I was looking at Tremec's web site and came across this version of the T-56.
PN: AA08-000-013
Center Distance: 85mm
Weight: 139/63 lbs/kg
Torque Capacity: 650/881 lbs.ft./Nm
GVW/GCW 4,000/1,814 lbs./kg.
Gear Ratios
1st 2.29
2nd 1.61
3rd 1.22
4th 1.00
5th 0.85
6th 0.75
Rev 3.15

Notice the torque capacity! The gear ratios are different, but other than that does anyone know what the other differences are compared to our tranny? Any way this (or the parts) could be adapted? I emailed Tremec, but the chance of getting a coherent answer from a big corporation seem slim.

Rich Krause

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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

Keep this one up...I think you might be on to something, Rich! I would be interested!


Ryan

 

Ryan: I am gonna make a good effort to find this out. If it can be adapted this would be a really good thing!

Rich Krause

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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

Hmm...

we are setting out on a simular project here. The new cobra has more desirable OD ratios then our trans. Seeing how the OD section in pretty much seperate We are going to try and purchase all the OD parts from Ford and see if we can slip then into a 01 Bird for Silver State Challenge racing

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Ellis
Team Captain
Team North West F-Body
www.teamnwfbody.org

 

OneFlyn95z28, if you're looking for a 0.80:1 5th gear set and 0.62:1 6th, (same as the '03 Cobra) you have no farther to look than the "G92" 1993 T56, which has the following ratios...

1st - 2.97
2nd - 2.02
3rd - 1.43
4th - 1.00
5th - 0.80
6th - 0.62

I too am interested in "swapping gears" in a T56, since my application is somewhat special and with the lack of aftermarket gear sets for my differential, I'm limited to the 4.10 I already have or the 3.90:1 which came in the automatic cars, unless I want to spend a bundle having one made. With a 556 lb-ft. 396 and a 2.97:1 first gear, that's a little much for a P285 street tire.

Advice so far has been to start in second gear, which would drop final drive to 8.07:1 instead of the 11.58:1 (G92 T56, 3.90 diff) of first gear, but being able to take the 2.29 1st gear from the Tremec Rich listed would give me a more ideal 8.93:1 (3.90 diff) first gear and save me from losing a gear.

If I could have a T56 case assembled with the following gear ratios, I'd be happy.

1st - 2.29
2nd - 1.61
3rd - 1.22
4th - 1.00
5th - 0.80 or 0.74
6th - 0.62 or 0.56

I assume that the improved torque rating of the 2.29 Tremec is directly related to the first gear ratio, since the 3.36:1 '93 transmission was only rated at 350 lb-ft., the 2.97:1 G92 '93 was rated at 400, and the now standard 2.66:1 is rated at 450. It would be nice to be able to mix and match gear sets, assuming the case dimensions aren't altered, and wind up with a more ideal set of gear ratios.

D&D Performance might be the first place to start, since they can build T56s to order, I believe.

 

Jim: do you have contact info. for D+D?

Rich Krause

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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

D&D Performance
(248) 926-6220
http://ddperformance.com/index2.htm

Mark Montalvo recommended them to me.

 

Well, here's the word on the 650ft-lb Tremec T-56.

"This particular model was developed and assembled (per order) in very low volumes for the Viper racing program. It has a considerable number of non-production components that will require a considerable lead time (and expense) for the order. The input configuration (clutch housing, input shaft, bearing cap, clutch release) are different and would have to be modified to work in the Camaro application. With further interest and review it may be possible to swap these components to make the job easier. I’ve been told these units will sell for approximately $25,000 due to their limited nature and special components. If you are still interested in this model rather than one of the standard production models, let me know and I will put you in contact with our aftermarket sales manager."

I guess if I really have to "upgrade" it will be to a TH400.

Rich Krause

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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

$25k eh? That seems mighty ridiculous.... I'd think they could Custom machine each peice out of Titanium and come in under that budget.....

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Kurtis Tamez
LT4-396.com
97 Z28 LT4-396
94 Firehawk LT1-396
Team NW F-Body

 

Rich,

Is you main concern the T56 output shaft problem or are you having other failures in your T56 as well? I still have my broken output shaft sitting on the bench and I threatened to do a shaft design to beef up the output splines. The design is no problem. Finding a machine shop to grind all of the bearing surfaces and broach all of the splines is the deal. Also Material selection and the heat treat process is critical. Maybe Tremec would be kind enough to E-mail a DXF file of the stock output shaft. HAAAAA! I haven't totaly given up on this up yet, probably because I haven't broken my second output shaft yet. I'm kinda in the same boat as you. I really don't want to do the TH400 thing.

Regards,
Steve

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94 Formula M6 4.10 Strange 12 bolt Spohn Subs,LCA,LCA Brackets, & PHR,Moroso Cold Air, B&M Ripper w/ T handle/w switch , Hurst Line Loc,ET Streets, FLP's with B&B Triflow's, Taylor Wires
Street Twin, Spool
CC306, R lifters, Pro Mag 1.6's
Cloyes Double
Protune by me (Protune?)

3710# Pig Fat Race Weight
335 RWHP best 60' - 1.76
Best 1/8 - 8.05 @ 86.5
No 1/4 times yet

 

Steve: mine is good, so far. But a friend (with less weight and less power) also broke his and I am thinking of ways to avoid the problem. I am personally not very familair with transmission internals. You obviously are. Are you conversant enough with this stuff to be able to talk to Tremec and see if just the output shaft in the PN: AA08-000-013 would fit our transmission? The person at Tremec who answered my question was Steve Cochran at scochran@ttcautomotive.com.

I really don't want an automatic or to give up my 0.50 sixth gear.

Rich Krause

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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

Rich, call up D&D. We just had them rebuild a customers tranny here with some upgraded parts. D&D also offers cryo treatment for the gears. Before I gave up on T56s I would contact them and try one of their upgraded rebuilds.

Jason

 

Jason: thanks for the tip

Rich Krause


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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"

 

Why limit yourself to just a tremec.... I would think that liberty, g force or the likes could help you out.. Maybe even take a richmond 6 speed and beef the pee out of it. Then you could even have a scatter shield under the car. You would have to make up some hydraulics but wouldnt think that would be a major cost at all.

Steven

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383 Inches of stroked turbocharged fun.
If one is good shouldnt 2 be great?????
TURBO=TORQUE
TORQUE=FUN
Ask me about Burhead Headers If you are gonna use them
My Car

 

I'm thinking because he wants to keep the nice .5 6th gear overdrive of the T56. The OD on the Richmond is only like a .75 and I doubt its much stronger anyways (based on its rated TQ numbers).



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Jason
93 TA, M6