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2wd cosworth diff ratio's talk to me!!

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Old 08-03-2015, 08:44 PM
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doga-ot
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Default 2wd cosworth diff ratio's talk to me!!

Right we all know 2wd cossie diffs are 7.5" but how many ratio variants are there and how do you tell the ratio of diff you own?

Cheers Wes
Old 09-03-2015, 07:50 AM
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Marc sierra
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There are lots of different ratios for the 7.5" diff, but the cossie only had 3.64:1. The ratio is normally written on the tag on the diff casing. If that has been removed you can always open the casing and it should be written on the crown wheel in white.
Old 09-03-2015, 09:09 AM
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Originally Posted by Marc sierra
There are lots of different ratios for the 7.5" diff, but the cossie only had 3.64:1. The ratio is normally written on the tag on the diff casing. If that has been removed you can always open the casing and it should be written on the crown wheel in white.
Cheers Marc, im running a boa with bob cams and subaru injectors so what is best ratio for me to use my gear bix is mt75 hybrid rwd

Last edited by doga-ot; 10-03-2015 at 09:53 PM.
Old 10-03-2015, 09:51 PM
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Marc sierra
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Depends on what's the ratio of your 5th gear. Mine is 0.83 and I'm using a 3.36 diff. But if you're using a diesel box 5th gear can be 0.76 and in that case I'd use the 3.64 diff.
Old 10-03-2015, 09:54 PM
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Originally Posted by Marc sierra
Depends on what's the ratio of your 5th gear. Mine is 0.83 and I'm using a 3.36 diff. But if you're using a diesel box 5th gear can be 0.76 and in that case I'd use the 3.64 diff.
Not sure if its an ordinary 5th gear or the scorpio 2.3d 5th gear will find out when I drive it if revs are high in 5th
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