Tremec tko 600
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Instructor
Joined: Sep 2013
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Tremec tko 600
what do you guys think about the tremec tko 600? Im considering some of my future options and upgrades i would like to make with my 73' . i just finished getting car mechaiclly sound, now i have striped out the interior and cleaning everything and replacing what needs replaced. MY 73' has the 454 4-spd with 4.11 gears. i thought about changing the gears to 3.73 or 3.55 but ti realy like the snappy response the car has. S0.... that lead me to think about going to a 5-speed. are their any NEG or POS thoughts about doing his. i know its $3k for the tremec VS. roughly $500 for changing gears.
Instructor
Joined: Aug 2013
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From: Lantana Florida
I have a tko600 and 3:55 gears with 26" tall tires. The motor is a healthy 434 small block. First gear is kinda useless no traction at all. The trans has the 2:88 first gear too I think a 3:36 rear would work better for me. Had a tremec 3550 before with a 3:27 first gear really useless. I would launch in second instead. Just my experience.
Pro
Joined: May 2013
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I have a tko600 and 3:55 gears with 26" tall tires. The motor is a healthy 434 small block. First gear is kinda useless no traction at all. The trans has the 2:88 first gear too I think a 3:36 rear would work better for me. Had a tremec 3550 before with a 3:27 first gear really useless. I would launch in second instead. Just my experience.
thanks for this !
i've got the exact same set up ... 26.7 tire, 3.55 gears... in an 82 with a 700r4 with a roller/forged 355... (just bought and haven't taken possession yet, LastC3AZ's car)
I'm not an auto guy..so gonna have a shop switch to TKO600 or T56 before i even drive it..
Its a nitrous car.. prolly spray 200 on it...
So..your input of 1st gear being worthless is a huge point...
I guess...i'll have to gear it numerically lower...as well..
Looks like T56 has 2.66 first...and TKO has 2.87...is this right?
TKO...puts me at 50.68 mph in first (6500 r's)
T56 puts me at 54.68 in first...(6500 r's)
Instructor
Joined: Aug 2013
Posts: 105
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From: Lantana Florida
Yes 2:87 first gear not 2:88. When I had a mild 383 the gearing was perfect with the 3550 trans. Now I'm making a whole lot more torque probably 550lb give or take. And don't need all that short gearing in the trans. I'm sure that bb is making some good power. In 5th gear at 60mph I'm turning 2k on the motor anything less than that it starts bucking because of the cam I have so I don't see the need for a six speed at all. I wouldn't be able to use it till I hit like 85mph.
Instructor
Joined: Aug 2013
Posts: 105
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From: Lantana Florida
Another point to make is some people complain about poor shifts with these trannies. I've never had a problem with either one. Also I don't have a offset shift handle. I just switched sides between the boot and shift data plate. The only thing I lost was the ashtray door in doing this. After you have a overdrive you'll never go back to a four speed!
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Pro
Joined: May 2013
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Great drivability info RDCRIS...thanks... the bucking under load at 2k... is important...
How do you like the 434 small block? Thats a great build and costly !!
What kind of high end rpm do you spin?
LastC3AZ's car..that i bought has the tuned in crossfire... and it flows approx. 719 cfm total...so the 355 motor he built is at the upper limits of crossfire flow... (although on another forum..so me guy bored them like to 2 1/4 inches and flowed like 1150... was cool..
Have you sprayed your motor? What kind of compression are you running?
Fuel management (injected) or carb?
I love big stroked small blocks... good job!
How do you like the 434 small block? Thats a great build and costly !!
What kind of high end rpm do you spin?
LastC3AZ's car..that i bought has the tuned in crossfire... and it flows approx. 719 cfm total...so the 355 motor he built is at the upper limits of crossfire flow... (although on another forum..so me guy bored them like to 2 1/4 inches and flowed like 1150... was cool..
Have you sprayed your motor? What kind of compression are you running?
Fuel management (injected) or carb?
I love big stroked small blocks... good job!
Instructor
Joined: Aug 2013
Posts: 105
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From: Lantana Florida
I'm out of town for another week to share any pictures. I have the rev limiter at 7300rpm. And shift at 7000rpm or so. Yes it was a costly build. But it's been bullet proof so far I've had it since 2004 when I put it together. Dart block and heads all forged internals, shaft rockers solid roller 624/675 lift. It doesn't sound right until it hits 2000rpm people always ask if it has a miss fire going on. I say no it's hitting on all 8 just keep watching when I leave you'll understand then.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
what do you guys think about the tremec tko 600? Im considering some of my future options and upgrades i would like to make with my 73' . i just finished getting car mechaiclly sound, now i have striped out the interior and cleaning everything and replacing what needs replaced. MY 73' has the 454 4-spd with 4.11 gears. i thought about changing the gears to 3.73 or 3.55 but ti realy like the snappy response the car has. S0.... that lead me to think about going to a 5-speed. are their any NEG or POS thoughts about doing his. i know its $3k for the tremec VS. roughly $500 for changing gears.
Instructor
Joined: Aug 2013
Posts: 105
Likes: 0
From: Lantana Florida
George, I've spoken to you probably 10 plus years ago on here about our motors. I'm under a different screen name now. For the life of me I could not remember my screen name and the email address I used is long gone. Anyway what kind of rpm did you turn with the 4:11 gear at 60mph in 5th gear? If I remember you have a 335/40/17 tire? Which is about 27" tall?
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
George, I've spoken to you probably 10 plus years ago on here about our motors. I'm under a different screen name now. For the life of me I could not remember my screen name and the email address I used is long gone. Anyway what kind of rpm did you turn with the 4:11 gear at 60mph in 5th gear? If I remember you have a 335/40/17 tire? Which is about 27" tall?
I don't even put it in fifth till 60 mph or higher. I used a 7500 rev limiter with my 427 up until it broke the crank shaft.My present 434 has one of the best cranks and I lowered my rev limiter to 7000 just so it never happens again. I wish that I was in Florida today high of 25 today
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
How fast do you feel safe going?
4.11 is not a good high speed rearend because using OD trannies cause excessive dive shaft and pinion rpm. I run a drive shaft safety loop because I have exceeded 9000 shaft rpm at Bonneville Salt flats.
The local road racing track I've only got up to about 160 before I have to get on the brakes. Our Vettes take allot of work to safely drive over 175 mph. I always buy "W" and "Y" rated tires for the street and race tires like Salt flat tires were rated to 300 mph
4.11 is not a good high speed rearend because using OD trannies cause excessive dive shaft and pinion rpm. I run a drive shaft safety loop because I have exceeded 9000 shaft rpm at Bonneville Salt flats.
The local road racing track I've only got up to about 160 before I have to get on the brakes. Our Vettes take allot of work to safely drive over 175 mph. I always buy "W" and "Y" rated tires for the street and race tires like Salt flat tires were rated to 300 mph
Burning Brakes
Joined: Sep 2006
Posts: 1,242
Likes: 12
From: Kalispell MT
You should try living in NW Montana....
I'm running the TKO 600 in my '70 and it's a great upgrade. Like GKULL I chose the 0.64 5th gear for highway crusing behind a 555 cu in BB and a Ramadi 12 bolt rear end w/ 3.73 gears. The shift from 2nd to 3rd takes a little getting used to under high acceleration but very useable. Don't skimp on the clutch and spend the extra $ for a good SFI bell housing and you'll never have to touch it again.
Ray Y
I'm running the TKO 600 in my '70 and it's a great upgrade. Like GKULL I chose the 0.64 5th gear for highway crusing behind a 555 cu in BB and a Ramadi 12 bolt rear end w/ 3.73 gears. The shift from 2nd to 3rd takes a little getting used to under high acceleration but very useable. Don't skimp on the clutch and spend the extra $ for a good SFI bell housing and you'll never have to touch it again.
Ray Y
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Instructor
Joined: Sep 2013
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I was just hoping to see 130-140 mph
Don't think it will there with the stock setup, if it will!! then i must be scared of getting in the high RPM's.
I've had it 85-90 @ 4600-4800 RPM's and man does it seem like its pushing it
Don't think it will there with the stock setup, if it will!! then i must be scared of getting in the high RPM's.
I've had it 85-90 @ 4600-4800 RPM's and man does it seem like its pushing it