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| TROYMAN |
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it says that but 3.45 didnt come untill edxr...
its a eb xr6 diff and unless its been changed it would have 3.23. remember these cars are now over 15 years old and people change ratios. i have on the last 2 falcons i sold! the tag still read 3.08 and it had 3.45 anyway it doesnt matter what car its from just dont buy one unless your 100% sure of the ratio.. i got sucked in 2 years ago and brought a diff from the wreckers and it had the 3.45 ratio tag and when i opened it up it had 3.27 ratio.. and i saw the car it came out of (ef xr6). |
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| cjh |
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{USERNAME} wrote: That is most interesting, I didn't think of other models with BW diffs.. it need not be a falcon... cool.
FWIW my diff has two plates on it, the one on the filler says: Spin Resistant Diff as approved by blah blah blah.. so I'm assuming spin resistant is ford speak for limited slip... The other plate has "Ratio 3.23" and P/N 90DA-4005-AB written on it. (the 4005-ab part was faint so it might be different but the rest was exact) So now I know my ratio, and I'm presuming, my model number. My workshop book says that the 2 and 4 pinion single spinner are called the 75 or 78 series respeectively.. It doesn't mention the LSD model but I'm guessing it's 90..  So.... are any of the centers interchangeable, or must I look for the exact same with a different ratio? rgds Frank OK, I have fitted in my 88EA, an EBII diff housing, with the EBII 3.27 gears ( that had an open centre 28 spline 4 pinion). Now I took my OE LSD centre ( had 2.92's) 2 pinion 25 spline, and bolted the 3.27 gears to it. I have also fitted my OE axles & brakes. I made spacers out of alloy to keep using my lower trailing arms for the EBII diff housing. I used this housing for the fact that I can change my diff oil without taking the back cover off to change the diff oil. One thing to look out for is the diametre of the ring-gear. The Aussie built Jap cars use BW diffs, so some of them are too small to fit a Falcon centre & housing. I am not to sure about this, but I haven't got to see it for myself yet, but apparently, you can't use a centre from a 2.77 geared diff on anything lower geared than that, ie: 2.92, 3.23, 3.27, 3.45, 3.7, 3.89, 3.90, 4.11, etc....
_________________ http://youtu.be/jJTh9F3Vgg0 |
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| frankieh |
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Quote: its an S XR6 diff
Don't understand what you mean..... |
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| frankieh |
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Ok, now I see... so it can't be an S pack, at least not a standard one.
sigh,, can't ever be easy or cheap...
sigh... all I want is to lower my gearing from 3.22 to 3.45 3.9 4.1 or whatever... Have any of you guys heard of a BW 90 series? |
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| frankieh |
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I did some googling for 90 series BW and only found one reference to it in a CAMS pdf file as an accepted Diff.
Seems it is way rairer than the 75/78 series.. does anyone know anything about them? I ask because my manual covers only 75/78 and google has nothing i could find on the 90 series either..specifically I want to know about it's innards so I can go looking for a new center. rgds Frank |
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| 67RCE |
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If im right they are the 75 series in the EA1, and 78 in EA2-EL including the LSD's
_________________ ILL60 - EF XR8, Sunroof, Ticky Kit, 19x8.5/19x11 TE37's, 347, AFr185's, TFS BoxRcustom converter, Hurst Quarterstick, huge billet cam. |
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| TROYMAN |
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woops
Last edited by TROYMAN on Thu Jan 17, 2008 9:25 am, edited 1 time in total. |
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| TROYMAN |
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{USERNAME} wrote: If im right they are the 75 series in the EA1, and 78 in EA2-EL including the LSD's
thats pretty close.. from the early x series(not sure about xa/xb/xc). but xd/xe/xf-ea2 is 75 series(even chrysler valiants) and( some holdens but not sure if holden used 75 or 78 series). and eb1 - au have 78 series. there are alot of cars out there that use the bw 75 and 78 series.. just have a look and you will be suprised.. some mitubishi vans.nissan r31 skyline/pintara and some commodore (not exactly sure what models coz they are s**t)lol has bw aswell.. i know there is more..i cant think of them all at the moment |
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| frankieh |
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hmmm, its definately a 90 series... so what the heck is it?
This is the relevant line from the cams manual relating to EA and VN. Quote: VN/VP Commodore: Only the T5 manual five-speed Borg-Warner gearbox as fitted by GMH as original equipment may be used (Production option M78-V6). EA/EB Falcon: Only the T50D (Part No. 87DA-7003-AA, 87DA-7003-AB, 90DA-7003-AA, 91DA-7003-BA) manual five-speed gearbox as fitted by Ford Motor Company as original equipment may be used. " The whole thing is here: (google html version) [url] http://209.85.173.104/search?q=cache:hk ... =firefox-a [/url] If they are that unknown, perhaps I should be looking at a whole diff rather than just the center...[/quote] |
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| frankieh |
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actually, I just read that again.. and it seems to be referring to 5 speed gearboxes... why would it say that on the side of my diff. (not the exact same, bit the 90DA part.)
This is nuts.. has anyone else got a late 90ish EA ghia? if so, what does you diff say? |
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| TROYMAN |
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{USERNAME} wrote: hmmm, its definately a 90 series... so what the heck is it? [/quote]
This is the relevant line from the cams manual relating to EA and VN. Quote: VN/VP Commodore: Only the T5 manual five-speed Borg-Warner gearbox as fitted by GMH as original equipment may be used (Production option M78-V6). EA/EB Falcon: Only the T50D (Part No. 87DA-7003-AA, 87DA-7003-AB, 90DA-7003-AA, 91DA-7003-BA) manual five-speed gearbox as fitted by Ford Motor Company as original equipment may be used. " The whole thing is here: (google html version) [url] http://209.85.173.104/search?q=cache:hk ... =firefox-a [/url] If they are that unknown, perhaps I should be looking at a whole diff rather than just the center... when you say 90 series do you nean the prefix 90da if so that prefix is pretty much the year of manifacture not the series of the diff centre.. or gearbox |
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| TROYMAN |
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if your car has the original factory diff you can get a rough idea what series it is by looking at the flange on the tailshaft..
if it has a round flange on the diff with 4 m10 bolts. its more than likely a 78 series diff. also look at the bottom bolt bolt on the diff cover it should be a drain plug.. and if it has a flange with 2 hoods and 4 small 1/4 " bolts and it doesnt have a drain hole its more than likely a 75 series diff. but in saying that both housings can use both 75 and 78 series centres.. otherwise take your diff cover off and look on the ring gear it will have the series and the ratio stamped on it.. |
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| frankieh |
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Got some photos so the experts can see what it is..
From your description, this is a 75 series yes? That would be a good thing for finding a cheap 3.9-4.11 LSD center wouldn't it? Before I get carried away, I should wait for the expert analysis. Whats the word? |
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| TROYMAN |
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gday
thats a ea 75 series diff... and looking at the pics it looks original.. the only set back is the 25 spline axles.. where as the 78 series has 28 spline axles (stronger)... what is written on that small tag? i think the tag should have the series on it aswell as the ratio... |
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| frankieh |
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I'm fine with it being a 75 series because I can't see an NA i6 ED motor some strags and a cam having to much power for it.
Am I right? I'm a little annoyed because I was offered the whole ED Fairmont that my motor came from and I didn't take it. I should have at least checked the diff ratio on it, but didn't know what I wanted at that stage. With a 75 series and 3.23:1, does that mean that if I found a Pintara lsd with 4.11 I could just swap the whole center in? rgds Frank |
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