Brought to you in part by:

M&M Restoration & Tool Supply Store

Great deals on auto restoration supplies!

.


NOTICE! The old Mustangsandmore.com is a read-only archive.
Currently the Search function is inoperative, but we are working on the problem.

Please join us at our NEW Mustangsandmore.com forums located at this location.
Please notice this is a brand new message board, and you must re-register to gain access.

  Mustangsandmore Forum Archive
  '69 to '73 -- The Musclecar Mustang
  Shortening a 9" axle

Post New Topic  Post A Reply
profile | register | preferences | faq | search

next newest topic | next oldest topic
Author Topic:   Shortening a 9" axle
Barry70Stang
Gearhead

Posts: 306
From: West Monroe, La USA
Registered: Jan 2006

posted 10-24-2006 09:07 AM     Click Here to See the Profile for Barry70Stang        Reply w/Quote
I have got a 9" axle housing from a truck that I am going to have shortened for my 70. Does anyone know how much I have to shorten each side? I did some measuring in my 8" and it looks like there is a 2.5" difference, with the passenger side being the longest. As best I can measure, it looks like the overall flange to flange measurement is 53.5. Any advice to keep me from making a mistake would be greatly appreciated.

Thanks,

Barry

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 10-24-2006 07:54 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
Why not just make it as wide as your 8" housing? You know that works.

------------------
'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

Barry70Stang
Gearhead

Posts: 306
From: West Monroe, La USA
Registered: Jan 2006

posted 10-24-2006 09:10 PM     Click Here to See the Profile for Barry70Stang        Reply w/Quote
Well, is it just that simple Steve? I spoke with a gentleman at Strange today and he had several questions about the brakes that I wasn't sure about. I had planned on going back with the truck brakes since I have the backing plates that go with that axle housing, but is there any reason that I couldn't just make a flange like my 8" axle has and weld it to the axle and use my existing brakes? Or can you buy those flanges? He seemed to be concerned about getting the axle lengths correct. If I could use my brakes it would save me a chunk of change. If I make the axle the same 54 1/8" as my 8", I should be able to just order stock length axles, Correct? Is there any difference between the 8" and 9" stock axles? Sorry for sounding so ignorant, but there are a lot of variables here and I don't want to screw up. Do you happen to know the lengths of the two axles? If I knew that for sure, that would tell me how much longer to make one axle tube than the other, correct? Thanks Steve, sorry you get the questions that no one else wants to answer. LOL

Barry

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 10-25-2006 10:28 AM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
I don't know the axle lengths, sorry.

Let me ask a question. Instead of going to all the expense and trouble of narrowing a rear housing, then welding on the perches you need and making sure the pinion angle is correct, why not just get the right axle in the first place?

Unless I was building a tubbed pro streeter or drag car that's surely the route I'd take.

------------------
'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

Barry70Stang
Gearhead

Posts: 306
From: West Monroe, La USA
Registered: Jan 2006

posted 10-25-2006 10:57 AM     Click Here to See the Profile for Barry70Stang        Reply w/Quote
Trying to save a few bucks! I am leaning toward ordering a housing that is ready to go.

Thanks,
Barry

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 10-25-2006 12:12 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
That's not the way to save, machine work is expensive.

------------------
'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

Barry70Stang
Gearhead

Posts: 306
From: West Monroe, La USA
Registered: Jan 2006

posted 10-25-2006 05:58 PM     Click Here to See the Profile for Barry70Stang        Reply w/Quote
I've got a friend with a machine shop, he said he would cut it to the correct length and weld on the spring perches for $125. I have the pumpkin, know where I can get a Ford factory limited slip for $100. Would have to buy the axles, gear set, installation kit, and brakes. I would come out much cheaper this way (I think) but I'm a little hesitant about building it. Won't cost me anything to set it up.

68 Coop
Gearhead

Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004

posted 10-25-2006 10:58 PM     Click Here to See the Profile for 68 Coop        Reply w/Quote
Couldn't you pick up some stock axles first, then you'll know exactly how long the tube will have to be for it to work??? Makes more sense than cutting it first, have a big OOOOPS, and have to start over.

------------------
William
M&M# 4256
MCA# 64831

68 Coupe
289
C4
3:55's/Trac-Lok

Barry70Stang
Gearhead

Posts: 306
From: West Monroe, La USA
Registered: Jan 2006

posted 10-26-2006 06:44 AM     Click Here to See the Profile for Barry70Stang        Reply w/Quote
I wonder if there is a difference in the stock 8" and stock 9" axles? I figure there is a little difference because the 9" is just physically larger. I got under the car last night and did some measuring. There is a 2.5" difference in the length of the axle tubes. I measured from the back of the flange to where the tubes are welded into the housing. I've got a friend with a 9", I'll go measure his before I do any cutting. William, the only thing I can think of that would make the stock length axles not work is if the truck brakes are substantially wider, and I am going to research that.

Thanks,
Barry

68 Coop
Gearhead

Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004

posted 10-26-2006 08:21 AM     Click Here to See the Profile for 68 Coop        Reply w/Quote
This is a good read Barry, and it should be useful if you need it again.

http://kevinstang.com/Ninecase.htm

------------------
William
M&M# 4256
MCA# 64831

68 Coupe
289
C4
3:55's/Trac-Lok

Barry70Stang
Gearhead

Posts: 306
From: West Monroe, La USA
Registered: Jan 2006

posted 10-27-2006 05:08 PM     Click Here to See the Profile for Barry70Stang        Reply w/Quote
Well, the decision has been made. I ditched the idea of shortening the truck axle in favor of building up the 8" that is in the car. I ordered a Richmond "Loc Right" positive traction, a set of 3.80 gears, an installation kit with all new bearings and seals. I hope I don't regret it. I'll keep looking for a used housing and eventually build the 9" 3rd member that I have.

Barry

All times are ET (US)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply
Hop to:

Contact Us | Mustangsandmore Front Page

Copyright 2006, Steve LaRiviere. All Rights Reserved.


Ultimate Bulletin Board 5.47d

Amazon Honor System Click Here to Pay Learn More

[Build a free Mustangsandmore.ws Home Page!]

[Posting Pictures]

[About M&M][Members' Pics]

[M&M Conventions] [M&M Mug Shots] [Tech Articles]

[M&M Bookstore] [M&M Restoration & Tool Supply Store]