Ford 9" rear end - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71custominworks · 10-28-2003, 05:14 AM

I'm going to put the 9 on my 71 C-10 SWB fleetside. I am going to plan on putting on 20's but may go up to 24's. Do I only need to relengthen the 9 to what my stock rear end is? Will the wheel size matter?

rustyold69 · 11-03-2003, 08:18 PM

i dont know about the lengthing but i know that wheel size doesn't matter

cdowns · 11-03-2003, 08:49 PM

you'll have to get the axels drilled for GM boltpattern

**Warrens69GMC** · 11-03-2003, 09:08 PM

If you need the bolt circle changed (5 lug?) The fullsize cars (73-80) used the 9 in them with a 5x5 bolt pattern. The are also close enough that the may not need narrowing.
warrens69gmc

68LSS1 · 11-04-2003, 12:37 AM

Since your getting new wheels I wouldn't worry about changing the wheel bolt pattern unless you want to be able to rotate them. But with most people getting different sized wheels front/rear or directionals or offset you probably can't anyway. I'm using a 8.8 out of an Expedition. It was about 4 or 5" narrower. You'll just have to order custom offsets when you get your wheels(probably won't be able to use original backspacing). On most wheels that doesn't cost any more. And you could easily get 5 on 5 rotors for the front. I'm just going to run the 5 on 4 1/2" on back and 5 on 4 3/4" on the front.

**Warrens69GMC** · 11-04-2003, 04:44 AM

The 9 inch in the f100's vary between 60-64 inches between backing plates. A 9 inch from a 64-72 f 100 should be the correct width for 5 lug and redrilling the axles for 5 x5 would be best done when replacing the seals and pressed on bearing. Then just use the car drums of the same size or hae those drums redrilled.
warrens69gmc

10-28-2003, 05:14 AM	#1
71custominworks Junior Member Join Date: Nov 2002 Location: Columbus, KS Posts: 83	Ford 9" rear end I'm going to put the 9 on my 71 C-10 SWB fleetside. I am going to plan on putting on 20's but may go up to 24's. Do I only need to relengthen the 9 to what my stock rear end is? Will the wheel size matter?

11-03-2003, 08:18 PM	#2
rustyold69 student wrench turner Join Date: Jan 2003 Location: wrightstown, wisconsin Posts: 192	i dont know about the lengthing but i know that wheel size doesn't matter __________________ 1969 Chevy C-10 with 250 L6 2002 GMC Sierra 2500 HD Duramax with banks six gun

11-03-2003, 08:49 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	you'll have to get the axels drilled for GM boltpattern __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

11-03-2003, 09:08 PM	#4
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,625	bolt circle If you need the bolt circle changed (5 lug?) The fullsize cars (73-80) used the 9 in them with a 5x5 bolt pattern. The are also close enough that the may not need narrowing. warrens69gmc

11-04-2003, 12:37 AM	#5
68LSS1 Registered User Join Date: Dec 2002 Location: Tampa Posts: 1,191	Since your getting new wheels I wouldn't worry about changing the wheel bolt pattern unless you want to be able to rotate them. But with most people getting different sized wheels front/rear or directionals or offset you probably can't anyway. I'm using a 8.8 out of an Expedition. It was about 4 or 5" narrower. You'll just have to order custom offsets when you get your wheels(probably won't be able to use original backspacing). On most wheels that doesn't cost any more. And you could easily get 5 on 5 rotors for the front. I'm just going to run the 5 on 4 1/2" on back and 5 on 4 3/4" on the front. __________________ '68 Short Step LS1/T56, Hydratech, Fatman Fabrications Stage III, Baer, Hot Rods to Hell, US Body, S&W, etc Last edited by 68LSS1; 11-04-2003 at 12:40 AM.

11-04-2003, 04:44 AM	#6
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,625	9 inch The 9 inch in the f100's vary between 60-64 inches between backing plates. A 9 inch from a 64-72 f 100 should be the correct width for 5 lug and redrilling the axles for 5 x5 would be best done when replacing the seals and pressed on bearing. Then just use the car drums of the same size or hae those drums redrilled. warrens69gmc

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