GM automatic

[Warren Stramer]

I have a girdle in the works, I'll post up pics when I get a few minutes.

Good to hear, I have one designed too. I dont think the case will be the limiting factor.

[turbovanman²]

Good to hear, I have one designed too. I dont think the case will be the limiting factor.

What do you think will be then?

---------- Post added at 05:03 PM ---------- Previous post was at 05:03 PM ----------

I have a girdle in the works, I'll post up pics when I get a few minutes.

How about now?

[Reaper1]

It is converted to a 3 spd, so no need to worry about overdrive. Trans controllers for these are easy and simple. There is no adaptive crap. It can actually be shifted with 2 toggle switches. Obviously, not for racing, but it is simple.

OK...no OD, so in that respect it's no better than the A413. The aftermarket controllers for the A604 don't incorporate adaptive controls either that I've seen or read. Maybe Brent knows more than I do on that anymore as I've kinda been out of the A604 thing for a bit. I do know the aftermarket controllers can either shift automatically or with buttons as well. If you take all that into account, building a race ready A604 would be not only cheaper, but easier to do than adapting another company's transmission.

I have a girdle in the works, I'll post up pics when I get a few minutes.

Good to hear, I have one designed too. I dont think the case will be the limiting factor.

Great minds think alike!

[RoadWarrior222]

The A604 is an all out electronic tranny, the GM trannies are mostly electrically operated hydraulic trannies, like an A413 with a solenoid valve body in. Mostly I think they work by two solenoids, and the various positions, off-off, on-off, off-on and on-on give the four gears.

[Reaper1]

The A604 works very similar. The solenoids are only pulsed in order to achieve a smooth clutch engagement for soccer moms. It's been tested and proven the A604 can be shifted simply by activating the solenoids by switches.

[RoadWarrior222]

I was under the impression however, that in stock form, it wasn't built to handle to shock loads of doing so, thus "required" the electronic control, to (theoretically) live.

[Reaper1]

Well, you are correct, but we are also talking about a transmission that is to be used behind an engine that is going to be making upwards of 500+hp (or more), so I'm betting the internals won't be in stock form.

[black86glhs]

It wouldn't be cheaper if you are going thru 2 or 3 413's versus the 4T65. I'm not bashing the 604 or 413 here. It was just pointing out that the 4T65 are living at as high a power level and higher after the mods. They aren't putting girdles on to try and make them survive.
The number of gears don't matter. The powerglide only has 2 gears but is the tops in the 1/4 mile.

---------- Post added at 10:33 PM ---------- Previous post was at 10:32 PM ----------

Well, you are correct, but we are also talking about a transmission that is to be used behind an engine that is going to be making upwards of 500+hp (or more), so I'm betting the internals won't be in stock form.

Then it won't be cheap.

[RoadWarrior222]

Why does it seem like we might be comparing A413s that might have had a couple of tricks and a hundred bucks spent on them to GM or other trannies that had several bagfuls applied with several thousand bucks.

[black86glhs]

Why does it seem like we might be comparing A413s that might have had a couple of tricks and a hundred bucks spent on them to GM or other trannies that had several bagfuls applied with several thousand bucks.

This is a full race prep 4T65, not like the adjustments on the 413's. A 413 doesn't live long over 500 HP even with the cheaper adjustments. The race prepped 413's are not just turned up line pressure and an extra fiber/steel, either.

[turbovanman²]

The A604 works very similar. The solenoids are only pulsed in order to achieve a smooth clutch engagement for soccer moms. It's been tested and proven the A604 can be shifted simply by activating the solenoids by switches.

No, you can't turn it on with simple switch's, if you do that, the shifts will overlap and then you'll get 2 gears at once for a split 2nd, and that's most of the issue with shifting this tranny, retarded really,

[Vigo]

I really wanna see these girdles. After the internal bracing for the pinion bearing, i think it's the next big step.

[Vigo]

there's some 4t60 vs 604 stuff in here so this seems relevant.

I just tried to explain why a 4t60 can run on switches and a 604 needs an actual computer, starting at post #30.

http://www.turbo-mopar.com/forums/sh...567#post876567

[RoadWarrior222]

This is a full race prep 4T65, not like the adjustments on the 413's. A 413 doesn't live long over 500 HP even with the cheaper adjustments. The race prepped 413's are not just turned up line pressure and an extra fiber/steel, either.

Yah, but we're calling out the A413 for weak parts that are upgraded to 300M material on a built 4T65, so, what's wrong with putting them bits in an A413 is all...

[turbo2point2]

Not done obviously, but this is where it sits...

Have a few more parts to machine to continue.

[RoadWarrior222]

Whew, that looks like something you'd use to convert your cummins HD truck to FWD

I'm curious as to what all is under that side case there, and if you've got any weak rejects, (Kinda been tossing around the idea of an overdrive)

[Warren Stramer]

Not done obviously, but this is where it sits...

Have a few more parts to machine to continue.

Nice work Brian. That is similar to what I'm doing, but I'm going to machine a billet back diff cover that ties the bottom plate and a beam from the top of the diff cover to the upper two bolt bosses on the bell hsg.
Mine wont be done till spring, your way ahead of me.
I still have not taken the time to contact Mark Williams, have you?

[turbo2point2]

Nice work Brian. That is similar to what I'm doing, but I'm going to machine a billet back diff cover that ties the bottom plate and a beam from the top of the diff cover to the upper two bolt bosses on the bell hsg.
Mine wont be done till spring, your way ahead of me.
I still have not taken the time to contact Mark Williams, have you?

This design will also use the billet diff cover that Lengel is making. It will be fastened to the pan rail girdle and also at the top with a strut to the bell housing as you mentioned. I am in the process of making the upper strut.

I haven't tried MW yet either.

[turbovanman²]

Nice work. One question though, what's with the transfer gear cover? I don't think anyone have damaged that area or do you have some custom gears under there?

[RoadWarrior222]

Yeah that's what I was curious about, transfer gears and the cover or case over them...

(Every time I decide to say transfer gear, everyone else in the thread says "DYM side gears?" and vice versa)