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6-Speed transmissions

5183 Views 11 Replies 8 Participants Last post by  MattD, 
OctaneZ28
For comparison sake, I put together a little spreadsheet of some 6-speed transmissions.

Included are manuals and automatics from CTS, CTS-V, Corvette, and G8.

Interesting comparison, the Z51 T-56 and the new TR-6060 are quite similar.

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A
Which manual tranny do you think we'll see?
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Jinx
I hope the T-6060 is rated as good as the T56 or better. I like to see a rating at 600ftlbs. I cant see the chart, but I betting after first gear the two trannys compare identical except for 6th gear, no?
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brandonppr
2
Here is some more info if you want to add it:

AY6

Engine range: 2.8L - 3.6L
Maximum engine torque: 345 Nm (255 lb-ft)
Reverse: 3.67
Case material: aluminum
Center distance: 85mm
Fluid type: 75W90
Transmission weight: wet: 57.2 kg (126 lb)
Fluid capacity (approximate): 1.8L (1.9 qt)
Applications: Cadillac CTS

T56

Type: rear wheel drive, six-speed manual
overdrive transmission
Engine range: 6.0L gas
Maximum engine torque: 400 lb-ft ( 542 Nm )
Reverse: 2.9
Maximum validated gross vehicle weight: 4000 lb ( 1680 kg )
Case material: aluminum
Center distance: 85mm
Fluid type: DEXRON® III
Transmission weight: wet: 54.9 kg (121 lb ) 61.5kg (CTSV)
Fluid capacity (approximate): dry: 3.8L (4.0 qt) 117 oz.
Applications: Chevrolet Corvette
Chevrolet Corvette Z06

Z51 T56
Type: rear wheel drive, six-speed manual
overdrive transmission
Engine range: 6.0L
Maximum engine torque: 400 lb-ft ( 542 Nm )
Reverse: 2.9
Maximum validated gross vehicle weight: 4000 lb ( 1680 kg )
Case material: aluminum
Center distance: 85mm
Fluid type: Texaco ATF Type III 1863
Transmission weight: wet: 54.9 kg (121 lb )
Fluid capacity (approximate): dry: 3.8L (4.0 qt) 117 oz.
Applications: Corvette Z51

CTS V T56
Type: rear wheel drive, six-speed manual
overdrive transmission
Engine range: 6.0L gas
Maximum engine torque: 400 lb-ft ( 542 Nm )
Reverse: 2.9
Maximum validated gross vehicle weight: 4000 lb ( 1680 kg ) 4605lb (CTSV )
Case material: aluminum
Center distance: 85mm
Fluid type: DEXRON® III
Transmission weight: wet: 54.9 kg (121 lb ) 61.5kg (CTSV)
Fluid capacity (approximate): dry: 3.8L (4.0 qt) 117 oz.
Applications: Pontiac GTO ( M12 )
Cadillac CTS-V ( M12 )
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OctaneZ28
Yeah the TR6060 is rated for more torque, but I haven't yet found the exact specification on that.

Here's a comparison in build material between the T56 and the TR6060:

In short, it's better in just about every way. It can handle more torque thanks to a move from a 10-spline input shaft to a 26-spline unit. Moreover, the new case is stronger, the countershafts are one-piece units, and the gear faces are wider. All these changes add up to much greater strength, which we'll all appreciate after we start modding these cars. What we noticed while driving the car, however, was its easy, precise shifting despite the factory shifter.

The prime movers in the better shifting are increased synchronizers on all the gears. Where the Terminator T56 had only two synchros on the 1-2 and 3-4 shifts and single synchros on the remaining gears, the TR-6060 offers triple synchros on the 1-2 and 3-4, and dual synchros on all remaining gears, including Reverse. Plus, the synchronizers have been upgraded from a carbon-particle paper to a sintered-bronze material.

A larger input shaft, beefier gears, more synchronizers, closer gear ratios, and more make this six-speed one that should become a popular aftermarket upgrade.
So this transmission shifts easier, but it also offers a shorter shift throw. "The synchronizer hubs are much narrower, reducing fore and aft shift travel," Tremec's Jim Averill explained. "Additionally, the hub system uses three encapsulated ball-and-coil-spring struts that are much more precise than the old-style hoop-and-stamped strut. This also adds to a smoother fore, aft shift."
Click to expand...
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Jinx
looks very promising. With those upgrades I can see at least 550ftlbs.
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Luwinkle
So, which one do you think the Camaro will get? A common guess would be the same one the G8 has..but considering it isn't out yet..they might put in a different trans. Or if the LS3 is in, a different trans for that(and the current one for the L76..if they have it in the camaro).



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USA1Camaro
I'd guess we'll see the TR-6060 or a close variant. They could still make some improvements within the next year or so.
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OctaneZ28
The V6 G8, that gets the 5L40E 5-speed automatic.
The V8 G8 GT gets the 6L80E 6-speed automatic or the TR6060 6-speed manual.

Would make sense if Camaro got those same transmissions.
Though I would like to see a 6-speed in all applications.
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Luwinkle
Good, it gets the better of the 6spd manuals.



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PUREAUDIO
OctaneZ28 said:
Yeah the TR6060 is rated for more torque, but I haven't yet found the exact specification on that.

Here's a comparison in build material between the T56 and the TR6060:
Click to expand...
id like to see the TR-6060
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M
The TR6060 replaces the T56.
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