Transmissions and Drivetrain Need help with your trans? Problems with your axle?

t56 questions

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Old Feb 8, 2004 | 06:30 PM
  #1  
grover85's Avatar
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
t56 questions

Ok
I have purchased a t56 out of a 95 z28. The questions I have are,
-What flywheel should I use??
- Should I use an lt1 clutch???

The motor I have is a 2 peice rear main seal 355.
Thanks
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Old Feb 8, 2004 | 09:21 PM
  #2  
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Now would be a good time to upgrade that clutch. Go with a Mcleod, Centerorce, SLP, or spec stage II or III. I am not sure on the flywheels and that sorta depends on your final set-up. Try a search and see what other T-56 guys are using.
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Old Feb 8, 2004 | 11:06 PM
  #3  
ScreaminDeamin85Z's Avatar
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From: College Station/Spring, TX
Centerforce p/n 700107 for the 2 piece rear
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Old Feb 9, 2004 | 04:24 PM
  #4  
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From: Newark, DE
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
I chose a McLeod flywheel. They are available in steel or aluminum for this application. I would caution against aluminum. They can make the idle unstable.

I use a SPEC Stage III clutch too. It is a little much for a street car, but it never slips. Make sure to follow the break in recommendations religiously whatever clutch you use.
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Old Feb 9, 2004 | 07:02 PM
  #5  
grover85's Avatar
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Thanks for the help
A couple more questions are
What size clutch do I use does an 11 inch sound right??
Then if I use the 11 inch clutch all I need is a flywheel that can acomidate an 11 inch clutch right.
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Old Feb 9, 2004 | 08:09 PM
  #6  
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From: Tuscaloosa, AL
Car: 91Z, 91RS, '84 Jimmy
Engine: L98, 355, L98
Transmission: 700R, T56, 700R4
Nope. The '93-'97 T-56 uses a "pull style" clutch that is set up in a totally different way. The pressure plate bolt pattern is different, the friction area is different, and the actuation method is VERY different. To use an LT1 style T-56 you HAVE to use an LT1 style clutch and flywheel....or else change the input shaft and bellhousing and figure out a way to make the hydros work.

The aftermarket T-56 uses a T-5 style clutch, but if you already bought the trans then you're more-or-less stuck.

It *MAY* be possible to have a T-5 flywheel machined to accept the LT1 style clutch and pressure plate.....I don't know of anyone who's tried so I'm not sure.

FWIW I use the Centerforce 700107 flywheel and a SPEC stage 3 and absolutely LOVE the combo.
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Old Feb 10, 2004 | 12:10 PM
  #7  
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From: Newark, DE
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
You need an LT1 specific clutch/p.plate combo. A custom flywheel. An LT1 hydraulic setup, and you are all set. This is really the only way to do this right.
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