Rear end question

67 Demon · 05-23-2002, 10:04 PM

I was wondering if anyone happened to know what the factory (stock) size was for a 67 Fastback. I have a 3.00 differential and was wondering if the rearend was an 8 in. or a 9 in. Also what year were the 8.8 rearends made? Thanks for all the help.

CobraII76 · 05-23-2002, 11:20 PM

Well I believe it should be an 8 inch rear end. The 8.8 came out in the mid 80's I think 85-86 in the Stangs. And the 8.8 is current today. Nothing like an 8 or 9 inch rear having had all 3 under various cars my vote goes 9 first 8 second 8 third I don't much care for the quad shock internal carrier rears.

David Fulford · 05-24-2002, 07:58 AM

The easiest way to tell is to look at the bottom most bolts that hold the third member in the housing. If you would be able to get a socket on those bolts to loosen them, it's an 8". If the shape of the metal on the third member will only allow you to get an open end wrench on those two bolts, it is a 9".

67 Demon · 05-24-2002, 12:04 PM

Cool, thanks guys. I really appreciate the info from your reply's. I guess i'll have to try and get a socket on those bolts when i get back from vacation.

J&MStang · 05-24-2002, 11:39 PM

The standard ratio for a 4 speed was 3:00 and the standard ratio for an automatic 2:71. Optional ratios were 3:25. 3:50, 3:89 and 4:11. All ring and pinions are still made however the 3:25 is the hardest to find.

67 Demon · 05-26-2002, 11:36 PM

I'm not sure where my car fits in on the most recent post, but like i said, my ratio is 3:00, but my car is a 3 speed standard. Maybe i'm just confused now.

J&MStang · 05-27-2002, 09:25 PM

Quote:

Originally posted by 67 Demon
I'm not sure where my car fits in on the most recent post, but like i said, my ratio is 3:00, but my car is a 3 speed standard. Maybe i'm just confused now.

Perhaps I should have said "manual" instead of 4-speed.

05-23-2002, 10:04 PM	#1
67 Demon Registered Member Join Date: May 2002 Location: San Antonio, TX Posts: 12	Rear end question I was wondering if anyone happened to know what the factory (stock) size was for a 67 Fastback. I have a 3.00 differential and was wondering if the rearend was an 8 in. or a 9 in. Also what year were the 8.8 rearends made? Thanks for all the help.

05-23-2002, 11:20 PM	#2
CobraII76 Registered Member Join Date: Jan 2002 Location: Michigan Posts: 56	Well I believe it should be an 8 inch rear end. The 8.8 came out in the mid 80's I think 85-86 in the Stangs. And the 8.8 is current today. Nothing like an 8 or 9 inch rear having had all 3 under various cars my vote goes 9 first 8 second 8 third I don't much care for the quad shock internal carrier rears. __________________ 74-78 MustangII's So many II's so Little Time.

05-24-2002, 07:58 AM	#3
David Fulford Registered Member Join Date: Oct 2000 Location: Charlotte NC Posts: 193	The easiest way to tell is to look at the bottom most bolts that hold the third member in the housing. If you would be able to get a socket on those bolts to loosen them, it's an 8". If the shape of the metal on the third member will only allow you to get an open end wrench on those two bolts, it is a 9". __________________ 1969 fast back; yellow; weld wheels; 302 roller with GT-40 heads; 3:55 gears; 5spd T-5; MSD 6AL; E-303; flows; Hedman headers; Holley 600;Weiand Accelerator;1.6 rockers

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05-24-2002, 12:04 PM	#4
67 Demon Registered Member Join Date: May 2002 Location: San Antonio, TX Posts: 12	Cool, thanks guys. I really appreciate the info from your reply's. I guess i'll have to try and get a socket on those bolts when i get back from vacation.

05-24-2002, 11:39 PM	#5
J&MStang Registered Member Join Date: May 2002 Location: Moore, OK Posts: 25	The standard ratio for a 4 speed was 3:00 and the standard ratio for an automatic 2:71. Optional ratios were 3:25. 3:50, 3:89 and 4:11. All ring and pinions are still made however the 3:25 is the hardest to find.

05-26-2002, 11:36 PM	#6
67 Demon Registered Member Join Date: May 2002 Location: San Antonio, TX Posts: 12	I'm not sure where my car fits in on the most recent post, but like i said, my ratio is 3:00, but my car is a 3 speed standard. Maybe i'm just confused now.