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Old 06-30-2009, 10:02 PM   #1
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Join Date: Dec 2006
Location: Springfield MO
Posts: 106
Car: 1989 IROC-Z
Engine: 383 waiting on afr 195 comps
Transmission: T-56
Axle/Gears: 3.42 Posi

Classifieds Rating: (2)
T56 behind a 496 BBC?

I have a t56 in my sbc car currently. I am building a mark vi 496 BBC. The engine is a 1 pc rms, and its internally balanced like my current sbc. From what i understand the flywheel and bellhousing should work fine. My question is what will i have to do to the trans to make it hold up to well over 500 ft lbs. What clutch do you suggest, internal parts ect. I plan to eventually use a 4l80e but want to try the 6 speed first. Any help is appriciated. Thanks.
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Old 07-01-2009, 05:38 AM   #2
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Join Date: Aug 1999
Location: Elkton MD, USA
Posts: 858
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac

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Re: T56 behind a 496 BBC?

The T56 is conservatively rated to 450lb-ft, so your 500 isn't beyond a stock unit. (If you lighten the car, even better..)

The common upgrades to the T56 in order are:
- Upgrade to Carbon fiber blocker rings
- steel 3/4 shift fork
- bronze shift fork pads (all 4 forks)
- billet steel synchro keys (3/4-definitely, 1/2-recommended, 5/6-optional, Rev-rarely)

- Upgrade 2nd gear with larger engagement teeth
- Upgrade to viper output shaft

The last two to take the T56 from ~700lb-ft to about 900lb-ft..

McLeod makes twin-disk clutches that will hold that much power.
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Old 07-01-2009, 02:58 PM   #3
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Join Date: Jun 2009
Location: Phoenix, AZ
Posts: 107
Car: 92 RS
Engine: 2000 454 Carb
Transmission: T-56

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Re: T56 behind a 496 BBC?

Could you guys help me out.
I am putting a T-56 bwhind a 454 Gen VI. There is a guy selling a flywheel from a mercruiser 454 Gen VI. Do you guys know if thie will fit.
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Old 07-01-2009, 07:18 PM   #4
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Join Date: Aug 1999
Location: Elkton MD, USA
Posts: 858
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac

Classifieds Rating: (2)

Re: T56 behind a 496 BBC?

Quote:
Originally Posted by GSRMmi31 View Post
Could you guys help me out.
I am putting a T-56 bwhind a 454 Gen VI. There is a guy selling a flywheel from a mercruiser 454 Gen VI. Do you guys know if thie will fit.
(Might want to consider starting your own new post instead of hijacking another..)

Does the Mercruiser have a T56 on it now? The LT1 T56 uses a different flywheel than most other transmissions, so even if the flywheel will fit, it won't work with a LT1 T56 unless it's designed for it..
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Old 07-01-2009, 10:53 PM   #5
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Join Date: Jun 2009
Location: Phoenix, AZ
Posts: 107
Car: 92 RS
Engine: 2000 454 Carb
Transmission: T-56

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Re: T56 behind a 496 BBC?

Relax bud it Was just a question. I appreciate your help.
Thanks
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Old 07-06-2009, 09:20 AM   #6
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Join Date: Dec 2003
Location: Newark, DE
Posts: 2,391
Car: '86 Camaro, '02 WRX, '87 K5, '67
Engine: 350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder
Transmission: T56, 5-speed, 700R4, C4, T176, semi-auto 2-speed
Axle/Gears: 3.73, 3.90, 4.88, 3.55, 3.54, 7.00

Classifieds Rating: (0)
Re: T56 behind a 496 BBC?

Nope, it won't work. Leave the boat parts with the boats. You need a custom flywheel from McLeod or Centerforce to match the imbalance of your 454.
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Old 07-07-2009, 10:48 PM   #7
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Join Date: Oct 2007
Location: Cleveland, OH
Posts: 354
Car: 87 IROC-Z
Engine: 305 TPI
Transmission: 700R4

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Re: T56 behind a 496 BBC?

Quote:
Originally Posted by GSRMmi31 View Post
Relax bud it Was just a question. I appreciate your help.
Thanks
Still considered hijacking :P
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Old 07-07-2009, 10:48 PM
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