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Winter T56 Upgrade Planning

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Old 12-06-2017, 08:49 AM   #1
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Join Date: Mar 2004
Location: Guelph, Ontario
Posts: 47
Car: 84 TransAm
Engine: Eagle 383 Stroker
Transmission: 700R4, 2400 Stall
Axle/Gears: 7.5 in 3.42 ratio Open


Winter T56 Upgrade Planning

Good day,

I am planning the upgrade of my 1984 Firebird Trans Am with a T56 and new rear Diff from a 1994 Z28 donor car.

The focus is the upgrade of the 700R4 to the T56 of course, but I am using that as an excuse to install some of the other 4th gen parts First I will start by stripping the donor car and i would like to check in with all of you fine folks to see if there are any useful parts I am missing that I can use and might be a worthwhile upgrade while I'm in there:

The other biggest question is choice of flywheel weight for primarily weekend driver, the standard mcleod is 30 lbs, i just wondered what others are running.

So here is my summary of project planning so far:

Strip parts car

• front and rear Brakes
• Springs?
• Transmission/slave cyl and shifter boot
• Clutch/brake pedal assembly
• Rear differential assembly
• Parking brake cables

From there I will then dispose of the rusty shell and do the following:

Check transmission parts

• Inspect Transmission and shifter (Suggestions on someone in the SW
ontario area anyone?
• Obtain new clutch assembly and correct flywheel for my 2 piece rear
main seal eagle crank 383 stroker $2-$400 USD
• New slave assembly
• New torque arm mount
• New torque arm mount
Modify tailshaft t56 to accept cable driven spedo
Then,

Check rear driveline parts

• Drain and inspect for wear
• True trac differential $410USD
• 4.11 ring/pinion $150USD
• New rotors, pads/calipers
• New parking back cables
• New Bushings
• New springs

From there I need to Prep Firebird for new parts

• Remove engine/tranny/rear end
• Disassemble interior center console and under dash areas
• Install SFC's ($199USD) https://www.spohn.net/shop/1982-1992-
GM-F-Body/Chassis/Subframe-Connectors/Tubular-Sub-Frame-
Connectors-T-Top-Hard-Top-Cars.html
• New transmission cross member (Sphon $119USD)
https://www.spohn.net/shop/1982-1992...Transmissions-
Accessories/Transmission-Swap-Crossmembers/T-56-from-a-93-97-
F-Body-Transmission-Crossmember.html
• Install rear Differential with new springs, brakes, ebrake cables and
shocks
• Install new 4thgen pedal assembly and slave cyl assembly
• Mount clutch/tranny/scattershield??
• Re-Install Engine/tranny
• Refresh front suspension, check for missing parts, adjust steering
box, new shocks and springs
• Install 4th gen front brakes if possible

So I am looking for input on the tranny inspection, flywheel resources, and I am in the Southwestern Ontario region if anyone knows someone good with the T56 to see if mine is ok or needs anything before I put it in.

Very excited, been trying to locate a tranny for years, now I have the whole donor car, yay!
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Old 12-06-2017, 09:19 AM   #2
jmd
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Join Date: Jul 2000
Location: Aridzona
Posts: 5,824
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R


Re: Winter T56 Upgrade Planning

You're low on $ for the 2pc RMS 93-97 T56 flywheel.

A never-rebuilt 94 T56 with a fair no. of km. on it can need a fair bit of work.
If it appears to have been serviced in the past, maybe run it as is, maybe you'll luck out for a season or more.

Personally, I would get the tq. arm mount off the tailhousing and onto the crossmember by investing a bit more there. Vibration can be an evil force. Trans. mount in rubber should vibrate far less and last far longer.

You're headed in a good direction with parts car and planning. Let us know how it goes.
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Old 12-07-2017, 07:43 AM   #3
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Join Date: Mar 2004
Location: Guelph, Ontario
Posts: 47
Car: 84 TransAm
Engine: Eagle 383 Stroker
Transmission: 700R4, 2400 Stall
Axle/Gears: 7.5 in 3.42 ratio Open


Re: Winter T56 Upgrade Planning

I have not looked into relocating the torque arm off of the transmission, since I’m buying An adaptor anyway perhaps it’s not much of a price point change for that, I will look into it thanks!
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Old 12-07-2017, 12:08 PM   #4
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Join Date: Aug 2008
Location: Lansing, Mi
Posts: 210
Car: One owner '88 IROC 50k
Engine: L98 with bolt ons.
Transmission: T56
Axle/Gears: 4:10

Re: Winter T56 Upgrade Planning

Holley has a nice crossmember that I just got for my T56 swap that mounts the tq arm on it and gives some small adjustment to the pinion angles. Also I like the UMI subframe connectors better myself. But that's just my .02
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Old 12-08-2017, 02:50 AM   #5
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Join Date: Mar 2001
Location: Illinois, USA
Posts: 4,223
Car: '89 Firebird
Engine: Usually
Transmission: T56
Axle/Gears: 3.73


Re: Winter T56 Upgrade Planning

Quote:
Originally Posted by daferris View Post
Holley has a nice crossmember that I just got for my T56 swap that mounts the tq arm on it and gives some small adjustment to the pinion angles.
That's not for purpose of adjusting pinion angle. Raising and lowering the front of the torque arm is a method of changing Instant Center. The pinion angle is a separate adjustment.
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Old Yesterday, 11:53 PM   #6
Junior Member
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Join Date: Mar 2004
Location: Guelph, Ontario
Posts: 47
Car: 84 TransAm
Engine: Eagle 383 Stroker
Transmission: 700R4, 2400 Stall
Axle/Gears: 7.5 in 3.42 ratio Open


Re: Winter T56 Upgrade Planning

Well next question, is it good to keep the springs as an upgrade or replacement? The 84 is overdue for springs and shocks, probably different spring rates but not sure if people have used them or not.
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Old Today, 10:25 AM   #7
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Join Date: Jun 2003
Location: Desert
Posts: 3,970
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: waiting to break


Re: Winter T56 Upgrade Planning

Buy new springs. Even the 1994's rear springs are about 24 years old now.
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Old Today, 10:43 AM   #8
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Join Date: Nov 2016
Location: Connecticut
Posts: 90
Car: 1991 Camaro RS
Engine: Hot 355ci
Transmission: Beefed TH350
Axle/Gears: 4:10

Re: Winter T56 Upgrade Planning

I got those spohn sfc and I wish I got the umi.
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