That depends on when you actually first did it.


I think it has been 11 years for me...

 

I don't think it really matter to much who did it first as it seems we all did it a different way, Great minds as they say lol.

 

Frank,

We ended up discussing two different Transmission Models.


I brought up the THM700-R4 again, because @tayto was going to work on his own Deign for the THM700-R4...
I wanted to check on his progress...
And maybe give him some clues based on the Design that I use.

You then made your Post that I quoted above... because you have a Design also.
I have a feeling that we are doing the same thing.

Just like the 4L60E, the THM700-R4 releases the Overrun Clutch using the 4-3 Sequence Valve-Train (same Valve-Train used in both the 4L60E and THM700-R4).
Where we may differ is: Which fluid are you stealing and from what location.
Also with the 1982 - 1986 and Early 1987 Cores (No Auxiliary Valve-Body) There are 2 different ways that I have accomplished a Full-Time Overrun Circuit (ONLY Off in OD/ D4 once Up-shifted into 4th-Gear).
The Late 1987 - 1992 Cores, I only have 1 Method.

However the Diagram/ Images that I Posted were in regard to the 4L80E...
This is what Maroon Monster was also referring to.

We were talking about Full-Time Overrun without using an addition Valve (Like Sonnax produces).
He is definitely doing this differently, as he has the Overrun Clutch on in Reverse.
My Design does not work that way.

I am very curious as to what he did differently.

 

i said: "2. the 2 overrun clutch steels/plates add to the torque capability of the 5 forward clutches/plates when under load. so the difference is massive." and frank said that was correct.

now you say: "The overruns don't add to the capacity of the FORWARD clutch either."

so do they, like 7 clutches vs. 5 clutches, as has been mentione above, something like 40% more capacity or do they not? i really would like to be sure of how it is.

 

I've stated multiple times
NO
The overruns to NOT add to the capacity of the FWD clutch
The are on separate splines of the hub
The overruns ONLY add value in supporting the input sprag. That's it.
Hydraulically they add no value to the fwd
Clutch surface they do not add either

I can't make it any more plain

 

You can send a PM. I can explain to you.
I have this done in my transbrake 4l80e valve bodies and my non-transbrake valve bodies also.
Don't want to share with the world how it's done. It's more involved than the 60e method. And it's a neat design I don't think needs to be given free.
But it works to feed the overruns with oil in all gears and shifter positions (except 4th gear)
Exactly like the sonnax does

 

unfortunately not very far.... i relocated for work in January and havent had a shop since march so automotive stuff has grinded to a halt. i should pickup the 700r4 manual and have a go at it thanks for reminding me vortec!

 

Interesting I was looking into this at one time but didn't finish pursuing just didn't get the time. I did determine it was gonna be a bit more involved to do than the 4l60e or 700r4 and I decided the place I was at would not be interested in something that was much more involved. I mean I spent a week working on a valve body based transbrake like we discussed for a 60e and that was seen as to much time. So I abandoned that too. But a FT OVERUN for the 80E without that sonnax block would be nice.

 

Please go ahead and PM me when you get a chance.


My Shop is Completely closed.
I will not be building Transmissions anymore.

I have scaled everything back to a small home shop in my 3-Bay Garage.
Once I stop having Strokes (had a few more this past week)...
I will ONLY be offering GM Electrical Services (Connector Parts, Pig-Tails, and Harnesses).

I will need to turn to you or Frank for any of my Transmission needs.


I would also like to purchase a Separator Plate for a 4L60E and a 4L80E, as well as anything else cool that you have.

Thank you for continuing to contribute here, I know it can be very difficult at times (I experience it here too)...
But honestly we have some amazing Moderators also!!!

 

"The overruns to NOT add to the capacity of the FWD clutch":

so in the end, was i correct when saying: "in my imagination the sprag and forward clutch are "in series" (where the weakes link would set torque capability)."? the forward clutch strenghttens the sprag, so it doesnt fail first and now the forward clutch is the weaker link? (or another element in the trans.)

but then, what does sonnax mean by:

Prevents input sprag and Forward clutch failure by engaging overrun clutch in D4 1st, 2nd and 3rd Gears and D3 1st and 2nd Gears. (sonnax)

does sprag failure automatically make the forward clutch fail as well? if so, why?

(sorry for being so clueless about auto internals.)

edit: seems i also misunderstood "I would estimate that the overrun clutch can hold about 40% of the torque capability" (mrverdit). i quickly assumed the 40% was added to the foreward clutch capability.

 

The 40% is added to the forward sprag capability not the forward clutch.

 

Correct I think he missunderstoof my reply or i didn't make it clear enough, The overrun clutch piston is inside the forward piston and cannot add to hold to forwards

 

Damn, I hope you feel better soon. And sorry to hear about needing to close your shop.
We ALL hope you can still find the time and motivation to keep sharing your authoritative knowledge of GM transmissions here and especially your wonderful diagrams which have taught us so much.

 

no
Here is an analogy
Your truck is the fwd clutch
The chain hooked to it is the input sprag
The rest of the trans is a big load you're trying to pull

A stronger input sprag would be a beefier chain.
turning on the overrun clutch is like adding a tow strap with a bit of elastic to the chain. It will absorb some shock. And help support some of the load of the chain
That doesn't in itself make the truck any stronger or weaker.

You need the truck to work
And the chain to work
To have any fwd movement.
So, yes they both have to work
But no...a stronger input sprag, or turning on the overrun clutch...will not make the fwd clutch itself stronger.

If you were going to slip the fwd clutch aka if your truck was bound to get a flat tire...that will still happen regardless of how strong your chain is
If your chain breaks...it doesn't matter how much hp your truck has...you aren't pulling the load

That's about as good as I can do here without having an analogy so ridiculous it doesn't work at all

 

thanks, i guess i finally got it, its how i originally thought it was.

still confusing sonnax saying it prevents foward clutch failure.

edit: so to wrap it up, i was asking how much fluid would come out if you remove the plug. the corvertte only has a fill/check plug. so if the engine is running thats the level. if engine is not running, i assume the pan fills more. by how much?

 

Would depend on how much the converter drains so would be variable . To me ideal fill for a corvette is fill running till runs out. run through gears, Stop turn off let it sit a bit to allow air to come out of oil, Remove harness plug from trans , Start and place in reverse, add till runs out again , It now as full as it can possibly be, Reverse harness unplugged takes pressure to max possible pushing as much up into the trans as can be.. Clear codes after.
I played around with this on the dyno and you can add considerably more with this method.

 

so is it advisable to "overfill" it a bit? how much more would you add over the standard procedure? (i can always tilt the car, no?)

 

Na but the idea is to get it as close to pan rail running as possible and most important use the right filter with the pickup snout. You would be amazed how many times we would have corvette come back with shallow non corvette filters the customer had changed and the auto parts store gave them. And its not even the auto parts guys fault , for instance if you ask for a 2006 GTO filter you should get a deep truck type filter at autozone. But the first filter that pops up in the list on their computer is a shallow pan filter for the application even online. The second one listed is correct.

 

Thank you very much!


I have been severely Mentally affected...
My mind does not want to cooperate with what I need it to do.

I feel like someone removed the portion of my Brain where Creativity, Design, Processing, and Complex Understanding would be.

Everyday of my life, I have wanted to learn something new...
For the most part, I have been able to do so.

Now I have the same desire, but I am struggling to understand anything that I do not already Know or have a general understanding of.
I am very frustrated day to day as I feel Mentally Broken.

I have more free time now to contribute here...
However I am afraid that my declining mental status will render my being here as completely valueless.

 

@vorteciroc , you have contributed more to this board than most others can ever hope; your contributions are never "valueless."
When I check onto this place every day, I look at the latest comments, and there are several members that I ALWAYS read, regardless of the sub-forum. You are one of them.

The most important thing is that you are safe/ healthy. We all appreciate your contributions, and wish you the best.
This is probably just a rough patch, and things will get better soon.