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Diff housing differences and 3.08/3.27/3.45 gears 

 

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 Post subject: Diff housing differences and 3.08/3.27/3.45 gears
Posted: Tue Nov 08, 2005 12:49 am 
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1. r all ford housings the same (EA-EL)?

2. can all diff centres be swapped around (I know about 25/28 spline differences so dont confuse)

the 3.45/3.08 question...
3. specifically can a lsd centre with 3.45 gears fit into an ef/el 3.08 diff housing...

seems to be a lot of conflicting info out there...

 

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Posted: Tue Nov 08, 2005 4:07 pm 
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it seem that the ef/el 3.08 diff is actually a BW 75 series......while all the others eg ea-ed, ef/el 327 345 r 78 series..

right..

what about the 277 292 ea diffs r these 75 or 78?

why would ford change the series like that....or is it to do with the compatablity of ratios..

 

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Posted: Tue Nov 08, 2005 5:41 pm 
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I changed my diff recently from a 3.08 to a 3.45 and took pics.

Image Image
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Spot the difference, no neither can I (apart from one's old and dirty and unpainted).

Oh, don't forget to change your speedo sender too.
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Posted: Tue Nov 08, 2005 7:09 pm 
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hmmm do they do fit
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Posted: Tue Nov 08, 2005 7:36 pm 
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sorry to hijack your thread gogetta but im looking to put a slipper in my car soon currently have a 3.08ss. what ratio could i go to without any hassles ie a straight swap? thanks boys i got no idea bout diffs

 

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Posted: Tue Nov 08, 2005 8:02 pm 
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basically 3:08 can fit 3:23 and 3:45 gears
BUT you have to machine the shims and bearing cups to make them fit
quite a bit of work to get right.

whereas a 3:23 housing will take 3:45 gears no problems at all

internally the 3:08 is smaller

hope this helps
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Posted: Tue Nov 08, 2005 8:23 pm 
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Also remember the EL housing has different mounting holes and the watts link pin is different. If anyone wants to put a pre EL housing into an EL it is a lot of work.

 

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Posted: Tue Nov 08, 2005 8:25 pm 
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you can put an ef diff into an el but you need to change upper arms and handbrake cable!

 

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Posted: Tue Nov 08, 2005 8:41 pm 
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But then you end up with EF geometry, and EL is better.

 

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Posted: Tue Nov 08, 2005 9:45 pm 
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Brett 4777 wrote:
basically 3:08 can fit 3:23 and 3:45 gears
BUT you have to machine the shims and bearing cups to make them fit
quite a bit of work to get right.

whereas a 3:23 housing will take 3:45 gears no problems at all

internally the 3:08 is smaller

hope this helps


so if i was to change diffs would it be better to do a straight axle swap?

 

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Posted: Tue Nov 08, 2005 10:20 pm 
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your axles will still fit
but complete diff with axles is always easier to fit
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Posted: Tue Nov 08, 2005 11:10 pm 
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Brett 4777 wrote:
but complete diff with axles is always easier to fit


Yep, and no messing around with ensuring you install the centres properly (re: shimming and such).

 

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Posted: Wed Nov 09, 2005 2:46 am 
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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...

 

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Posted: Wed Nov 09, 2005 2:49 am 
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Brett 4777 wrote:
basically 3:08 can fit 3:23 and 3:45 gears
BUT you have to machine the shims and bearing cups to make them fit


what exactly has to be machined?

pinion bearing cups/shims or carrier? or both?

 

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 Post subject: ???
Posted: Wed Nov 09, 2005 12:12 pm 
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Remember that EF/EL have a drum hand brake and EA/EB/ED have diskbrake operated handbrake. So hand brake cables are different etc, also brake pressure line comes to the center of the diff and runs to each brake EF/EL run brake line to one side and across the axle to the other. So you have to run a different brake line from the front of the car.
Another thing brackets need to be fitted to chassis for h/b cable and center mounted h/b in cab needs floor mods.

 

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