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Old 08-07-2018, 08:17 AM   #1
 
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Default SBC w/ 4T80 transmission - flex plate?

Hi All,

I signed up here after finding an epic thread discussing the 4T65E and the 4T80E.

I currently have a F23 manual mated to my SBC (running a 0411 pcm), there is a 1" adapter plate to allow this. I have the car apart for upgrades, and want to switch to an automatic, namely the 4T80E.

I found a source for the transmission, controller, and torque converter, but I am not sure about the flexplate.

The transmission guys I talked to said the adapter plate would influence the flexplate, and I've had my current setup for so long I don't remember what size the flywheel is or the toothcount (I reached out to the guy who last did some major work on my car to see if he remembers - I figured this info would be useful).

It'll be a rear-wheel setup. I want to make sure I can solve for the flexplate before I spend all the money on the other components, (or face selling them at a loss). Even if there's information I can't get until I have the transmission, as long as I know there is a person/shop that can make the flexplate once I have that info, I'll start buying the components.

Any thoughts/suggestions?
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Old 08-07-2018, 02:10 PM   #2
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Rear engine setup or? I bet wonder if a 4L60 flexplate would work from say a V6 Camaro
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Old 08-07-2018, 07:28 PM   #3
 
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Hi Rich,

Yes, mid-engine setup. This is in my Fiero.
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Old 08-07-2018, 09:16 PM   #4
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might get more action on this in the 3800 section

also we need james i think
@Turbocharged400sbc

the snowmobile twin engine guy would help too where he at
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Old 08-07-2018, 10:13 PM   #5
 
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Thanks Yaj Yak. I dropped in the general GM section as this was an odd combination. Hopefully one of the guys you mentioned sill spot this and share their thoughts.

I am in Chicago for about a week, are there any regular meets or anything going on between now and next Tuesday morning?
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Old 08-07-2018, 10:40 PM   #6
 
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Oh, I did learn tonight that my current flywheel has a 142 tooth ring gear, which is the same tooth count as the the 4T60, 4T65 & 4T80 transmissions.

My engine is internally balanced. So is it possible to get a flexplate from a 3800 (or northstar GM that had the 4T80), and have it drilled/balanced to bolt up to the SBC?

I think at that point the biggest concern is the thickness of the flexplate, to compensate for any adapter plate? Or can I use spacers to move the flex plate the right distance from the engine? (or, as seen at about 8:30 into this video, he says they can use washers to connect the flex plate to the torque converter if there is too much gap - ).

And of course I need to make sure the diameter of the flex plate clears the block and the bellhousing, though I think if I'm using a flexplate that goes with that transmission, that shouldn't be a concern?
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Old 08-08-2018, 08:13 AM   #7
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I know Fiero guys have done SBC's before so they might be the ones to ask
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Old 08-08-2018, 08:26 AM   #8
 
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Hey Rich,

Thanks, yes! I have been part of the Fiero community for a number of years. The trick here is that none of them have used the 4T80. The most common is the 4T65. So I'm in some uncharted territory right now.

I might buy the stock 4T80 flex plate, just so I have something to check clearances around the SBC block. I've emailed TCI and asked them if they'd be able to make me a flexplate with the right pattern for the SBC, telling them it'll likely have a 1" adapter plate between the trans bellhousing and engine (my F23 manual has the same bolt pattern as the 4T80, and I figured I can reuse the same adapter plate).

Fingers crossed.
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Old 08-08-2018, 08:29 AM   #9
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you talked to triple edge or no?
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Old 08-08-2018, 09:12 AM   #10
 
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Yes, they are building the transmission for me (great guys to talk with). He had the same concern, he wasn't sure where I could get a flexplate for this setup. He recommended someone to me, and I reached out, but no joy yet.
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Old 08-08-2018, 09:24 AM   #11
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Who makes the aluminum flexplate? can you try to buy one not drilled and get the correct patterned drilled into it?
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Old 08-08-2018, 09:32 AM   #12
 
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Hey Rich,

That might be the final solution, I'll see what TCI says (hopefully they email me back).
To Triple Edge's credit, I found out today that Dave took the time to call V8 Archie (the company I originally got my engine/trans adapter plate from years ago) and they said they might have a solution, so I've reached out to them, too.

I'm super impressed at Dave's customer service with this project - and I really appreciate the responsiveness and ideas you guys have been giving me, too.
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Old 08-08-2018, 05:42 PM   #13
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Quote:
Originally Posted by Trinten View Post
Thanks Yaj Yak. I dropped in the general GM section as this was an odd combination. Hopefully one of the guys you mentioned sill spot this and share their thoughts.

I am in Chicago for about a week, are there any regular meets or anything going on between now and next Tuesday morning?


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Old 08-08-2018, 06:30 PM   #14
 
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Thanks! I'm staying down by Tinley Park, I'll try to roll up that way if time allows!
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Old 08-17-2018, 06:36 PM   #15
 
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So I have some good news! Meziere will make the flexplate for me! They make billet SBC and billet 3800 flexplates (so they are familiar with the right bolt pattern and tooth count).

They want me to send them my flywheel so they can make sure they get everything spot on. And the cost of having them design it was very reasonable!

So I had another question around this, I'm running the 0411 PCM, and was originally going to buy a stand alone transmission controller, but someone told me that I could setup the 0411 to control this transmission, but I would need a baseline of the transmission parameters from a car that came equipped with this transmission.

I'm using HP Tuners. Does this sound right/possible? It would save me about a thousand bucks if it's possible.
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Old 08-17-2018, 09:15 PM   #16
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Quote:
Originally Posted by Trinten View Post
So I have some good news! Meziere will make the flexplate for me! They make billet SBC and billet 3800 flexplates (so they are familiar with the right bolt pattern and tooth count).

They want me to send them my flywheel so they can make sure they get everything spot on. And the cost of having them design it was very reasonable!

So I had another question around this, I'm running the 0411 PCM, and was originally going to buy a stand alone transmission controller, but someone told me that I could setup the 0411 to control this transmission, but I would need a baseline of the transmission parameters from a car that came equipped with this transmission.

I'm using HP Tuners. Does this sound right/possible? It would save me about a thousand bucks if it's possible.
https://sites.google.com/site/sloppy...ans-controller

Usually Denmah seems pretty spot on.
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Old 08-18-2018, 12:32 AM   #17
 
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Thanks for the pointer, Mr. Roboto!
I skimmed through it, and found a forum run by those guys and posted up some questions over there about getting a file for my transmission to use on my PCM.
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Old 08-18-2018, 02:56 AM   #18
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A point/question I am likely to make is are you running the 0411 for EFI? If so have you seen if you can segment swap in the 4T80E code? It may drop in, not entirely sure.
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Old 08-18-2018, 07:30 AM   #19
 
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Yes, that's it exactly. I've had the 0411 managing the engine (and feeding the instruments/idiot lights) for about 4 years.

What you are asking is exactly what I'm wondering about, and trying to find someone who has that chunk of code. I know there are guys here that run the 4T80E, but not sure how many have HP Tuners. I was hoping someone could email me the file or point me to where I could find it.

I tried google, but have only found leads on making this PCM work with a Northstar engine, and still no code yet, just feasibility discussions.
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Old 08-19-2018, 09:38 PM   #20
 
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So I got a great update!

The recommendation was pretty solid. They suggested I get the ATSG manuals for the 4L60 and 4L80, and see which one has the closest solenoid pin-outs to the 4T80. Change the wires and then upload the tables for 4L## I lifted the pin-outs from. This will let me use my 0411 PCM to manage the transmission as well as the engine!

Also split the engine and my manual transmission today, and pulled my flywheel. Going to send it off to Meziere (hopefully tomorrow) so they can take the measurements they need and crank out my flex plate!

Thanks guys for helping me out with the ideas and pointers to the right resources.
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