# Help identify this diff

**URL:** <https://forums.speedlife.net/t/help-identify-this-diff/110910>\
**Category:** SON240sx Automotive\
**Created:** [November 9, 2007, 5:48am UTC](https://forums.speedlife.net/t/help-identify-this-diff/110910 "2007-11-09T05:48:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![CA18S13](https://avatars.discourse-cdn.com/v4/letter/c/f0a364/32.png) [@CA18S13](https://forums.speedlife.net/u/CA18S13)\
**Post date:** [November 9, 2007, 5:48am UTC](https://forums.speedlife.net/t/help-identify-this-diff/110910/1 "2007-11-09T05:48:52Z")

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Hi,

I picked up this diff from Matty… It seems to be a Q45 casing, but the ratio on the rear diff is 48:11 (4.36:1), rather than 3.54:1 like the standard Q45.

Also, this looks to be a 2-way mechanical LSD as the cam seems to have the same profile in both directions (circular cam) so it has the same locking for bot acceleration and deceleration.

![http://i5.photobucket.com/albums/y159/JDM_S202_STI/LSD001.jpg](http://i5.photobucket.com/albums/y159/JDM_S202_STI/LSD001.jpg)

I dont see any stampings on the LSD untit itself except for a “C5 D5” stamped on the ring gear side.

Thanks in advance.

Ian

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**Author:** ![RED\_LINE](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/red_line/32/5656_2.png) [@RED\_LINE](https://forums.speedlife.net/u/RED_LINE)\
**Post date:** [November 9, 2007, 8:01pm UTC](https://forums.speedlife.net/t/help-identify-this-diff/110910/2 "2007-11-09T20:01:23Z")

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dam, can this be another treasure? 😃

I swear this Matty dude sure gets lucky with his  
parts 😉

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**Author:** ![matty](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/matty/32/5043_2.png) [@matty](https://forums.speedlife.net/u/matty)\
**Post date:** [November 10, 2007, 6:15am UTC](https://forums.speedlife.net/t/help-identify-this-diff/110910/3 "2007-11-10T06:15:50Z")

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sorry to thread jack ian

but yeah, i went through three weeks of hell where i swear i was thee most unlucky person ever, its like my patience was being tested by god

then it did s complete 180, and the past 3 weeks have been the luckiest ever

ian, since i thread jacked, im going to tey to do some research to help you find out what it is

ttyl