Which tranny would you get?

Rootus · Aug 1, 2004

Assuming equal price, which would you get and why -- TKO600 or T56?

swingline · Aug 1, 2004

I voted T56. I don't know if I would want it but a 6-speed would be pretty cool. I'm not sure what the TKO's are rated for but I have seen plenty of 500+RWHP T56-equipped cars.

Sleepy McNastee · Aug 1, 2004

I saw a guy in an MM&FF article (Redsurrection) with over 600 to the wheels and a T-56... I would love one.

Sleepy McNastee · Aug 1, 2004

Oh yeah and the guy was running like around 17psi through an afr 185 topped 347 ,and it was a 1994-95 car, so I was sold. But I have to admit I know very little about the TKO600...

swingline · Aug 1, 2004

I saw that red Cobra, it was sick. I am a cheap bastard so I'd go with whatever was cheaper unless the T56 wasn't that much more.

Rootus · Aug 1, 2004

The TKO600 is the latest version of the Tremec TKO. It's rated at 600 ft-lbs. There is also the TKO500, which is the latest version of the Tremec 3550, rated at 500 ft-lbs. Since the TKO600 is basically the same price as the TKO500, I'm not sure why anyone would get the 500...

Rootus · Aug 1, 2004

swingline said:
I am a cheap bastard so I'd go with whatever was cheaper unless the T56 wasn't that much more.

I'm a cheap bastard too . The T56 costs a couple hundred bucks more than the TKO600. I think it would be cool to have the extra gear between 4th and 6th, but not sure if it really has a practical value.

Mustang5L5 · Aug 1, 2004

On a stock GT, i'd get the TKO 600. You aren't making nearly enough power yet to take advantage of the T-56's gear ratios. You'd actually be slower

Rootus · Aug 1, 2004

Mustang5L5 said:
On a stock GT, i'd get the TKO 600. You aren't making nearly enough power yet to take advantage of the T-56's gear ratios. You'd actually be slower

"Stock" is a joke . And I'm planning ahead -- even if my T-5 weren't already coming apart, I am planning to make more than enough power next year to take care of it for good.

Dave

swingline · Aug 1, 2004

HairyCanary said:
I'm a cheap bastard too . The T56 costs a couple hundred bucks more than the TKO600. I think it would be cool to have the extra gear between 4th and 6th, but not sure if it really has a practical value.

You are already spending two grand so a couple hundred is just chump change. Do it right the first time and you will be happier down the road.

Sleepy McNastee · Aug 1, 2004

I guess he didn't wanna talk about that joke(highway gangbang).

mo_dingo · Aug 1, 2004

What are the gear ratios for both transmissions. That will tell the tale.

What do you trap at in the quarter? Will you need to change your rear end gears for either or both of the transmissions.

If the 6th gear is really really low, then it would definately justify having the 6th gear for highway, and 5th for street cruising. But if the 6th gear is near .64 like the T-5, & the TKO's 5th gear is near .64, then there is no point for having the extra gear.
Scott

Rootus · Aug 1, 2004

TKO600 gear ratios:
2.87, 1.89, 1.28, 1.10, 0.68

For comparison, TKO500 gear ratios:
3.27, 1.98, 1.34, 1.10, 0.68

T56 gear ratios:
2.97, 2.07, 1.43, 1.00, 0.80, 0.62

For comparison, T5 gear ratios:
3.35, 1.93, 1.33, 1.00, 0.68

So the T56 is a little taller in the final gear, but the "extra" gear is really 5th. I currently trap at 105, though once I figure out what's wrong with my setup I expect to bump that a little bit, perhaps to 110. But when I do my power upgrade, I want 125.

Dave

Sleepy McNastee · Aug 1, 2004

Do people shift into fifth gear at the track with a 6spd?

Sleepy McNastee · Aug 1, 2004

Like if they are running higher(numerically) gears and 120+ trap speeds?

OrangeMustangGt · Aug 1, 2004

all i know, is that if the t56 has a higher gear, that means i can run a higher rear-end gear and still cruse at the same highway speed, like maby i coudl have 4:10's and it would stay at the same rpm as my 3:73's on the highway. so this would make the car faster(if re-geared)... right?

Rootus · Aug 1, 2004

Sleepy McNastee said:
Do people shift into fifth gear at the track with a 6spd?

Shouldn't, unless you are making sick power. I cross the line in 4th, and it's 1.00 on both the T56 and the T5 I have now.

Edit: With the 3.73's, I would have to trap above 128 mph to require shifting out of 4th.

Dave

Rootus · Aug 1, 2004

GreenMustangGt said:
all i know, is that if the t56 has a higher gear, that means i can run a higher rear-end gear and still cruse at the same highway speed, like maby i coudl have 4:10's and it would stay at the same rpm as my 3:73's on the highway. so this would make the car faster(if re-geared)... right?

Changing the final overdrive to 0.62 and running 4.10's would give you similar results to running a 0.68 final overdrive with 3.73's. Not exact, but in the ballpark.

The question si really quite a bit more complex than that, though. You need to figure how the transmission gearing interacts with the differential gearing. They work together to produce an overall ratio at the wheels. I would not assume that numerically shorter gears are always faster.

Dave

Sleepy McNastee · Aug 1, 2004

HairyCanary said:
Shouldn't, unless you are making sick power. I cross the line in 4th, and it's 1.00 on both the T56 and the T5 I have now.

Edit: With the 3.73's, I would have to trap above 128 mph to require shifting out of 4th.

Dave

Hmmm. 128 is pretty high for a street car. Maybe the TKO600 is the way to go...How much cheaper is the TKO?

Rootus · Aug 1, 2004

Sleepy McNastee said:
Hmmm. 128 is pretty high for a street car. Maybe the TKO600 is the way to go...How much cheaper is the TKO?

Altogether I figure the TKO600 will run me about $2200. The T56 about $2400.

Dave

Which tranny would you get?

Which would you choose?

TKO600

T56

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