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Difference in diffs ED to EA 


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 Post subject: Difference in diffs ED to EA
Posted: Mon Aug 15, 2005 4:43 pm 
Parts Gopher

Age: 33

Posts: 90

Joined: 5th Nov 2004

Ride: EA II S-Pac

Location: Bendigo
VIC, Australia

Hi all...

Just had a new diff put in my car... Its from an ED. (My cars an EA S)

The car seems to pull a lot harder however, doesnt seem to have as much pickup as before. Would it be the Diff that has caused this>

At the same time as the diff, i also had the head replaced due to a rather large crack.

I think, but correct me if im wrong that a new head should not have this affect.
Posted: Mon Aug 15, 2005 5:03 pm 
Parts Gopher

Age: 30

Posts: 51

Joined: 7th Dec 2004

Location: Bairnsdale
VIC, Australia

the ed diff may have different gearing to the ea which could effect the way your car excelerates
Posted: Tue Aug 16, 2005 7:54 pm 
Technical Contributor
User avatar

Posts: 2799

Joined: 6th Nov 2004

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Ride: Falcon

Location: Sydney
NSW, Australia

EAs had a low gearing diff... eg a 2.97:1 in a fairmont ghia manual... and they were 25 spline. The EDs are 28 spline, and are a minimum of 3.08 for the base models. But depends on the model...and the engine... if its a V8 LSD, it'll be a 3.27:1 V8 diff, with the XR6 LSDs, or the Fairlanes, and Fairmonts with LSD it was a 3.23 (i6).
So I would say that the gearing has changed.
Did you change the drive shaft aswell? or the flange on the diff?

As for the head... EFs had a better flowing head, but unless its an XR6 head, it shouldn't make that much of a difference, unless the crack was a substantial power loss.





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