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Old 05-17-2013, 07:20 AM   #1 (permalink)
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Default 1966 Rear-End

I understand the stock rear-end for a '66 Mustang with a 289/302 should be an 8" and the in-line six's came with the smaller 7" or 7.5" If im looking for a direct 9" bolt-in to put in a '66, what would be some good donor cars? Trying to avoid any cutting or welding.

I'm not sure what's under my '66. It came with the 289, but I was read that all 8" came with five lug axles. Well, all my wheels look like they're five lugs, but it looks like one lug was cut off all four wheels. I would think if they were four lugs by the manf., the lugs would be spaced evenly. Just looking for a little insight before I start to tackle it this weekend.
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Old 05-17-2013, 08:20 AM   #2 (permalink)
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Here's a good link to read through: Kevinstang's Ford Nine Inch Differential Page +

On edit, I found another link: http://www.ultrastang.com/info1.php

It'll help with ID'ing what you have and where to start looking for a replacement 9".
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Old 05-17-2013, 09:12 AM   #3 (permalink)
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I also have 66 was searching wed Jaguar. will fit went to my JY page 15 jags most missing the rear .. LOL DazeCars, Mustang IRS or Indepen dent Rear Suspension good reading on cheap rear for 66
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Old 05-17-2013, 12:28 PM   #4 (permalink)
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if 4 lug they are evenly spaced. sounds like yours had locks and they chopped off a lug on each spindle/axle. wes
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Old 05-17-2013, 10:55 PM   #5 (permalink)
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Direct bolt-in would be a 9 inch from another '65-66 Mustang. A '57-59 station wagon or Ranchero rear is an "almost" bolt in but requires '67-68 shock plates and u-bolts, new axles (big Ford's have 5 on 4 3/4" bolt circle, not the 5 on 4 1/2" needed), and I'm not sure whether your 8 inch backing plates and brake assemblies will bolt to the axle housings flange without some welding and re-drilling.
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Old 05-18-2013, 07:39 AM   #6 (permalink)
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The Versailles is what i went with. Its a direct bolt in. The Lincoln rear disc are funky, but you don't have to use them.
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Old 05-18-2013, 08:00 AM   #7 (permalink)
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Quote:
Originally Posted by Mac74 View Post
I'm not sure what's under my '66. It came with the 289, but I was read that all 8" came with five lug axles. Well, all my wheels look like they're five lugs, but it looks like one lug was cut off all four wheels. I would think if they were four lugs by the manf., the lugs would be spaced evenly. Just looking for a little insight before I start to tackle it this weekend.
You can solve this problem quite easily by replacing the cut-off studs. Studs are about $3 each, and I would replace the axle seals at the same time, about $20 each.
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Old 05-18-2013, 05:24 PM   #8 (permalink)
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Thanks for all the replies. Sorry for the delayed response. I'm a Deputy Sheriff and it's been a long shift.

Fast68, I'm not sure whether I'm going with the 302 or the 351W right now. The 289 seems to be a pretty strong motor that has had a little work done to it, so I will leave as is for now. I'm looking at the 9in. so if I do go with the built up 351W, I will know I have a rear-end that can handle it. I would like to be around 400hp. And the car is a automatic.

Mustang656man, never even thought about that. But it does make sense that a previous owner had to cut of lugs because they did'nt have keys to locks.

I've read several different views on the 8in. being able to handle a nice 351W and I would like to do it all right the first time and not regret it later. I've been looking for a good 9in. that will bolt right in and they appear to be pretty scarce around here, or maybe I'm just not looking in the right places.
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Old 05-18-2013, 09:44 PM   #9 (permalink)
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Quote:
Originally Posted by tx65coupe View Post
The Versailles is what i went with. Its a direct bolt in. The Lincoln rear disc are funky, but you don't have to use them.
The Versailles rear is NOT a direct bolt in. It's 2 inches wider than the '65-66 rear, requires the '67+ shock plates, and you need to either swap your existing brake backing plates, etc. over or hook up the rear discs to your existing brake system, including the parking brake. If you have drum brakes on the front and want to keep the rear discs, you also need to change the front brakes to disc.
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Old 05-18-2013, 09:50 PM   #10 (permalink)
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Quote:
Originally Posted by Mac74 View Post
I've read several different views on the 8in. being able to handle a nice 351W and I would like to do it all right the first time and not regret it later. I've been looking for a good 9in. that will bolt right in and they appear to be pretty scarce around here, or maybe I'm just not looking in the right places.
The only original 9" for the 64-66 Mustang was 64-66 Mustangs with the 289 High Performance engine. A very, very, very scare item anywhere. You can have one made, of course.

Short of that, Currie offers a reproduction 8" 4-pinion Traction-Lok differential that's stronger than many original 9" differentials.
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Old 05-18-2013, 10:49 PM   #11 (permalink)
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So, it sounds like it would be easier to build up the 8".
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Old 05-20-2013, 12:16 PM   #12 (permalink)
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I was doing some research last night and found some info on putting a 8.8 Explorer rear under 65/66 Mustangs with some modfiication. Anyone ever did this swap? I actually have an old explorer rear end out back so I figured I'd look into it as an option.
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