parts vs 8" stuff.
I imagine that aluminum chunk cost as much or better than one of the many 9" aluminum chunks out there.
I am not trying to get into a p'ing match, but the differences aren't that great, except for strength.

Some 9" drum brakes are very heavy, but only because they are much larger. 8" drums will bolt right to a small bearing 9", or better yet you keep them when you use your 8" tubes.
Crown Vic and Exploder discs are even lighter and better.
Versillies discs are very heavy, FWIW.

Just a heads up.
Click to expand...

This is what I do for a living,ratio pretty much hit the nail on the head,why spend all that money on an 8"?

CornedBeef4.6L · Feb 1, 2008

ratio411 said: ↑

Where do you get 75#???
The regular housing is 3# more and the entire chunk is 8# more.

Now if you go all out with HD housing, stock N-case, stock 31 splines, etc... you are looking at close to 30#.
Still no where near 75#.
All the aftermarket stuff is lighter, and far more options are available for lightweight and aluminum parts vs 8" stuff.
I imagine that aluminum chunk cost as much or better than one of the many 9" aluminum chunks out there.
I am not trying to get into a p'ing match, but the differences aren't that great, except for strength.

Some 9" drum brakes are very heavy, but only because they are much larger. 8" drums will bolt right to a small bearing 9", or better yet you keep them when you use your 8" tubes.
Crown Vic and Exploder discs are even lighter and better.
Versillies discs are very heavy, FWIW.

Just a heads up.
Click to expand...

I measured my alumin8 rearend housing on a batrroom scale tonight.

You are right I was off about 25 lbs. I am 50 lbs lighter than a dressed 9 inch.
8 inches are strong. I know of a few guys with 4 speeds and big blocks. They hold up just fine. They have after market axles, and arp bolts. What gives out is the carrier bearing bolts. They shear off. ARP stuff cures that.

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actionrpm Differential specialist

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actionrpm Differential specialist

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