Diffs 8" or 9" - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Trans | Driveline
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 05-23-2003, 08:13   #1 (permalink)
Coupe XA
 
benXaGt's Avatar
 
Join Date: May 2003
Location: PERTH
Age: 30
Posts: 326
Diffs 8" or 9"

I've got an 8" diff any ways to beef it up a bit

Can it be made as strong as a 9" diff?
benXaGt is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 05-23-2003, 16:26   #2 (permalink)
Veteran Ford Member
 
Join Date: Jul 2001
Location: In a Dark Cave
Posts: 5,316
not without spending more that what a 9 inch costs.

A drum brake 9 er is quite cheap and easy to install. Even a disc brake conversions isn't that hard just the diff will cost more.
xacoupe is offline   Reply With Quote
Old 05-23-2003, 16:44   #3 (permalink)
ESP Man
 
shaynet's Avatar
 
Join Date: Apr 2002
Location: Gosford NSW Australia
Age: 61
Posts: 888
I remember reading an article in a Street Machine or Street Heat or Performance Buildups mag about a Melbourne or Victorian diff specialist that beefs up Borg Warners. Can't remember if cost was mentioned. Check around the diff specialists and they will know who it is.
The main thrust of the article was that a 9" is much heavier (tell me about it) and of course provided the BW doesn't break your 400 metre times should be less if your carting less weight. Also, it costs to have the 9" adapted to fit with brackets to be welded on to the housing for sway bars etc.
Ive done it but the car is definately harder to control in the wet once the rear breaks loose with the extra weight back there.
__________________
The cop said "Do you know why I pulled you over". I said " Well, that all depends on how long you have been following me!"
shaynet is offline   Reply With Quote
Old 05-24-2003, 01:04   #4 (permalink)
must stay under 0.25 ppd.
 
Join Date: Dec 2001
Location: Adelaide SA
Posts: 228
An 8 inch is not a BW diff. Its very close to the 9 inch actually. The main difference is really the size of the supporting housings. I dont think they made an original LSD with the 8" housing. The gear strength is the same as a 9" as is the basic axle strength but they only have 28 spline I think.
The BW on the other hand like from an XD ute can be built to hold 500 plus horses according to my trans and diff guy for a lot less than a rebuilt 9" disc LSD. I would have used one myself but I needed the weight.

Unless you need the weight use a BW LSD disc rear. Theyre a great rear for the money.
__________________
Well done SA pollies (for once). Hoon laws are long overdue to protect car enthusiasts against idiot drivers.
tonyk is offline   Reply With Quote
Old 05-24-2003, 03:35   #5 (permalink)
ESP Man
 
shaynet's Avatar
 
Join Date: Apr 2002
Location: Gosford NSW Australia
Age: 61
Posts: 888
tonyk,
So what did these 8" diffs come in. I have not heard about them.
While we are on the subject, are all BW LSD's the same e.g. are ute ones any stronger?
Also, any idea on the cost of a ratio change for BW LSD.
__________________
The cop said "Do you know why I pulled you over". I said " Well, that all depends on how long you have been following me!"
shaynet is offline   Reply With Quote
Old 05-24-2003, 04:17   #6 (permalink)
more power needed
 
Join Date: Sep 2002
Location: nth subs melb.
Posts: 76
If thats like xt diffs my mate can convert the centre to 9" internals
120why is offline   Reply With Quote
Old 05-24-2003, 04:34   #7 (permalink)
Registered User
 
Join Date: Jun 2002
Location: queensland
Posts: 1,134
Quote:
Originally posted by shaynet
tonyk,
So what did these 8" diffs come in. I have not heard about them.
While we are on the subject, are all BW LSD's the same e.g. are ute ones any stronger?
Also, any idea on the cost of a ratio change for BW LSD.
8" are basically a baby 9" as stated. BW LSD can be 25spline, 28spline, and then two or four pin. Beyond that, 2.77 ratio have a different offset to all the lower gears, and the hemisphere is therefore not interchangeable. Cost would be $770 retail for brand new LSD, then gears, etc. Someone on here recently tried to say a hemisphere from Ford is $550 retail, but that is crap. Retail at Ford is $1386, I checked last week.
__________________
If you're not driving a manual you're really just steering.
WBT56 is offline   Reply With Quote
Old 05-24-2003, 05:57   #8 (permalink)
Two SC 61's = trouble
 
ebxr8240's Avatar
 
Join Date: Jul 2001
Location: Penrith,nswAus/Morrinville.NZ
Age: 60
Posts: 6,360
The 8" you guys are mentioning.Is that the same as the Ford U.S 8.8 or is there another?

B/W and Ford 9" are totaly differant but the 8.8 is a modern [lighter]version of the 9" found in latter Mustangs etc..

IMO a 9" is too heavy, more to the point it's weight makes unsprung weight too heavy and realy upsets handling..O/k for all out drag car tho...
__________________
Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
.
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..
R.I.P Possum...
ebxr8240 is offline   Reply With Quote
Old 05-24-2003, 06:52   #9 (permalink)
Mustang Owner
 
Join Date: Sep 2002
Location: Bowen Mountain, Sydney, Austra
Posts: 358
ebxr8240,

Check out this site http://www.ridgenet.net/~biesiade/Fordrears.html

Early mustangs such as mine came with the 8" diff, which I always assumed to be the 8 3.4"(8.8). Looking at the website there, they look very much the same and it shows us how to pick the difference between them. There was an option for an LSD. Here is a list of ratios for a 66 model

2.83:1
3.00:1
3.20:1
3.50:1
2.80:1
3.89:1
4.11:1


I am pretty sure all early mustangs with the exception of Shelby's came with 8", Shelby were 9". As we can see the 8" offered quiet a few different ratios.
__________________
Used to be Mustang1966coupe.

Owns
66 Silver Frost Mustang 289 Windsor
71 XY GS Fairmont in Bronze Wine 302 Windsor
92 EB XR8 302 Windsor

Sure do love those Windsors
66_mustang is offline   Reply With Quote
Old 05-24-2003, 07:51   #10 (permalink)
Occasional Goat-Getter
 
Join Date: Apr 2003
Location: Sydney, Australia
Posts: 41
The benefits of a removable carrier (8 or 9) are chiefly the ability to change ratios by swapping centres or "pumpkins" as the US guys often call them, and (arguably) increased stability at launch due to a heavier rotating mass (gyroscopic effect).

Places such as Summit Racing sell gearsets for each of these, as well as the 8.8s. Trac-Loc centres, Detroit Lockers are available new; only the Trac-Locs are really suited for everyday use.

As to the BW diffs; when properly set up (too rare!), they are able to handle pretty tremendous power. Much less live weight, too. They don't have the cachet of a 9" which is fine by me - another reason to sleep easier at night.

To the original poster, Ben: Get onto some of the US sites like StangNet and post "Wanted" ads. Check out total freight costs beforehand... It may be cheaper or equal to ship a whole diff. Look for a whole diff or a fully kitted centre in carrier, with gears. People have a propensity to part them on ebay for max profits - very frustrating when you want the lot. And be cynical about any parts condition stated without good proof - better than being broken-hearted.

Adam.
addo is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Trans | Driveline



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
9" diffs FMXer's XF ute Trans | Driveline 5 08-19-2002 02:40
air lock diffs, I WANT 1!! XR8XTC The Pub 13 04-28-2002 02:11
Diffs ? xrfalcon Trans | Driveline 9 04-28-2002 01:22
Locker diffs Falchoon Trans | Driveline 3 09-26-2001 14:14

Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 22:47.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.