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Is EA 2.77 diff strong enough for 5.0L engine? 

 

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 Post subject: Is EA 2.77 diff strong enough for 5.0L engine?
Posted: Mon Jul 17, 2006 4:26 pm 
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Converting EB 5.0l V8 from BTR 4 spd auto to C4 3 speed auto.
I was thinking about using an EA 2.77 diff so fuel economy doesn't suffer, is it strong enough? has anyone tried it?

 

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Posted: Mon Jul 17, 2006 4:44 pm 
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depends, are you going to do burnouts or flog it? if no then yeh the EA diff should be p to the task. If yes your results may not be so good. Why are you going to a C4?

 

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Posted: Mon Jul 17, 2006 4:48 pm 
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Strength reliability (and cost, race-prepped C4 = a grand stock BTR = 2 grand) and the fact that a C4 is the same lenght & spline as BTR, so conversion is simple & cheap.
sick of breaking BTRs and paying $1800- $2k each time.

 

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Posted: Mon Jul 17, 2006 4:59 pm 
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hey compactcoupe what you got? im just down the road from you in glenbrook

 

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 Post subject: What I Got
Posted: Mon Jul 17, 2006 5:09 pm 
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EB 5.0l Fairmont Ghia, White. Nice 'Zorst, Tint, Big Sound, Very Ordinary 16's, and even more ordinary Paint. What you got?

 

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Posted: Mon Jul 17, 2006 5:43 pm 
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got an ED fairmont 4 litre. biscayne blue, 17 au2 xr rims, 5 speed and a few other bits and pieces. you might have seen me crusing around the area....

 

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Posted: Mon Jul 17, 2006 6:39 pm 
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If you keep killing BTR boxes (im assuming its not through neglect) the EA axles may not go so well, there are a few people around who can rebuild a BTR box much stronger than original (XR6T bands etc)

 

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 Post subject: Know of any way to get a stronger diff?
Posted: Mon Jul 17, 2006 6:43 pm 
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if EA ones no good, probably should go stronger anyway, but don't want to bash floor in for a nine inch, any idea what's a strong, easy fit?

 

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Posted: Mon Jul 17, 2006 6:55 pm 
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i think you may be able to fit the EA diff gears into an EB+ housing (using its centre) that way you get high gearing, and the stronger axles.

 

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Posted: Tue Jul 18, 2006 12:19 am 
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Want to buy a used BTR for the 5.0L as removed from my EB when i did a T5 conversion?? (& I'm just up the road in Faulconbridge).

Not sure what you are doing to break the BTR's, but stepping down to a 25 spline axle (as found in EA's & 6cyl EB1's) from the stock 28 is not a good idea. Perhaps a 3.08:1 28 spline 4 pin centre from a 1990's Commodore put in your housing will achieve the desired effect behind the C4.

 

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 Post subject: Box car meet
Posted: Tue Jul 18, 2006 4:17 pm 
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Well as I see there is at least 3-4 EA-ED's in the Penrith Blue Mountains area so we should get a Box car meet @ Penrith or Springwood Rd.

 

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Posted: Tue Jul 18, 2006 8:35 pm 
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Sounds like a good Idea, always good to catch up with local falcon boys.

 

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Posted: Tue Jul 18, 2006 8:37 pm 
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Thanks anyway on the btr offer, but I'm also getting the C4 in preparation for the long term goal of a 500-600hp efi boss motor, which a btr will definetly not cope with!

 

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Posted: Tue Jul 18, 2006 9:02 pm 
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In that case even the 28 spline borg warner will only survive for so long.
Long term you will need a 9" conversion, or billet axles for the 28 at the very least.

& a mini meet after hours sounds good.

 

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Posted: Wed Jul 19, 2006 9:01 pm 
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ah bugger,,i used to live in springwood,,warrimoo and bleakheath,,ah i miss the mountains.

 

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