I am looking for a 9 inch rearend housing for my son's 66 mustang. Does anyone have experience with the aftermarket units out there? He running a modified 289, nothing outrageous. Thanks
my friend Mike may have what you are looking for, will ask if he wants to sell one of his differentials
If you can find one out of a 1957 Ford Car, they are really Narrow.
My recommendation is to communicate with a knowledgeable shop whom can put together what it might be that you need and just order a newly made unit including internal componentry appropriate for your requirements. ;)
If you would wish, we can help you, contact: 407-843-3673.
Scott.
Currie makes a nice reproduction less the rear fill plug
Yes, a 52" like out of a 1957~ Ford will work, the tubes do not narrow down so you'll have to switch plates and u-bolts, was very popular mod in the day when '57 Fords were in junkyards.
Granada style 9in housing, w factory disc brakes, are also 52" width is also a popular easy option for a non-concours application.
Curries' used to use 8" tubes on a 9" pumpkin which was 'ok' but noticeable for those really looking, they may have since changed (?). Mitch Jackson used to supply them to Currie, but he has since passed.
There were 100% reproductions being made a few years ago, when the Hipo K Exchange Forum was up, status unknown now.
Quote from: SFcarbuff on November 16, 2025, 08:17:02 PMI am looking for a 9 inch rearend housing for my son's 66 mustang. Does anyone have experience with the aftermarket units out there? He running a modified 289, nothing outrageous. Thanks
If you're in SF, there's a good shop in Livermore that does nothing but rear end work.
https://maps.app.goo.gl/Gj9jqAmccTnbLf8t5?g_st=ipc
There is a listing on Craigslist in Tucson, AZ for a 9" housing from a '65-'66 Mustang. It's not mine so check it out carefully but hopefully, a good lead for you.
Jeff
Thanks for the info. I forgot about the Livermore shop and the Currie set up is nice. Talked with the Arizona person and he will not ship. Also it has been re-welded for strength per him. Thanks again..
where are you located? I have a couple of the 1957 rearends available.
8 inch rear is 60 lbs lighter and there are now lots of options for gears and locking rears
Quote from: SFcarbuff on November 16, 2025, 08:17:02 PMHe running a modified 289, nothing outrageous.
Yes, and to be honest, a "nothing outrageous" 289, would probably do just fine with an "8-inch"; this as many have. ;)
But, if you feel that the project "needs" 31-spline axles, then a "9-inch" it shall be. :)
Scott.
Quote from: pbf777 on November 17, 2025, 08:32:28 PMQuote from: SFcarbuff on November 16, 2025, 08:17:02 PMHe running a modified 289, nothing outrageous.
Yes, and to be honest, a "nothing outrageous" 289, would probably do just fine with an "8-inch"; this as many have. ;)
But, if you feel that the project "needs" 31-spline axles, then a "9-inch" it shall be. :)
Scott.
65/66 Mustang with factory 9 inch rear end used 28 spine axles.
Quote from: Bob Gaines on November 17, 2025, 09:22:29 PM65/66 Mustang with factory 9 inch rear end used 28 spine axles.
Yes I do understand that. ;)
Rather, I was simply attempting to make reference to qualify what someone might consider "nothing outrageous"; and I chose the 31-spline axle as a possible analogy threshold for the reasonable application of the 8-inch axle unit, not an argument of actual fitment. :)
Scott.
Just here to second the idea that a 9 inch is really very unnecessary in a street car that doesn't either have massive tires on it, huge power, a very aggressive driver, or all of the above.
Know lots of vintage racers who are racing with 8 inch rears, same goes for drag racers. Less $, Less unsprung weight.
By all means, though, build it however you like. A 9 inch is a nice thing to have on the spec sheet when it comes time to sell the car.
Vern