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Changing diff gears from 3.08 to 3.45/3.7 


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 Post subject: Re: Changing diff gears from 3.08 to 3.45/3.7
Posted: Mon Aug 09, 2010 8:39 pm 
Getting Side Ways
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Age: 29

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Joined: 24th Nov 2005

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Location: Dunedin
New Zealand

Sorry to bump in on your thread, saves me opening a new one. I'm contemplating going to 3:45's as i have fitted the AU T5Z which has the 2.95 etc gear sets as opposed to the E series 3.3?, it doesn't quite feel right with the 3:23 diff, especially at 100k, it won't sit at 100k, it will cruise fine at 90, or at 120, but i have to keep my foot on the pedal more than i should to have it sitting at 100k, and it's doing about 1900-2000rpm at 100k.

Should i be sticking in the 3:45's to match the gearbox? Will fuel economy improve?

She has really long legs! Even the WOF guy who tested the car, took it out, came back and the first thing he said was "it's got bloody long legs".



1993 LTD V8 Oregon 5 speed "click me"

Trick Flow Heads/Cam/Intake, Crane Ignition, T5Z Trans.

 Post subject: Re: Changing diff gears from 3.08 to 3.45/3.7
Posted: Tue Aug 10, 2010 12:14 am 
Stock as a Rock

Age: 33

Posts: 116

Joined: 22nd Oct 2009

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Ride: 1977 Ford Escort/ 1994 Ford EF

Location: Traralgon
VIC, Australia

WindeX wrote:
Anyone have any real data for how much they jumped in consumption when changing ratios. I have a Fairlane with 3.89s in it and while the gears are great the car is my cruiser as I have another car thats my speedster. What kind of economy benifit would I get from going back to 3.45s?

FYI When cruising at 100km/h I am on about 2250 RPM.

with an Auto,
3.45s sit at about 2000rpm.
and 3.23s about 1750rpm.
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