Different Gear ratios

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Jan 29, 2010 | 10:56 PM

Egg1456

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From: Jefferson City MO

Different Gear ratios

I am wanting to get my t56 rebuilt by tick shift but i want to drop the 6th gear ratio down to .62 or near and i was wondering where i would be able to get a different 6th gear with the lower ratio.

Jan 30, 2010 | 01:57 AM

the_merv

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You wont be able to do just 6th..if you can find a Cluster and the Gears you can do both 5th and 6th to a lower Gear. Why not just change out the Gears in the Diff..that would be cheaper.

Jan 30, 2010 | 07:20 AM

85MikeTPI

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From: Newark, DE

This thread has some of the relevant info for you on changing ratios:

https://ls1tech.com/forums/manual-tr...gear-swap.html

Jan 30, 2010 | 02:56 PM

Egg1456

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From: Jefferson City MO

I know you can just do 6th. Because i like my 4.10s for drag, not soo much for gas mileage, soo if u change 6th u get the best of both worlds

Jan 30, 2010 | 03:26 PM

the_merv

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^^Have you torn a T56 down?

Trust me you can't do just 6th..it's both 5&6, or none.

Jan 30, 2010 | 03:33 PM

Egg1456

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From: Jefferson City MO

i forgot to put 5th and

Jan 30, 2010 | 03:44 PM

hivoltagedriver

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From: Owasso, OK

The M12 version of the T56 (Z06, CTS-V, GTO) had the gear ratios that you are looking for. We also got a steeper 2.97 1st gear. Maybe just as cheap to find a M12, and drop to a 3.73 or 3.90 rear gear.

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Jan 31, 2010 | 08:23 AM

85MikeTPI

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From: Newark, DE

How is taking 6th gear from 0.50:1 to 0.62:1 going to increase your millage from 25 to 30mpg ?

Jan 31, 2010 | 08:36 AM

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eseibel67

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Quote:

Originally Posted by 85MikeTPI

How is taking 6th gear from 0.50:1 to 0.62:1 going to increase your millage from 25 to 30mpg ?

Yes, you are going the wrong way. Stock 5th gear is 0.74:1.

Jan 31, 2010 | 08:54 AM

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spaz1

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^^ what he said?????
From What i've read the 5 and 6 gear tooth count is the same on mm6 and the mn12 transmissions, it's the input shaft that has a differnt tooth count and changes the ratios.

Last edited by spaz1; Jan 31, 2010 at 11:46 AM.