So I've been reading ALOT about this swap.
1966 mustang has a 8" rear end that is 57.25" wide wheel flange to wheel flange.
Currently it has an open diff with I think 3.00 gearing. so i can do one wheel peels forever. (with the AOD, the RPM's are just above idle on the expressway)
I recently bought some bullitt rims and tires that rub on the inside of the tire on the leaf spring. So my choices are to buy adapter plates or a wider rear end.
Since I want to change the rear end gearing to a 3.73 or 4.10 and toss some type of posi track in there, I started reading on line to see what my options are to adding adapter plates (better than spacers) and then later rebuilding the rear end to get what I want.
I discovered many people swap Ford Explorer rear ends into their old mustangs. They are 8.8, 31 spine and usually 3.73 or 4.10 with a trac-loc installed. Sounds great.
Furthermore, the rear end from a 1997 explorer is Width 59.5" wide wheel flange to wheel flange. This means an extra 1.125" on each side over my stock 8" that is in there now to help offset the rims (which i think will be enough). (59.5 - 57.25) x.5 = 1.125/side.
Obviously, I will have to have new leaf spring and shock perches welded onto the explorer rear end so it will fit on the '66 mustang.
Sounds like everything will work fine. AH.. but there is an issue.
The Pinion on the Ford Explorer is offset to right of center 2-3/16" It is not centered like the stock 8" mustang.
So I am going to have 2 pinion angles.
I've read where this creates and issue and others it doesn't create an issue.
What some have done is taken the 8.8 Ford Explorer rear end long tube and cut it down to center the pinion and simply grabbed an extra short tube axle from another 8.8 Explorer rear end (from a junk yard) and put it in there. This centers the pinion. That's fine, but then the overall width of the axle will be close to my stock width and I will still need wheel adapters to offset the Bullitt rims. (Instead of wheel spacers, I would use wheel adapters, as i read they are much much safer).
something like this:
My questions is:
IF I use the stock Explorer rear end that has its pinion off set to the right 2 3/16" and my drive shaft does not hit the tunnel, will I have vibration or premature wear issues?
If I get a rear end with disk brakes, do I HAVE to have a power booster for the brakes? The reason I'm asking is currently the car has no power brakes and to add a booster will add a several hundred dollars to the cost. With a 4 month old at home, I'm trying to keep it on the cheap side.
what are your thoughts or other options that I haven't considered.
Keep in mind that I can get the rear end from a junkyard under $150 and will need under $100.00 in other parts.