March 22, 2019, 08:12:28 PM

Author Topic: Check my T56-SBC plan?  (Read 646 times)

Offline FC355

Check my T56-SBC plan?
« on: May 22, 2018, 04:54:41 PM »
Hi all,
  I'm ready to put a T56 in my FC and want to make sure I'm getting the right parts/procedure, if someone can check me on this I'd appreciate it.  The previous owner made the car automatic, so I have to get everything for the manual conversion.   Thanks!

Block swap-
  I have a 1 piece rear main seal 350 in the car now.  I'm planning to install the transmission/clutch on that, then get a driveshaft (just installed 8.8).  Another month or so after that I'll be swapping the engine for a 2 piece rear main seal block.  I'll only have to replace the flywheel at that point, correct?  The driveshaft shouldn't need adjusting, right?

Parts-
  My understanding is using the parts below, I can still go with an OEM T56 and not have to buy a new (and very expensive) Magnum.  So what used T56 will be compatible with the following and not require any cutting to fit in the shifter location?  From what I've read it needs to be LS based, and the 92-97 f bodies will work?  Is there a compelling argument that justifies the cost of a new Magnum?

GM Hydramax hydraulic kit
Quicktime LS T56 bellhousing
Pilot bearing
Science Friction Billet steel 168T 11" flywheel (later will use the one for the 2 piece rear main seal when swap engines)
Science Friction 1126 stage1 mean street duo clutch kit

Offline digitalsolo

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Re: Check my T56-SBC plan?
« Reply #1 on: May 22, 2018, 07:44:18 PM »
92-97 F-Body is a SBC layout, not LS.    A T56 from one of those will bolt directly up (including clutch) to a 1 piece rear main seal SBC block.   If you have a 2 piece rear main block you need an adapter flywheel.

I'm not super familiar with the clutch/flywheel you listed, or why you need the Quicktime bellhousing.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...  project car
2013 Focus ST3 - Stage 1 BPU

Offline FC355

Re: Check my T56-SBC plan?
« Reply #2 on: May 23, 2018, 05:50:05 AM »
Ah, makes sense, thanks!  I'll look into that adapter flywheel.  The parts I've been looking at have been from American Powertrain and their parts are meant to work with LS compatible transmissions (like the quicktime BH for instance). 
I'll ask if AP's GM Hydramatic kit works on the older T56 as well, I know it's compatible with the LS again.

Is there a clutch that's particularly popular with this setup?  The SBC should put out about 400 (will dyno in the next month or so) and the car is gonna be for road racing track days and street. 

Offline FC355

Re: Check my T56-SBC plan?
« Reply #3 on: May 23, 2018, 06:06:33 AM »
Forgot to ask, for F body T56, do they all line up with the stock shifter location?  Or is that more dependent on what shifter you use/which particular model T56 I find/etc.?  Thanks.

Offline digitalsolo

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Re: Check my T56-SBC plan?
« Reply #4 on: May 23, 2018, 10:05:08 AM »
They're pretty close on the shifter location.   Most people use a Triax handle or an MGW unit clocked 90* to move the stick back a little.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...  project car
2013 Focus ST3 - Stage 1 BPU

Offline freeskier7791

Re: Check my T56-SBC plan?
« Reply #5 on: May 23, 2018, 03:05:24 PM »
why are you going to a two piece rear main seal block?  You should run a 153t flywheel as well, just use a flywheel for a 92-97 Camaro.  The starter won't clear the bellhousing otherwise.  You will have to make sure you get the crank and flywheel matched though since an LT1 is externally balanced.

Offline FC355

Re: Check my T56-SBC plan?
« Reply #6 on: May 23, 2018, 09:12:51 PM »
Thanks for the tips guys, appreciate all the advice.  So in an attempt to not confuse myself further, am I getting closer here?

1.  Buy a new 153 tooth starter.  Necessary regardless of which setup I go with, magnum vs LS vs F-body T56?  Or does going LS or magnum provision for the 168?
Currently it has the MSD Dynaforce 50951 168 tooth staggered on there.

2.  Buy a 153 tooth, external balance, flywheel for a one piece SBC if I want to run around on the engine in there now. 
Otherwise, buy a 153 tooth, external balance, flywheel for a two piece SBC for when I swap to my other engine. 

3. Buy  appropriate bellhousing.

3.  Get a clutch that matches the spline count for the T56 and 10.5" or 11" clutch pattern.

4.  Buy clutch actuater kit like the GM hydramax or the Chevy performance one below.  In these cases, the clutch actuator has to have some compatibility with the clutch I assume, does it also have to be specifically compatible with the T56?  For instance, the first is for the LS/Magnum, second just says Chevy.
https://www.summitracing.com/parts/awr-hmgm01201sr/overview/
https://www.summitracing.com/parts/nal-12559912
 

Offline DDv8

Re: Check my T56-SBC plan?
« Reply #7 on: May 24, 2018, 12:28:40 AM »
the t56 has 2 types of release bearings.
The sbc 92-98 fbody has external slave that is attached to the bell housing with a fork and bearing riding on input extension like a t5 or 4 speed https://www.summitracing.com/parts/nal-12559912  the parts in link are only the master slave and stuf  does not have fork or release bearing.   This list will work only if you have the early t56 bell housing.  exhaust may be close to the slave also.

the LS t56 has a hydraulic release mounted to the input bearing retainer with no release bearing pilot https://www.summitracing.com/parts/awr-hmgm01201sr/overview/

hybrid option         
LS T56   without bell housing
bell housing from old sbc  small 10.5" 153t or large 11",12" 168t  reference "large" see starter bump out on side (https://www.summitracing.com/parts/awr-bhcv10002/overview/) large bell will work for 10.5 clutch starter also
proper starter for tooth count
standard 168t or 153t flywheel for rear seal 1or 2 piece
small or large clutch with 26 spline count for sbc
adapter plate  https://www.summitracing.com/parts/mcl-8-207  this makes a LS t56 act the same as any 3-4 speed from GM
hydraulic release kit  for piloted release bearing  https://www.summitracing.com/parts/awr-hmgm01101sr/overview/  seems expensive 
alternative available  https://www.jegs.com/i/RAM-Clutches/798/78125HDK/10002/-1  plus clevis to fit pedal and master cyl rod   I rethreaded the stock one from m8 1.25 its really close to 5/16-24
the stock clevis may still be on the pedal as it is hard to remove

DD
86fc old school 327, T5, converting to 8.8 tbird

Offline FC355

Re: Check my T56-SBC plan?
« Reply #8 on: May 24, 2018, 06:41:02 AM »
Awesome, thanks DD!  Will chew through this all tonight.