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      04-18-2017, 01:45 PM   #1
Harrison256
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What final drive gear do I have?

Trying to figure out how to tell which final drive gears I have. I've searched the forums but found conflicting information from different people. Some say I have x others say I have y. I have a 2006 3.0Si Manual transmission (last 7 vin: lw91373).


And depending on the answer would it be worth it for me to upgrade?
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      04-18-2017, 02:05 PM   #2
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3.0 SI manual uses the 3.46 the automatic uses the 3.64 diff ration IIRC.

Not sure what the actual 1-6 ratios are.

As for whether it would pay to upgrade, that depends on your goals.

Pretty good discussion here although it's a bit FI (turbo, S/C) focused.
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      04-18-2017, 02:29 PM   #3
Harrison256
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See thats where I get conflicting information. I have heard that the Manual has the 3.64 ratio not the automatic?

Either way would going from a 3.46 to a 3.64 be a significant difference? Most of the FD swaps I see are from lower like 3.3 to 3.64
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      04-18-2017, 03:04 PM   #4
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Check this site for ratios

http://www.bokchoys.com/differential/GearRatios_E46.htm
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      04-18-2017, 03:23 PM   #5
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      04-18-2017, 05:05 PM   #6
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Quote:
Originally Posted by dbarton62 View Post
Hmmmm....it looks like the FD in 3.0si roadster is a little taller (3.23) than in the coupe (3.46).
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      04-18-2017, 07:03 PM   #7
Harrison256
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Quote:
Originally Posted by Roadroach View Post
Hmmmm....it looks like the FD in 3.0si roadster is a little taller (3.23) than in the coupe (3.46).
Not doubting you but where did you see the differentiation between coupe and roadster?



Has anyone here done a FD swap themselves?
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      04-18-2017, 07:54 PM   #8
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Quote:
Originally Posted by Roadroach View Post
Hmmmm....it looks like the FD in 3.0si roadster is a little taller (3.23) than in the coupe (3.46).
You are correct
Quote:
Originally Posted by Harrison256 View Post
Not doubting you but where did you see the differentiation between coupe and roadster?




Has anyone here done a FD swap themselves?
E85 roadster E86 Coupe

I have R&R'd 4 different diffs in my roadster
Not an overall difficult job.
You will need the necessary safety equipment to work under the car, a torx socket set and a torque wrench besides normal hand tools.
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      04-18-2017, 08:05 PM   #9
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Quote:
Originally Posted by Harrison256 View Post
Not doubting you but where did you see the differentiation between coupe and roadster?



Has anyone here done a FD swap themselves?
Just dropped mine out yesterday, wasn't so bad just a lot of interference. Not sure how different it is Si compared to M

E46 non-M - http://www.bokchoys.com/differential/diy_diff.htm

M - http://adrianteo.com/files/replacing...ntial%20M3.pdf
http://adrianteo.com/files/RA%20%20R...er%20shaft.pdf

I have a feeling putting it back in is going to be a pain in the ass
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      04-19-2017, 08:46 PM   #10
Harrison256
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Let me know how the reinstall goes for you
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