LordMustangGT
Member
never ran the TKOs myself but I have a T-56 in one of my cars, never driven it myself yet, just awiating a tune.
TKO600 VS. T56 Viper Spec
- Thread starter Shaolin Crane
- Start date
Viper t56 good for lots of power shifts smooth as a t5 no weird vibartion problems just an all around great trans mission. I have an older vipert56 from d&d it has a final drive of .50. Really great when I was running a 4.10 gear. That being said I ran that trans on my NA set up and now I am turbocharged so now I run a 3.27 gear. Gives the turbos room to spool before you run out of rpms. Any way so now I could have run a tko and still been fine on the highway. Still like the viper even if my 6th gear is kind of a waste. By the way don't confuse the t56 for the viper t56 big difference, both strength and money wise.
Go and take a look at how many big turboed vettes, Vipers, Supras, and stangs are running 5-speed. In particular, look for the ones making around 1000 lbs-ft or more. I think you'll be surprised at what you find. It's the big displacemnt turbo/screw/roots cars you should be looking at. These are the cars that are going to overwhelm the tq ratings on TKO600s. There are a lot of T56s that are alive and well behind cars like these. I used to think the same thing of 5 speeds, but the evidence out there did not bear out this belief.
Chris
Cougar5.O
Founding Member
Mr. Rustypwnz
Advanced Member
all I will say is I LOVE MY TREMEC!!!!
I like the t56 as well, but I do all my driving in town, and at 70mph im at 1900rpm and it gets 25mpg so I really dont care for a t56 at the moment but a t56 would be nice if I wanted to roll like 4.30's..
Vipersix
Founding Member
The TKO600 is rated at 600 lb/ft tq. while the Viper spec T56 comes in at 650 lb/ft. So as has been said numerous times already, either tranny is fully sufficient for your numbers. Cost will be significantly higher for the T56 but you'll have the availability of the extra gear. How many people actually utilize that extra gear remains to be seen...
I hear many people complain about the shifting difficulty with the TKOs. This is true for the first 500 miles, at the most, until it is broken in. After such time, these transmissions shift like greased lightning. The reason is the rail system. The TKO is a triple-rail linkage system while the T56 is a single for smooth and quiet operation.
Much discussion is made about the internals of the respective models and I will consistently opine that the TKO models are more durable than the T56 variants. The T56 was designed for "luxury" sports cars with smoothness and noise reduction in mind. (Just look at the vehicles it comes in: Viper, Vette, Cobra, Aston Martin.) The TKO, on the other hand, was designed specifically for high-performance racing applications.
It all boils down to your pocket book and how you intend to use it.
Tremec makes both the TKO and T56.
I hear many people complain about the shifting difficulty with the TKOs. This is true for the first 500 miles, at the most, until it is broken in. After such time, these transmissions shift like greased lightning. The reason is the rail system. The TKO is a triple-rail linkage system while the T56 is a single for smooth and quiet operation.
Much discussion is made about the internals of the respective models and I will consistently opine that the TKO models are more durable than the T56 variants. The T56 was designed for "luxury" sports cars with smoothness and noise reduction in mind. (Just look at the vehicles it comes in: Viper, Vette, Cobra, Aston Martin.) The TKO, on the other hand, was designed specifically for high-performance racing applications.
It all boils down to your pocket book and how you intend to use it.
slow95gt said:
Tremec makes both the TKO and T56.
I can see that my opinion on the T56 is not the popular one. Here are a few posts on a different message forum from guys that run them:
danimal owns a 1000+ rwhp twin turbo mustang with a G-Force T56
This guy owns a 1000+rwhp mustang with a G-force T-56
Willie (Wolverine) has an SN95 that currently pushes almost 1200 rwhp through a G-Force T56. Here he actually says something negative about G-Force, but he never went into any actual detail:
More from WOLVERINE
Here's some info on various TKO catastrophies. Keep in mind that the X2C V1.0 is the same tranny as the MMR900:
Steed 93 has a fox with a TKO:
94scstang's sig reads:
I have a point of contention about those supra getrag 6-speeds, though. They may be found behind 1000+ rwhp supras, but keep in mind that those cars are making that power at upwards of 8-9000 rpm. That means that they're making a lot less torque than the mustangs making the same power at 6-7000 rpm. That makes things a lot easier on the tranny.
Anyway, I hope this helps someone out there. Just because TKOs will not break in 98% of street built cars doesn't mean that it is a stronger design than the T56s out there. The two companies that have a great reputation are Rockland Standard Gear, and G-force. Going with the TKO will give you all the strength you need for now, and it will be cheaper. I personally wouldn't even bother paying the extra dough for the MMR900. They don't even have to weld the keys anymore. From what I gather, pretty much all they do is cryogenically treat them. It will not be stronger than one of these top of the line T-56s. If you want the best, bring your wallet. You're looking at more than $5k for the G-force and around $8k for the RSG Tranzilla.
Chris
danimal owns a 1000+ rwhp twin turbo mustang with a G-Force T56
danimal95 said:
twinturboGT said:
ROGUEGTS said:
This guy owns a 1000+rwhp mustang with a G-force T-56
INTMD8 said:
Willie (Wolverine) has an SN95 that currently pushes almost 1200 rwhp through a G-Force T56. Here he actually says something negative about G-Force, but he never went into any actual detail:
WOLVERINE said:
More from WOLVERINE
WOLVERINE said:
Here's some info on various TKO catastrophies. Keep in mind that the X2C V1.0 is the same tranny as the MMR900:
pdp 93GT said:
only306 said:Please HELP!!! For three seasons I've been running a TKO 600 in my street/strip T-76 turbo mustang. The car weighs 3400#, 3.55 gears, 306cu and on a chassis dyno made 800hp 850tq. I've broke the TKO 5x now and I'm sick of fixing it. I want to put a somewhat bulletproof Turbo 400 and want some info about Bell housing, crank adapter, flexplate, driveshaft mods, crossmember, speedo cable mods, etc, etc.
Steed 93 has a fox with a TKO:
Steed93 said:
NigelTufnel said:
94scstang said:
94scstang's sig reads:
Big Jay said:
I have a point of contention about those supra getrag 6-speeds, though. They may be found behind 1000+ rwhp supras, but keep in mind that those cars are making that power at upwards of 8-9000 rpm. That means that they're making a lot less torque than the mustangs making the same power at 6-7000 rpm. That makes things a lot easier on the tranny.
Anyway, I hope this helps someone out there. Just because TKOs will not break in 98% of street built cars doesn't mean that it is a stronger design than the T56s out there. The two companies that have a great reputation are Rockland Standard Gear, and G-force. Going with the TKO will give you all the strength you need for now, and it will be cheaper. I personally wouldn't even bother paying the extra dough for the MMR900. They don't even have to weld the keys anymore. From what I gather, pretty much all they do is cryogenically treat them. It will not be stronger than one of these top of the line T-56s. If you want the best, bring your wallet. You're looking at more than $5k for the G-force and around $8k for the RSG Tranzilla.
Chris
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Cougar5.O
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onefastpony89
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- Jul 20, 2007
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if its a track car, go with a G-Force T5, if its a street car, the t56 will bwe so much more fun. Either way u go. It will be fun as hell
its not willful ignorance its documented fact but i didnt start this thread with a poll about obama and mcain i started it as a tranny poll if you want to debate this start a thread in off topic
well even 5k for a transmisson still makes me feel better, transmissions for my truck cost upwards of 7k but thats the price for wanting more than 800lbstq
no this in many accounts is a track car, like i said maybe drive around town to show off but thats it i'll either be drifting or hanging out corners as fast as i can
Very true. I have no doubt that there are plenty of 6 speed powerhouses out there. In fact I will be backing my 428 with a t56 one of these decades... hehe. I am just coming from the standpoint that it will be cheaper to build up a 5 speed to handle more power. Any time you stretch huge power over more moving parts, it does affect strength. Money being no object, anything is possible but I don't see the mustang as being a supercar though it can be made to contend with one.
Kevin
With all the bad I've heard about TKO500's and 600's I'd get a T56.
MY Cobra's stock T45 has been great for the past 5 years with a supercharger....I actually just had my transmission shop take it all apart for inspection. I needed a clutch and I have long tubes, so I figured better pay some extra cash for an inspection while it's out. They said they couldn't find anything wrong with it, so they put it back together with all the original parts. I don't power shift, or do 5,000PRM clutch dumps either though.
MY Cobra's stock T45 has been great for the past 5 years with a supercharger....I actually just had my transmission shop take it all apart for inspection. I needed a clutch and I have long tubes, so I figured better pay some extra cash for an inspection while it's out. They said they couldn't find anything wrong with it, so they put it back together with all the original parts. I don't power shift, or do 5,000PRM clutch dumps either though.
Friend of mine broke a TKO600 that was built for drag racing, had 2nd and 3rd gears hard faced, had the gears built with a "dog tooth" to make upshifts faster and easier, (a S.O.B. to downshift tho) ect. Had a Mcleod dual disc clutch blah, blah blah. Needless to say spent a ton of $ on trans and drivetrain. It worked real good for about 1 year and then 1st gear blew out on launch. I would venture to say a T56 would not have lasted much longer either as the car weighed 3,400 lbs, and made 625 lbft torque at the tires at only 2,200 rpm. 331 cid, Kenne Bell @ 18 psi (15 psi at the motor). So when all that torque hit the slicks when he dumped the clutch that 1st gear did not stand a chance. Rest of the trans still looks new, but 1st gear is toast. 
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