Will `67 Rear-End Fit `66?

FoMoCoPower · Dec 31, 2003

I am going to convert my `66 6cyl over to a 302 and 5-lug.I can get a `67 rearend drum-drum pretty cheap,but will t fit the `66 easily? I heard that it might be a lil wider,but would that be wider overall,or are the spring perches wider also?

Realmongo · Dec 31, 2003

No it won't fit. It is too wide. You need one from a 64.5 through 66 Stang or early Falcon. You can also use a late 50s passenger car 9 inch if you can find one. Go to www.ultrastang.com and click on the link for 9 inch rears for more info.

12sec67 · Dec 31, 2003

if you use new mustang rims the rear end will fit perfect and you wont need spacers.

65fsbkhipo · Dec 31, 2003

D.Hearne · Dec 31, 2003

The 65-66 spring perches are the same distance apart as the 67-70 Stangs. I pulled a 57-59 Ford 9" rear out from under a 66 Stang and bolted it right under a 67 Stang, no problem. 12sec67 was correct. All the early Stangs , Fairlanes, Torino's, Comets, Mavericks, and other mid size cars shared the same spring perch spacing.

65fsbkhipo · Dec 31, 2003

...Happy New Year!

FoMoCoPower · Dec 31, 2003

So which one is it......I can deal with the rear itself being a lil wider......and I can also remount the perches.....but which is it....the perches or hte rear itself??

D.Hearne · Jan 1, 2004

The 67-70 rear is 2 inches wider than the 65-66 rear. Spring perches are the same spacing. Like I posted earlier, I pulled a 57-59 Ford 9" from a 66 Stang, and stuck it under a 67 Stang. Only problem was the larger diameter axle tubes. Had to get new U-bolts, and the Lakewoood Traction bars took care of the spring plate issue with the larger U-bolt spacing. Another option on the 65-66 is using an 8" rear from a 75-79 Granada/Monarch, they also bolt into the early Stangs.

FoMoCoPower · Jan 1, 2004

So the `67 rear is 1" wider per a side but the perches are in the same locations?

D.Hearne · Jan 1, 2004

Yes they are.

kukm66 · Jan 1, 2004

Here is another link showing some valuable info:

http://www.nzmustang.com/TechData/9inchdiffs.htm

The 3 key issues here are 1) spring perch width 2) lenght from drum to drum
3) flaring of axle tube

You can always use different backspacing to compensate for the extra length.
Spring perches can be relocated if you want to deal with that issue.
Always get the mounting plates with the rear end.

67efivert · Jan 1, 2004

the perches are the same i pulled a rear out of my 67 parts car and we put it in my buddys 65 with no problems

bifs66 · Jan 1, 2004

I installed an unmodified 9" rear out of a 68 Cobra Jet Mustang into my 66 Fastback. The spring perches are a perfect fit. However, all 67->up 8" and 9" rears have a slightly larger tube dia at the spring perches than the 65/66 Mustangs. This means you need larger U-bolts (2 7/8") and spring/shock plates from a 67->up Mustang. Mustangs Unlimited listed those parts in their catalog for around $50 a pair. I compensated for the 1" (per side) extra width by using wheels with 1" greater backspacing. In my case, I had a new drivshaft made because the 9" rear center section had a longer U-joint yoke. If you're using an 8" rear, the U-joint may not be an issue.

HistoricMustang · Jan 1, 2004

It will fit. I ran one in mine for years before having it narrowed for larger (8 1/2") rims.

HistoricMustang
www.historicmustang.com

12sec67 · Jan 1, 2004

65fsbkhipo said:
Beg to differ...Happy New Year!

my cousin and i swapped them, his 66 mine 67 because i wanted fatter tires and he wanted newer style rims.

Realmongo · Jan 1, 2004

D.Hearne said:
The 65-66 spring perches are the same distance apart as the 67-70 Stangs. I pulled a 57-59 Ford 9" rear out from under a 66 Stang and bolted it right under a 67 Stang, no problem. 12sec67 was correct. All the early Stangs , Fairlanes, Torino's, Comets, Mavericks, and other mid size cars shared the same spring perch spacing.

Rodger to the spring perch spacing, but wouldn't the extra 1" of width on each side cause the tires to rub against the inside lip of the wheel well radius?

allcarfan · Jan 1, 2004

I have a friend with an unmodified 9" from a 69 mach one in his 65 coupe. Fit perfect. He is selling it to me...yay.

Edbert · Jan 2, 2004

bifs66 said:
I installed an unmodified 9" rear out of a 68 Cobra Jet Mustang into my 66 Fastback. The spring perches are a perfect fit. However, all 67->up 8" and 9" rears have a slightly larger tube dia at the spring perches than the 65/66 Mustangs.

I know the 67-70 9-inch is a larger tube than the 65-66 9-inch, it did not have the dramatic taper the early ones did. But are you sure that is also true of the 8-inch?

I just dropped my 67 8-inch out to replace with a 9, so I've got one on the floor in my garage if you need measuring (or pricing ).

GaPonyFarm · Jan 2, 2004

allcarfan said:
I have a friend with an unmodified 9" from a 69 mach one in his 65 coupe. Fit perfect. He is selling it to me...yay.

Unless you're running the newer style rims, it will look stupid. The more narrow 65/66 rears look fine under the wider 67/up, but the wider rear from the 69 will cause your tire to protrude outside the fender wells, unless you have very skinny tires. One other problem...can you say fender rub?

Trust me on this... I've been there....more than once.

BTW... can you e-mail me about your powdercoating services. I just live up in Columbus. pford59257@mchsi.com

allcarfan · Jan 2, 2004

Pony Farm....welcome newb...email sent...

Will `67 Rear-End Fit `66?

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