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diif ratio 


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Posted: Tue Aug 14, 2007 5:31 pm 
Getting Side Ways
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how about this would it be any good value for money??? and would it be easy to fit??? ... dZViewItem
Posted: Tue Aug 14, 2007 5:37 pm 
Fordmods Junkie
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moody wrote:
i sit on 2100 with 3.45 gears in a 4speed.
100 in second, with 4.11's Thats nuts :o

your tacho must be out mate my cous has 3.45's and sits on 2100 at 110 and an auto.

Second at 100 in mine and the tacho jumps to 5000 :D



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Posted: Tue Aug 14, 2007 6:40 pm 
Getting Side Ways
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FordFairmont wrote:
More Grunt wrote:
can anyone who knows how work out what the 100kmh rpm speeds would be in a 4 spd auto for ......

Just take note of what revs your doing with your current diff ratio and...

(current rpm @100) divided by (current diff ratio) multiplied by (new diff ratio)

eg. It does 1850rpm @100km/h with 3.08 diff and you wanna upgrade to 3.7 so...

(1850 / 3.08) = 600.6 x 3.7 = 2222 rpm @100km/h

Thanks digger, I was always a flop at maths :)

2200 at highway cruise sounds acceptable. unless I drove or drove in someones car who had 4.11's Id be reluctanct to use them myself purely because Id hate to put em in on mine then hate the highway rpm.

Plus also- If I went 3.7's I can still change to t5 later IF i ever chose to, without having to change diff. it keeps my options open. I guess Id have to see 4.11's in a btr before I make a 100% descision though.



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