Canonicity

Hi guys, first post. Looking into buying a Z06 corvette, and researching difference between the model years.

Found out that the 2008's have a T6060 transmission that replaced the 2006/2007's T56 transmission.

My question is, what's the difference between these two transmissions?

Thanks guys!

Mopar Jimmy

Don't know the mechanical differences but as I just bought an 06 Z last Saturday I have read that the 08 new tranny is 30 to 40 lbs heavier and some 08 Z owners notice some slight grinding noises when the tranny is not fully warmed up and they shift from first to second gear.

I am not sure why GM made the change but I am sure others will chime in here and know that answer to that!

Happy hunting!

tjwong

Aside from the few problems that cropped up in the earlier released units of the 6060, as told to me by RPM Transmissons, the 6060 is the desired peice for high powered cars. I was advised to replace my T56 when I get my final forced induction build done as my T56 won't be able to handle the power.

C5 Hardtop

With the updated trans, the shifting effort is better. There isn't so much knotchyness. From the page linked below: "The manual transmission shifting improvements include a more positive and direct feel during gear changes, with better gate-to-gate location. "
source:
http://www.corvettemuseum.com/specs/2008/index.shtml

Lots of details on this page here.


I do like the new trans shifting. However, both my '08's have/had shifting when cold problems. It will grind if I don't double clutch. Once warm, no problems.
The 2-3 shift at high RPM requires different finess(sp) than with the T56. So if your brain is programmed for the T56, you'll need a slight adjustment.

JoesC5

http://corvetteactioncenter.com/spec...008tr6060.html

GMuffley

Minor differences at best. Don't let that factor control your buying decision.

Vito.A

I disagree. The TR6060 is a major revision. There were some problems with some of the early versions, but most were fixed with a fluid change.

LowFlight

Had an 07.....now have an 08. Not too impressed to be honest

Mr. Gizmo

Despite the gear ratio differences in the Zr1 , I also read that the 6060 evolved into the Z06 in 08 in anticipation of the 09 Zr1 to handle the greater torque and HP.

Jorday

ALL T56 and TR6060 transmissions can experience the 2nd gear cold grind thing. That behavior is not a new thing with the TR6060. I've seen a bunch of older T56 cars that did it and personally owned a couple.

I agree. It is a heavier duty unit in most aspects. It shifts more smoothly into all gears particularly reverse. The TR6060 will not fight you a little bit going into reverse like the T56. The throw of the shifter is also shorter on the 08+ models.

JoesC5

I think the TR6060 is rated at 500 lb/ft(at least in the Z06 and Zr1) where the T56 is rated at 428lb/ft capacity.

1stZ

Ive had my '06Z since Aug. '06. I have well over 428 tq. My car is primarily a track car. although, it has now 34k miles combine with the old & new motor & also both track & street miles. Having been in the track a total of 42x (Ave. A total of4 hrs. Sesseions/day) on '06, & '07 combine. Slowed down a bit in '08 & '09 & track the car only 18x but that cuz I lost my motor & funds. Now '10, I've run 6x already. I hope I don't jinx myself but t56 continues to run strong. The only maintenance I do is replaced both tranny & rear end fluid once a year. I'll assume that the T6060 is a better tranny. But so has been the t56 for me & then some. BTW, my tranny is "TOTALLY STOCK"!

Vette5.5

Main reason GM changed out transmission's is, the T-56 was fazed out when the 6060 came in. The 6060 may have improvements in some way's, but doubt you'll notice much of anything. Don't care much for the extra 40 lbs, though

JT Metal

JMHO- I don't think the TR6060 is as durable as the T56. I have a T56 that has been driven for the last 5yrs with 525+RWTQ being applied. No problems. From being on the forum there seemed to be alot of problems with TR6060. Maybe it got better, Who knows..........

I'm sure Borg-Warner changed hands........So not an option for Z06!!!

EX1

The T6060 was in my GT500 and i was very happy to know that it was in my 09 Z. The 6060s are more durable and can take more punishment. I was making over 800rwtq and pushing a 4000lb car with the Shelby. That much torque and weight is a huge strain on the drivetrain. The tranny never gave me a single problem for over 2 years. They are amazing pieces.

JT Metal

When we talk about production line transmissions. Cost does factor in. Or they would/could all be bullet proof. When GM switched to Tremac in F-body from Borg-Warner. They (Tremac) were junk. Not that Tremac makes a crappy trans. I don't think GM wanted to afford a better trans..........If that makes any sense..............

blackvetterzo6

My buddy has thr tr6060 and has nothing but crap to say about it. Maybe he just got a ****ty one. Synchros gone bad twice in less then 15K. It happens.

JT Metal

Sounds like your buddy is a real GEAR JAMMER.........

Jorday

The TR6060 will put up with stuff that will crack the housing on a T56.

I wonder how many guys actually had a genuine "problem" with the TR6060. The 2nd gear grind is not a transmission problem but rather a variant of normal operation while the transmission is warming up. The heavy duty synchronizers used require normal running temperatures to deliver peak performance. Aggressive operation of the shifter before the transmission has a chance to warm up can chew them up, but guys get frustrated and just jam the shifter into 2nd which is the last thing that should be done.

Two failures with that low of a mileage is usually operator induced or there was actually a problem the first time and then the dealer did not repair/reassemble the transmission properly which leads to a second failure. I have seen the dealers not fix them right more times than I can even count.

If the car is doing the 2nd gear grind/clunk when it's cold you have to just shift gently and let it do its thing. It will stop after a mile or two if nothing else is wrong with it.

BADZ

I still have the STOCK t56 in my 850+ rwtq not a problem yet (knock on wood) and its been smooth all the way speed shifting..