I have a 67 coupe with a straight 6. I am planning out my suspension upgrades, including 4 wheel disc brakes. I have the front pretty much planned out, but I am not sure what to do wit the back. I'm assuming I have an 8" rear. My brother is recommending replacing that with a Ford 8.8" to get the 5 lug tires and disc brakes. Most posts I read on here say to get a 9"
TCP coil overs, Granada disc brakes (diskbreakswap.com), and rims and tires.
What are the pros and cons between an 8.8" or 9" rear. Which requires more modification to mount.
After the suspension I plan to replace the engine with a 5.0 roller, probably around 10:1 compression, maybe a stroker with 2 4 barrel carbs.
I'm not a mechanic. I'm learning as I go. So what are the opinions on the rear end?
I believe your brother is wrong about your current rear end. If it is a 4 lug, it should be a 7something incher. Unless someone changed it out already.
I would go with either an 8 or 9 inch out of a 67-70 Mustang for ease of installation. You would just need the leaf spring plates and u bolts. Plus the driveshaft. Depending on the torque and horsepower, and transmission, an 8 inch is really pretty cheap and works for most.
RIP Mallory. We miss you.
You too Abbie. :-(
Sadie too, for a year now.
I have an 8" housing if you need it (for a 67-68). Please buy it. I can't get rid of it in Canada..
Barring that, 8" should be good up to 400 or so assuming you don't beat the hell out of it with slicks and what not.. Maybe 350.. Not sure of the numbers exactly. I think a 9" would be overkill for a 5.0, but thats just me.
Can't blame my brother for the 8" comment. That was my assumption from reading this board. I thought the Mustangs had at least an 8". Yes I have the 4 lugs so I probably have a 7". Thanks for the info.
9" would be the easier install between that or an 8.8". To get the 8.8 installed the easiest donor to start with is from a '87-'93 5.0 Mustang. They are the right width housing and are not real hard to find with a 3.23 gear and trac-loc. Then you have to cut off the control arm brackets, weld on leaf perches at the correct width and pinion angle, and finally swap out the axles and brake drums for 5 lug units. An 8" or 9" from a V8 '67-'70 Mustang/Cougar is a direct bolt in. A rear from a '71-73 will also bolt in but is 1" wider per side which may need differnt rims. I'd go with the 8" unless you're planning to build a rear from a bare housing or are going to run over 350hp. The 9" has a lot more aftermarket support so they can actually be cheaper to build from scratch than an 8".
"It's not having what you want, it's wanting what you've got!" - Sheryl Crow
I spent less than $200 to get an 8.8 under my 67, not counting the driveshaft.
$100 for the Fox 8.8
$70 for ranger axles and drums from a junkyard
$13 for perches
$10 for fluid
$235 for a new driveshaft
I had a stock 6 cylinder car, so using the original was not even considered. The driveshaft is 50" long and uses the 8.8 flange in the rear with 1330 u-joint and a 1330 yoke in the trans.
I don't think I could do a 9" posi that cheap. Most vintage people like the 9", but late model people realize the 8.8 is plenty strong for most people. 8.8s are well supported in the aftermarket too.
Use the rear out of a '96 Explorer. 3.73:1 lockers, disc brakes. Because the Explorer has leaf springs, all you have to do is move the perches (or buy new ones from Summit or ?). The 5-lug pattern already matches the std. Mustang. The hardest part is hooking up the parking brake. One caution, the explorer has equal length axles, so the pinion is offset. You may have to hammer the tunnel. The width is the same as the '67.
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