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Old 02-21-2017, 06:45 PM   #1
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9 inch almost done

Finally done tomorrow. Of course had setbacks. Needed new brake back plates, yoke issue, then drive turned out to be crap. New drive shaft ready tomorrow. So now it's a 9", 31 spline, 11" new drums, posi, 3.50 gears and new 3" drive shaft. Good bye 8 inch 2.79.
Should be awesome.


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289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.
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Old 02-22-2017, 04:51 PM   #2
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Another unforeseen delay. Driveshaft is garbage, so waiting on a new one.


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289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.
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Old 02-23-2017, 01:45 AM   #3
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Sweet!
That's a nice upgrade!
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Old 02-23-2017, 09:11 PM   #4
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Back on the road. Super sweet. Brakes better and gears made a huge difference. Speedo is now off about 30%, some big gear difference.


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289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.
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Old 02-23-2017, 11:35 PM   #5
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What made you chose that instead of a 8.8?


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Old 02-24-2017, 09:20 PM   #6
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Everyone uses the 9 inch. Tons of chevy builds use a Ford 9 inch. They're easy to install and bulletproof.


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289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.
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Old 03-24-2017, 03:02 PM   #7
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Any value in the old 8" setup?


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289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.
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Old 03-24-2017, 07:31 PM   #8
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Quote:
Originally Posted by Aggiesrok View Post
Any value in the old 8" setup?


Chevy runs deep, don't step in Chevy.

8" fords are still very good. Especially if you have the 67+ unit with the cross braced ## casting, instead of the one with the Flat == casting supports in the case front.

They are plenty strong, can be fitted with a trak-lock diff and have all the same advantages as a 9". I have know some vintage mustang guys who prefer them for a little less rolling resistance.

..But with 2.79 gears, it would need to be upgraded to sell for much more than just core value.
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Old 03-24-2017, 08:02 PM   #9
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Yeah if you are making ludicrous power going all the way to plaid then 9" is the way to go. Not sure I'll ever make enough where an 8.8" can't get it done tho...





































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Old 03-24-2017, 11:11 PM   #10
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8in's go for like 250 on my local Craigslist


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Old 03-25-2017, 12:36 AM   #11
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Yeah if you are making ludicrous power going all the way to plaid then 9" is the way to go. Not sure I'll ever make enough where an 8.8" can't get it done tho...





































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Old 03-25-2017, 07:17 AM   #12
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Teeheheheheheeee

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Old 03-27-2017, 12:32 PM   #13
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Yeah if you are making ludicrous power going all the way to plaid then 9" is the way to go. Not sure I'll ever make enough where an 8.8" can't get it done tho...
Plenty of people putting down 700+ HP through a 8.8"

Depending on what your building... There are other advantages to using the 9" platform.

If you get the right version, you can swap one right over to replace an existing 8" housing. Even the brakes can be swapped if you have the right large/or small bearing version.

Swapping an 8.8 into a vintage mustang can be done, but you might have to deal with new spring perches, possible offset pinion position and converting to a disk/disk MC.
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Old 03-27-2017, 08:54 PM   #14
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Yeah went with a posi 9. Just wasn't sure if I could get any money for the old 8".


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289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.
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