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Diff housing differences and 3.08/3.27/3.45 gears 


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Posted: Wed Nov 09, 2005 12:50 pm 
ACT Cruise Moderator
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ACT, Australia

But even the EF and EL rear ends are different. As mentioned the mounting points are different. So best to replace with a rear end from the same model.



1998 DL LTD in Sparkling Burgundy, daily, 302W, stereo, slow
2006 BF GT-P in Ego, mods. Supercharged 5.8L all alloy modular

Posted: Wed Nov 09, 2005 12:56 pm 
Stock as a Rock
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Ride: ED XR8 Sprint

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The ED sprint diff has different trailing arm mounting points compared to other EA/EB/ED diffs. The bolt holes for the normal amrs are there just extra holes and geometry for the sprint. (an presumibly the EB GT.)



'94 ED XR8 Sprint

Posted: Wed Nov 09, 2005 1:33 pm 
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gogetta wrote:
data_mine : even tho the housings look basically the same its the internal differences that cause the problems.......

I think if u check the markings on the pinions and crown and carrier etc u will find 75 series (0575) markings on the ef/el 3.08 diff, the 78 (0578)..this will all be inside the housing...

75,78 refers to the diameter of the crown(I think) in inches...75=7.5 inches 78=7.75 inches so we're talking .25in (6.5mm) difference....f**k all difference to the casual observer...

so im trying to figure out which diffs r 75 and which r 78.......

as far as I can tell -
75 : ef/el 3.08

78 : ef/el 3.27/3.45
eb2 3.27/3.45

unknown -
ed 3.08
ea all

can anyone verify...

i'm wanting to do a gear swap aswell...tho i have the EBII with 3.27ss, so i'm figuring any of these 78series diff's are possible to fit into mine, altho...i thort that 3.45lsd diff internals couldnt fit into this type of diff? or am i wrong...haha probly



EB2 Turbo & BF Wagon

 Post subject: Re: Diff housing differences and 3.08/3.27/3.45 gears
Posted: Fri May 02, 2014 10:51 pm 
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Ride: Ford Falcon EL

Location: Mandurah
WA, Australia

Did you end up finding out what you had to do to get this to fit? I'm currently trying to do the same thing, but cant work out a baseline for machining the pinion bearing race. Started a thread but no replies as of yet. Thanks.
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