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changing diff gears 

 

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 Post subject: changing diff gears
Posted: Mon Aug 27, 2007 10:17 am 
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gday all, am looking to upgrade my diff from the stocko 3.23 to something higher. i was thinking 3.7 but im a bit worried about fuel consumption on the high way i dont want it to be to redeculous but am prepared to pay a bit more for the extra go. would this chioce be a bit to high? should i just go with 3.45.
any adive is good advice
cheers

 

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Posted: Mon Aug 27, 2007 2:16 pm 
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ok.... are 3.7 diff gears going to be daily driver friendly or a bit over the top??
cheers

 

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Posted: Mon Aug 27, 2007 7:32 pm 
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dude for an auto 4.11's isnt overkill......not in my opionion... considering i still sit on 2250 at 100km/h

Economy barely moved.

 

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Posted: Mon Aug 27, 2007 11:59 pm 
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ask anyone that actually has 3.9 or 4.11 diff gears and theyl tell you that they get better city fuel economy. over all it shouldnt move to much but if you do heaps of free way driving you might notice a little diffrence

 

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Garrett gt40turbo, iceman plenum, ported head, turbo cam, double valvesprings, 023 fuel pump, 36lb injectors 4' cat, 4' dump, 2.5 exhaust, build bottom end, hypertonic pistons rods & rods, king bearings, j3. c10 3500 stall
232rwkw@4psi

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Posted: Tue Aug 28, 2007 12:05 am 
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4dlvr wrote:
ask anyone that actually has 3.9 or 4.11 diff gears and theyl tell you that they get better city fuel economy. over all it shouldnt move to much but if you do heaps of free way driving you might notice a little diffrence


Exactly right! I think overall my Economy is actually better.

On the highway my Economy went from around 8L to 9L per 100L

Around town in the low 13's

 

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1994 ED Fairmont Champaign Gold - AU Series II Intech 4.0L - EL EFI - Thermo Fans - 4.11 LSD - Pacemaker 4480 Into Custom 3" Exhaust - Shift Kit
In Progress: EL 4 Speed Auto- 3000 STALL - To be fitted
EF Tickford Race Spec Head Port- In the shop
Custom SureCam - Chiptorque

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Posted: Tue Aug 28, 2007 4:29 am 
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thanx guys, i think ill get them 3.7s.... is 250 a reasonable price for just the gears?

 

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Posted: Tue Aug 28, 2007 8:28 am 
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3.7 is the top choice for manual if its auto i wouldnt bother unless it was 3.9/4.11
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Posted: Tue Aug 28, 2007 1:23 pm 
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ahh sweet then cause mine is a five speed, how is it with gear changing?? 1st would be fukn short aye??

 

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Posted: Tue Aug 28, 2007 5:47 pm 
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all your gears will be noticeable shorter, youll need grippy tires to avoid wheelspin during gear changes

 

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Garrett gt40turbo, iceman plenum, ported head, turbo cam, double valvesprings, 023 fuel pump, 36lb injectors 4' cat, 4' dump, 2.5 exhaust, build bottom end, hypertonic pistons rods & rods, king bearings, j3. c10 3500 stall
232rwkw@4psi

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Posted: Wed Aug 29, 2007 12:07 am 
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3.7's are great in a 5 speed , best mod i've done, my car sits on 2850rpm at 120km/h.

 

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 Post subject: ef 4.11
Posted: Wed Aug 29, 2007 12:41 am 
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I recently fully rebuilt my diff, 4.11 + lsd, best mod i've done..... drivability is awesome, economy @ cruise is awesome, around town, not so good, my trip says around 22L per hundred...... thats on 98 oct and driving it no harder than half throttle, ON MY E PLATES!!!! shifting can feel a little soft sometimes and sloppy(4spd in perfect cond, brand new oil + filter + external oil cooler fitted)

I have corrected my speedo the pcm sometimes trips out and no u can't just buy a speedo gear,you need to buy or build a speedo signal corrector, and if u hold it flat stick it bounces on the rev limiter in first have to back of to change and sometimes hit rev limiter in second.

Also noticed i have killed a universal join in the first 3 weeks of driving.

Also noticable diff a*** whine @ 75-80km/hr.(NORMAL)

Fairly difficult to set up 4.11's in your borg warner diff @ home, NOT COMMOS but falcons are. unless u buy the new a*** off the shelf you don't know what u are gettin, i spent about 3 hrs sorting out my pinion shim wich ended up being huge, like 5.5mm... normaly .4mm or something.... most diff shops won't touch second hand a***.

wish i did this on my xf when i had the 4.0l + 5 SPD in there.

Need any info give us a yell, done a few.

Muff
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Posted: Wed Aug 29, 2007 9:02 am 
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ebfairmont3.9 wrote:
dude for an auto 4.11's isnt overkill......not in my opionion... considering i still sit on 2250 at 100km/h

Economy barely moved.


no way known are you sitting on 2250rpm @ 100 with 4.11's.

 

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Posted: Wed Aug 29, 2007 5:21 pm 
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lol havent we been over this one like a 1000 times?

 

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