M12 or new rear end ???

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Jul 17, 2008 | 08:10 AM

LDB C5

Thread Starter

Drifting

Joined: Sep 2006

Posts: 1,757

Likes: 13

From: Stillman Valley Illinois

M12 or new rear end ???

I am replacing my clutch in the very near future, and I am considering changing the gearing at the same time. I also looked at the gear ratios in the M12 transmission.

I can get nearly the same effect with the M12 as I can get from 3.90:1 gears, but the ratios are further apart.

So the $64.00 questions is am I better off going with a M12 and staying with the stock gearing (3.42:1) OR keeping the M6 and going with either 3.73:1 / 3.90:1 rear end gears?

TIA

Jul 17, 2008 | 08:15 AM

vettenuts

Team Owner

Joined: Mar 1999

Posts: 22,025

Likes: 192

From: At the beach in little Rhody

I found the car much better on the highway in 6th with the 3.90's, an effect you won't see with the MN12. I went through the same process.

Jul 17, 2008 | 08:37 AM

LDB C5

Thread Starter

Drifting

Joined: Sep 2006

Posts: 1,757

Likes: 13

From: Stillman Valley Illinois

What rpm are you running on the highway at speed?

Jul 17, 2008 | 08:37 AM

Bull_in_a_china_shop

Racer

Joined: Aug 2003

Posts: 327

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From: Metamora IL

I did the m12. I got a nused one for $1000, to replace my 100k+ T56. Good cheap way to upgrade the low gears. O basically the whole deal cost me $500 by the time I sold my old trans

Jul 17, 2008 | 03:56 PM

HP_Addict

Melting Slicks

Joined: Apr 2003

Posts: 2,285

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From: Nashville TN

I would say go with 3.90 gears. You will see more benefit from this. I was running 3.90s with my MN12 and just recently swapped my MN12 for a MN6. The MN6 and 3.90s are a sweet combination, IMO.

Jul 17, 2008 | 04:16 PM

99C5JA1

Pro

Joined: Feb 2003

Posts: 623

Likes: 11

From: Ankeny IA

With the amount of power you're making the ultra low 1st gear in the M12 will make traction problematic. If your car doesn't see a lot of track time with slicks the 3.73 may be the best choice.

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