Im looking for pictures of the 9inch diff without the diff mount.
The interresting bit is what it looks like behind this mount as on the wrc cars they machine away those tapets.
Im about to buy a 9inch from a wrc car but i need to use the gpa diffmount on my car.
So i need to know if it is much hassle to fix, or maybe bara exchanges lids?

 

mark , im sure oppelinger motorsport who post on here sell the casings ect ,


just another option if barra cant help


beef

 

Hi,
Had the same problem on our car. Ours had been hacked off so milled it flat and put two m10 threads in the cover. And take the distance up with a spacer. Al try and get a photo sorted over the weekend

cheeRS jim

 

Beef thanks for the advise.

Jim that would be much appreciated

 

mark

heres our rear rear diff cover,hope it helps

DSCF0193.jpg?t=1293198273

is it a gpa car youve got?

 

Thats perfect Jim, thanks.

its for my focus with gpa rear end
https://passionford.com/forum/restor...ian-focus.html

 

that looks a bit like the 8.8 that i have in my kitcar, have you got a less close up pic, where do these 9" diffs come from originally, i know the americans fit the 8.8 just wondering if it is the 8.8 and its just called a 9" over in uk

 

DSCF0155.jpg?t=1293298175

as far as i know these were only built for motorsport by FF DEVOLPMENTS for ford

 

it is similar to the 8.8, but i guess different, why don't uk people fit the 8.8 like the americas do to the xr4ti, its a sierra, but badged as a murker, with the 8.8 its cheap, strong, hundreds of ratios to choose from, and maybe 20 different LSD's to choose from depending on use and price range, is available in front axle setup as well with normal rotation, or reverse rotation i believe, just seems mad using such an expensive part when a just as good factory ford part is available with more options and cheaper, only guessing the cheaper and options bit, but as its for a cosworth my guess is they think of a number and times by 10 and add a zero to come up with the price.

how the 8.8 is fitted http://www.key-ideas.com/DGKurTwo2-040604-8.8LSD.html

Ł830ish for complete new 8.8 with 3.55 ratio and LSD, should be good for way more HP than any cosworth can chuck at it.
http://cgi.ebay.com/ebaymotors/NEW-0...Q5fAccessories

 

i've got a pic of a solid mount rear plate where the plate and diff mount are all cast in one, so you literally bolt the diff cover to the diff, and then the cover to the underneath of the car

can't find the pic though but i'm sure someone will know what i'm on about

 

Think I know the 1, done by gartrac at the time I think. Was only for a 7.5 inch though???

 

not sure, but i'm fairly certain it could easily be replicated by the likes of cdf as a plate that sits ontop of the original diff plate bolts and bolts to the car without the need for a diff hanger

in fact, you could make one side for one, one side for the other and the bit that goes in the top and it could all simply bolt together along the top somewhere, just need some longer bolts for the diff cover plate and job jobbed

 

Is this the sort of thing your on about Dojj?

http://www.osenworks.no/2008/reardiff.jpg

 

that's the one

always wondered why they didn't do that as an option to get rid of all these diff hanger issues

 

That's it. Ideal for grpn/standard cars. No gud for grpa mounts different in the shell. HUD mod to do is fit the upper front mount when using a grpa beam, had these Diffs twist out the beam! Hard to get hold of so we had to fab one up

 

How do you get the driveshafts to fit on a 8.8 diff?
Rich

 

don't know, at a guess as its seems to be a common conversion in the states, the original drive shafts may fit, are the sierra shafts stubby bit that the main shaft bolt to 28 spline by any chance, or 31 spline

 

looks like u use mustang cobra shafts with cosworth ends at the wheels end, maybe it would be a little costly by the time its all done, but it would be very strong, here is the cobra shafts next to standard cosworth ones, i'm using the 8.8 and cobra shafts in my kit so took a photo of the difference compared to cosworth, photo doesn't show it very good, but the cobra are about 2x the thickness of the cosworth shaft

cobra is the new shaft and the cosworth is the old shaft

 

think the sierra ones is a 26 spline, but don't quote me on that as it's been a while since i counted them

 

So does the cobra drive shaft slide into the 8.8 diff and then you use a cossie CV at the wheel end so it fits?
Cheers Rich

 

yes it just slides in and i guess from what i read about changing the end by the wheel that must be the only bit you change, don't know if that would be the weak link then, i have seen uprated cobra shafts rated at 900hp, and being america that would more than likely be 900 at the wheels

 

What sort of price are the cobra shafts?

 

they are a lot, but you buy the diff and shafts and everything as a package, i'll look for a price, although you can buy a complete rear IRS setup from a used car, for good money

here are a few complete setups from scrap cars, the 03/04 cobra was the supercharged 400+hp car.
http://cgi.ebay.com/ebaymotors/03-04...Q5fAccessories

http://cgi.ebay.com/ebaymotors/03-04...Q5fAccessories

http://cgi.ebay.com/ebaymotors/03-04...Q5fAccessories

http://cgi.ebay.com/ebaymotors/FORD-...Q5fAccessories

 

this is where i got my stuff from.

http://www.fortesparts.com/product_i...roducts_id=229

but can't find the shafts

ford explorers over in the states has the same IRS, here is an open diff one very cheap, but you maybe

http://cgi.ebay.com/ebaymotors/Explo...Q5fAccessories

but if the explorer has irs in the states, maybe it has irs in uk, and you would be able to get the parts from a late scrap explorer.

 

looks like the explorer option is out, they got irs in 2002, ford stopped selling them in 2002 so i guess the irs explorer never got to the uk, thunderbird irs is the same, so lots of options though

 

was a guy that made yokes so you could use std. 2wd driveshafts

mike rainbow knows him me thinks.david godfrey or Tim Roman is the name.

 

The Ford 8.8" IRS was done into an extremely small number of US XR4Tis---and they were incredibly expensive to do the conversion.
Clearly no thought was given to "productionising" the swap.

The IRS 8.8 has a number of problems: It's BIG and WIIIIIDE, the output things are cups for plunging tri-pode bearings--like the front of Sierra 4x4---, the diffs are crap with only 2 planet gears (although better--but still 2 pinion---diffs are available for less that $300)

The "cup for plunging tri-bearing" and the width cause the main problems of how to mate the half-shafts inner CV up.

The solutions were custom dhalf-shafts and custom output flanges for the real bargain, oh I'm gonna rush out today and buy an 8.8 for $50 price of around 1200 bucks US..

That is absurd right there.

I read you must buy some special diff cover in cast alloy for the mount up---another mere $175

All told I've read---obviously I have followed the madness---as it is indeed madeness----and seen people talking the total cost of the "easy and cheap" Ford 8.8 costing over $2000 to do..
Bugger that!

I looked at and rejected the idea--pulled one of the units out of a fresh crashed Thunderbird--back in 1989 and saw too many problems requiring too many dollars to overcome them..

And started look at the uber-strong, 4 pinion diff multi-disc LSD in the heavy and powerful 3 liter turbo Supras.. Heavy stresses geas, and power stresses gears, and the US versions of the MA70, MkIII Supra are 3,0 or turbo power and huge barges weighing in the mid 3000-lbs range. And time have proven their 8" unit to be fine even in high budget modded drift-o cars with claimed 700 bhp...
No problems...

Seems the everyman's solution...

There's even a kit to stick 'em in very affordably.


Nope the 8.8 is big, and bulky and even those whop have them in our XR4Tis have said, "I wouln't do it again---I'm thinking of the Supra conversion"..

 

all i know is from looking into it, they are plenty strong enough for a cosworth application and as they are readily available good used with drive shafts and factory lsd (not the best lsd), and the info is online to do the conversion, with the number of options in ratio and lsd, it would be a good option, they can't be any bigger than the 9" thats being used in the high end conversions, if the wheel end is the only bit that needs changing, the shafts can be made the correct length at the same time, doesn't seem a bad idea to me, i have the setup in the back of my kit, and will be using the 8.8 front out of a lincoln navigator to give me 4x4 next year