Ford Cortina - In Rust We Trust

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October 17, 2026, 05:45:52 AM

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Author Topic: diff ratios  (Read 2512 times)

te_cortina_ghia

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diff ratios
« on: April 29, 2008, 07:40:54 PM »
hey im not sure if anybody else has this problem, i hava 4 speed 6 cyl 200ci te ghia.i think it revs far too high anything over 85 odd km's. i was thinking of getting a falcon diff centre.but am unsure as to which one to go for.im really just looking for some more top end speed without as many revs
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Tim9

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« Reply #1 on: April 29, 2008, 08:04:17 PM »
Sounds like you might have an auto that's been converted to a manual.

What RPM are you doing at 100 kms/h?


Tim
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te_cortina_ghia

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« Reply #2 on: April 29, 2008, 08:51:12 PM »
na its been in the family since brand new.hasnt been converted.it revs bout 2900 at 100km.does anybody know what diff centre i can put in?
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BigNorm

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diff ratios
« Reply #3 on: April 29, 2008, 11:34:39 PM »
if you have a 6 cylinder from new then it should have a 2.7* in it anyway. there isnt much you can do in the way of diff ratio as the falcons ran pretty much the same thing.

a couple of things u could do is run a larger diameter rim, or a gearbox/trans with overdrive.
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TE_351

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Re: diff ratios
« Reply #4 on: April 30, 2008, 12:36:48 AM »
Quote from: "te_cortina_ghia"
hey im not sure if anybody else has this problem, i hava 4 speed 6 cyl 200ci te ghia.i think it revs far too high anything over 85 odd km's. i was thinking of getting a falcon diff centre.but am unsure as to which one to go for.im really just looking for some more top end speed without as many revs


Hey man where abouts in Morphett Vale are you?? I live in christies.
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braddyxe51

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diff ratios
« Reply #5 on: April 30, 2008, 02:30:07 PM »
6s came with 2.77 and 2.92 and 4s came with 3.5. Not sure if any other ratio was an option. When I bought my te wagon it had a 3.23 in it but I think the previous owner put that in as well as the 5 speed. My 2.77 sit on around 2500 at 100kph in forth gear. I think I remember reading years ago that the 200ci came with 2.92 and 250ci was 2.77
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Tim9

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« Reply #6 on: May 02, 2008, 10:24:22 PM »
Well after a few more intelligence lubricating ales and finally finding the right  page (4-2-1) in my Factory Ford Corty TE/TF manual it says that the:

6 cylinders ran a 2.79:1 diff

4 cylinders ran a 3.42:1 diff

the final outputs of the auto and the manual were 1:1

2900 RPM does sound a little high for 100 KPH from what I can remember when I ran my 4.1.

I think I had it up to 200 KPH and was not quite at the redline of 4500 rpm.

I think 2400 might have been around the 100-110 koh.

Also maybe the engine might just a bit noisy from lifters or something.


Tim
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