Finster07

I have been wanting a Z06 for a very long time now. As I run the numbers, I have to decide on an 07 vs an 08. That said, I just read that in 08, they have a different transmission, the TR6060. What is the difference on this one from the 07 T56?

Also, I very briefly drove my friends 07 Z06, and my impression was that 1st gear was very tall and went on a long time before I went into 2nd. All I have to compare it to in my 07 base model 6 speed with 3.90's.

camirocz

there is hardly a difference none as far as driving experience goes.

Hurley1

The T56 has more of a "notchy" feel, and the shifter sits a tiny bit higher than the TR6060, I have owned 2 with the TR6060 and 3 with the T56, I like them both......

C5 Frank

The gear ratios are exactly the same... the main difference is the TR6060 has a higher torque capacity. Also the throws are ever so slightly shorter in the TR6060. There have been some early '08 that have had some issues with this trans however. They can be very clunky when cold.... cold meaning until fully warmed. Some owners have Lemon lawed their cars due to this issue as it can be bothersome in cold climates.

With that said I have driven several '08 and up Z and have never felt this issue. The TR 6060 felt solid and is an upgrade in my book! Whatever car you decide on, drive it thoroughly and be sure it meets your standards!

redZ06bri

The TR6060 has a history of having a "clunky" shift pattern when cold, particularly going from 1st to 2nd gear. After it warms up, no problem. If you check, there is a TSB about this recommending "no fix, tell customer it is normal". I don't find it to be a big problem, but I do notice it. This clunkiness may be why they changed to carbon fiber synchros in 2011.

tim414

I don't think (IMO) I would characterize this as "clunkiness", rather "notchiness" is word i would use to describe. It's especially noticeable in 1-2. And ONLY when cold. After a few minutes of driving and it warms up it's TOTALLY gone.

As someone mentioned, the synchros were supposedly changed in '11 to correct this. I personally don't have any issue with this. It does not affect the car moving....the only thing it would affect is maybe performance shifting.....but I don't think a driver would be driving the car real hard (when cold) until it's warmed up which then (notchiness feel) is a mute issue....

Personally, I own a 6060 but have also driven 'Z w/56....I did NOT notice any difference, either cold or warmed. The ratio's are same. I do NOT believe (IMO) that one is better over the other with only street driving. If your going to track, maybe one has advantage(s) over other....

redZ06bri

Agree with above. Let me add, performance shifting on a road course basically never involves 1 to 2 shifts in any case. Also let me add, it is my understanding that the 6060 is more robust in terms of how much power it can manage.. in fact, isn't that why they changed the tranny, because the T56 was only marginal for that power level ?

GMuffley

160KTS

TR6060 = new
T56 = old

They're both great transmissions (and thus they are found in many different vehicles from the 4th gen F bodies, to GTOs to SVT Cobras to GT500's and more) I have an 07 w/ the t56 and wouldn't consider the TR6060 an "upgrade" because the T56 has been around for much longer and has undergone many many years of hard driving in so many applications.

The notchyness is also present in the T56 if you think about it. Ever wonder why it's hard getting into 1st or 2nd sometimes when the trans is cold? Ever car I've owned/driving with a t56 is exactly the same.

MarkRx

owned both, both are notchy when outside temps are under 50 degrees until car is warmed up. i have an 07 but added a complete late model oem shift box, shift lever, closeout boot, outer cover, boot, and ****. shift height is 1/4 shorter on 08+ compared to 06-07 but the throw is the same. I haven't confirmed if the 2011's are the same or not.

http://en.wikipedia.org/wiki/Tremec_...0_transmission

both are fine, buy the car already

ranger talks about shift refusals (mentioned as shift block-outs on wiki) but dirty clutch fluid will more than likely be the culprit of that.

***I sold my 08 to a fellow forum member and got the chance to sit in it after about a year of woning my 07Z. felt like the 08 had ever so slightly throws but i can't be sure. either way you can't go wrong.

soroZ

Yea actually I'm having the same dilemma in regard to buying my z06, but I decided that the car is going to be all performance so I'm going for an 06 which is less quiet on the inside but also lighter weight which is what i really want, not to mention cheaper. I've already decided that i'll have to rebuild the t-56 pretty soon down the road.

Another question I'm planning on tuning my z06 for a 100 shot as soon as I get it, how far will it be before the tranny goes? cause I know nitrous gives the tranny a lot of torque to deal with.

Bill Dearborn

I wouldn't call the shifting notchy when the transmission is cold. It is more like a little sluggish. On the T56s in my 97 and 03 it felt like rowing through heavy mush until the tranny warmed up a little. With the 08 I can feel the gears nibbling a little as I move the shifter slowly between 1st and 2nd. On any of them the sluggishness disappears within a mile of starting out. Just think how hard the shifting would be if they still used gear oil instead of ATF in the transmissions.

Both transmissions are easy to shift when warm with the TR6060 being a lot easier than the T56. I can shift my Z fast and easy using two fingers and the heel of my hand with just a bit of arm movement. On the earlier cars I had to use 3 fingers, the heel of my hand and a fair amount of arm movement.

Bill

rattt g

also cars with the t56 trans the rear ends have clutch packs
and the cars with the 6060 the rear ends have spider gears

160KTS

You have to realize that the t56 is not the weak spot of the drivetrain. You will be able to spray a 100 shot on it without any issue from the transmission. The clutch might be another story though. Just because the TR6060 is newer than the T56 does not make the t56 a sub-par transmission. The t56 is the last thing you need to worry about breaking with 100 more horsepower. Just think, you don't see people saying "oh no, my trans bit the dust!" nearly as often as "oh no! I have 250 additional horsepower and my clutch can't handle it!" or some other part.

Bottom line, the TR6060 and the T56 ARE BOTH GOOD TRANSMISSIONS AND THE T56 HAS A HISTORY WITH HIGH HORSEPOWER CARS.

soroZ

Yea I understand my c5 held 650whp pretty steady with the t56 and a twin plated clutch.
My main problem is that it bothers me that my z06 will share the same tranny as a 98 f-body just bothers me a tiny bit, although i'm aware of how good the tranny is overall. If there is any difference between the older t56 and the ones in the 06z06 besides the clutch i would be delighted to know.

OldDominion

Now that is an interesting bit of information. Would there be any difference in strength or longevity differences between the two? Or did they do that just for reduce NVH?

Well the Corvette model doesnt have a bellhousing or tailshaft housing

But in all seriousness, unless they went with triple cone syncros like they did with the MN12 variant of the t-56 like with the c5 Z06 and the GTO, then ratio wise it may be the same.

Rock36

I don't think the differences between the T56 and T6060 are enough to really warrant a change if you already ran the numbers and decided an 07 was for you.

1st gear in either car will be tall, that is just the way it is in the Z06. It is pretty cool getting to 60mph in first gear.

golfinz

6060 > t56. Holds gobs more power and is like butter to shift. Im a high hp c5z guy (800rwhp) and the 6060 is what we go to when making tons of hp because it holds everything that's thrown at it and is super easy to drive/shift

JJC5

That's the first time I've heard that. The clutch packs in a limited slip differential are there to make it a "limited slip."

OldDominion

Well maybe they used a different type of limited slip. In the 98-02 F-bodies the 98-00's used an auburn type limited slip which used clutch packs where as the 01-02's used a torsion type which didn't use clutch packs. Not sure what it did use but i know that you didn't have to add the extra additive to the gear oil to make it quiet like you did with the other limited slip unit, although it was still recommended.