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3.7 Diff gears 

 

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 Post subject: 3.7 Diff gears
Posted: Mon Feb 27, 2006 6:51 pm 
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i have a lsd 3.45 diff atm, can i just swap the 3.45 internal gears to a 3.7 internal gears?
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Posted: Mon Feb 27, 2006 6:57 pm 
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good luck with fuel
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Posted: Mon Feb 27, 2006 7:55 pm 
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I dont know if u can swap them or not, but dont be detered by southy too much, I went to 4.11 and it didnt break the bank,

 

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Posted: Mon Feb 27, 2006 8:44 pm 
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Quote:
good luck with fuel


no change in fuel economy here mate, not a noticable change anyway, i went from 3.08 to 3.73
sits on 2300 at 100km/h.

 

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Posted: Mon Feb 27, 2006 11:34 pm 
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how out of whack can the speedo get with 3.73:1 gearing? I was keen on this awhile back and if the acceleration improvement is noticable, I'll go get it done in the next 2 weeks.

 

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Posted: Mon Feb 27, 2006 11:41 pm 
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The speedo will be out by a fair way, with 4.11 it shows 140 when Im really at 100, but the difference is not flat. But all that aside u can just buy the speedo gear from ford to fix it up.

 

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Posted: Tue Feb 28, 2006 12:05 am 
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i'm hijacking the thread again, but where does the speedo gear go?

 

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Posted: Tue Feb 28, 2006 11:25 am 
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speedo gear goes into the speedo sender unit that sits in your gearbox. Not sure about falcons, but on commo's if you look under the car at the gearbox from the drivers side, there is a plug like thing hanging out with two wires running out of it. PRetty simple to unbolt, pull out the speedo gear, put in new one and then bolt up again.

I went from 3.08 to 3.7's in my ute and didnt notice F**k all difference in fuel economy either.

 

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Posted: Tue Feb 28, 2006 12:10 pm 
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Just remember, Ford only have 3.45 speedo gears...nothing higher...if you go 3.73 / 3.9 / 4.11 - you won't be able to get anything from Ford...the only option is a police spec cluster that has the speedo calibration feature.

 

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Posted: Tue Feb 28, 2006 1:11 pm 
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Or the Jaycar Speedo Corrector, which i am still playing with to get the thing working with a ford speedo
Brett

 

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Posted: Tue Feb 28, 2006 6:45 pm 
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so is it as easy as just getting the gears and pulling the 3.45 out and putting the 3.7 in?
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Posted: Tue Feb 28, 2006 8:12 pm 
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assuming so, and from 3.08 to 3.7 my speedo is out as follows:

SPEEDO READING / ACTUAL ROAD SPEED

60km/h / 44km/h
80km/h / 57km/h
100km/h / 80km/h
130km/h / 100km/h
180km/h / 145ish

so as u can see its a real prick tryin to work it all out, so just get a new speedo gear, as u can also see its not really consistant

 

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Posted: Tue Feb 28, 2006 8:26 pm 
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Mal wood will have the speedo cog for higher than 3.45 gears. Thats where I got mine when everyone told me I couldnt get one.

 

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Posted: Tue Feb 28, 2006 8:29 pm 
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danbode wrote:
so is it as easy as just getting the gears and pulling the 3.45 out and putting the 3.7 in?


it's not something you could do at home.

 

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Posted: Tue Feb 28, 2006 8:48 pm 
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Has anyone got any time slips with their 3.08's etc etc, then again with their 3.45's / 3.7's???

It would be very interesting to see the difference...
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