TGiuliante

Hey Guys I have a MN12 tranney from a 2004 Z06. It is in my road race track car. I am going to rebuild it. I am located in Long Island NY any recomendations on a transmission specialist for this type of application in my area?

RichieRichZ06

There is no such thing as a MN12. They have a MM6 (standard C5) or the M12 (C5 Z06)

I am not familiar with any shops over there, but I figured you would want to know what the trans really is.

GOTHAM VETTE

http://www.rkt56.com/

SouthernSon

Just installed a Rockland (your neck of the woods) Tranzilla in my '03. Got through with a 3 day event. Shifted smooth as butter for the forward gears. However, let me get back to you in a couple of days while I see if it is the shifter that has me concerned about the reverse gear (have none).

http://www.rsgear.com/products/trans...tranzilla.aspx

Rick@RKT Performance

Give us a call, we keep all parts in stock and have a 2-3 day turn around.

MN6 = 6 speed manual vehicle/MM6 = 2.66 gear set/M12 = 2.97 (Z06) gear set.

Vettechris996

+1

Rick build my trans and I couldn't be happier!

redtopz

I'm a big fan of RPM transmissions. They can ship you a built tranny and you can use that box to return your core. Level 5 RPM trannys are excellent.

SouthernSon

Update on Tranzilla; bad reverse lock out solenoid. Tranny is just fine and buttery smooth.

Hi Volts Z06

I have to say that my RKT56 tranny is still going strong and Rick was a gentleman to deal with.

NemesisC5

Is this in a C5?

SouthernSon

Correct. I had installed an mn6 in the Z but found my camshaft too aggressive. I went back to the m12 and all is right with the world once more. I really like the latest 2 disc clutch pack from QM, also. It is much easier to modulate than the previous V 3 disc.

NemesisC5

Do you have the .86 5th and .73 6th gears? If so are they straight cut?

SouthernSon

same OEM gearing (03 Z06) but rebuilt to Race Ready Tranzilla specs. Works nicely with high RPM camshaft. Perfect shift points on the new NCM MSP with 420ish HP at the rear.

NemesisC5

I referred to Rockland's website and the .86 5th and .73 6th were posted for their Tranzilla 2.97 first gear tranny. I also called Rockland and was told the website numbers were slightly off but close. RPM told me to get those 5th and 6th gear ratios Rockland was using G-Force gears which are straight cut and are somewhat noisy with a noticeable whine to them. That's why I asked, wondering if you have the different 5th and 6th and did they whine. Rockland also said the T56 cases were fitted with 6060 internals and the Tranzilla was better than an equal to 6060 in shift smoothness and durability.

SouthernSon

I don't use fifth at the track unless I am at VIR. On the back straight there I short shift into 5th with top speed of 160 or so. Whether 5th and 6th are noisy doesn't bother me since it is relegated to track use only.

NemesisC5

I was curious, thanks for the answers.

argonaut

+1 for Rick Kim - he rebuilt my MN6 3 years ago, its been awesome ever since. He drilled a hole and tapped the tranny case for the oil cooler return line so that it blows cool oil right onto the gears. From what I understand - much better than using the fill hole for the return line. Whatever....all I know is the unit has performed flawlessly.

Rick@RKT Performance

FuriousDonuts

+1 for Level 5 RPM trans - has been rock solid for 2 years of hard racing; probably 30 events in total without a hiccup.

drivinhard

If you are running a stock 3.42 diff, it's a good time to switch over to a 2.66 1st gear box