4L60/4L80E Gear Range Switch

[CTX-SLPR]

Howdy,

I'm messing around with planning how to get my 4T65E controller to run a 4L80E transmission. Going through the input listings on the transmissions, the 4T65E controller needs to see the gear range switch. The 4L80E shares this switch with the 4L60E mounted on the gear select lever. The pin labels line up, as do the wire colours, between the 4T65E and 4L80E switches but I wanted to see if anyone had any experience (or the logic tabels for) the 4L80E range switch since I can't find it online, just a pinout, to see if they have the same logic structure between them. Here's what I mean, the 4T65E switch logic looks like this:
Range/Pin(on the switch)
A/D: P, R, 2, 3
B/B: R, N, 4, 3
C/C: 1, 2, 3, 4
P/A: P, N, 1, 3
Grounded in each case.

Also if anyone has a used range switch and harness pig tail they'd be willing to sell I'd be tickled to get ahold of one, the local U-Pull-It yard doesn't have any and the other yards don't tend to want to sell things like that. Stupid wiring pigtail is like $76 new for one and $37 for the other!

Thanks,

[squirrel]

99 silverado shop manual. I'm surprised you don't have these books.

[TheSilverBuick]

The wiki shows the 4L60e shift pattern as well. http://en.wikipedia.org/wiki/GM_4L60-E_transmission

I think he is looking for the 4L80e? According to the MegaShift manual there is a difference.

http://www.msgpio.com/manuals/mshift/4L80E/4L80e.html

[squirrel]

Eventually you'll see the top of the page I took a picture of....

[TheSilverBuick]

Eventually you'll see the top of the page I took a picture of....

I read it, and I clearly mis-read it =P I thought it said 4L60. =/

[squirrel]

just messing with you

Here's the 4L60E page, different format, same info, but I'm not going to see if the logic is the same, that's left to the reader

[TheSilverBuick]

just messing with you

No problem, you're just the master of the obvious I probably wouldn't of looked it up had I thought it was the 4L80 info posted already But that MS site is pretty interesting, so all is good

[CTX-SLPR]

Thanks for the info, I honestly only have the factory manual for the 86/87 T-types and the Riviera itself. I've been using the Mitchell diagrams for most of the work.

To address what you're talking about TSB, a 4L80E and 4L60E have inverted shift solenoid B's and that info is listed in the GPIO diagram. I actually have that page bookmarked for refference. The shift range switch is mounted to the side of the transmission and has a different pattern to it.
I think translating the table Squirrel provided the 4L80E/4L60E looks like:
Range
A: R, 1
B: P, N, R, 4
C: 4, 3

That's a functional logic structure though quite different than the 4T65E. Looks like when I get my hands on a switch I'll have to test it just to be sure and probably put a logic converter circiut into the project box with the solid state relay for solenoid B.

[CTX-SLPR]

Thought I'd bring this up since someone, someday is going to hit this thread and see the posts and either get the wrong idea or be confused.

What Squirrel is posting is what Mitchell wiring diagrams is calling the "Automatic Transmission (Transaxle) Fluid Pressure Manual Valve Position Switch" Logic Tables. These are not the same as the "Transmission Range Switch" Logic Tables. The good news is that GM uses the exact same logic tables between the 4L80E and the 4T65E as far as the A, B, and C on the Pressure Manual Valve switch. What I really needed is the same is the Transmission Range switch logic tables. I've been able to decypher it from the diagram in the Mitchell wiring diagram for the 4T65E and it uses A, B, C, and P (Parity) switches. This diagram shows the pin outs for A, B, C, and P; but doesn't show the way the switch works on the inside to show the logic structure of the Range Switch.

Considering this logic table is not in the Hydramatic manual for the 4T65E, I'm doubting its in the Hydramatic manual for the 4L80E. I have the switch now so I tested it off of the transmission so I hit P, N, and 1 (L) and the logic from the 4T65E worked with the switch so I'm going to assume that the rest of it works and run with it.

4T65E	A	B	C	P
PARK	ON	OFF	OFF	ON
REVERSE	ON	ON	OFF	OFF
NEUTRAL	OFF	ON	OFF	ON
4 (OD)	OFF	ON	ON	OFF
3 (DRIVE)	ON	ON	ON	ON
2	ON	OFF	ON	OFF
1 (LOW)	OFF	OFF	ON	ON

KEY: ON = switch closed; OFF = switch open

Now I'm just going to have to repin the connectors or soulder the pigtails I cut off of a harness in the junkyard to the existing harness for the various different functions.

Temperature scales are the same from comparing the Hydramatic manual for the 4T65E and the Megashift link that TSB posted and this schematic pdf for the 4L80E.

The PWM frequencies are different
4T65E = 292.5Hz
4L80E = 614Hz
Since both are listed in A with the same range for 0-60% duty cycle (0.02-1.1A) and the control software table are in mA, should I be worried about driving the 4L80E force motor (pressure control solenoid) at 292.5Hz with much longer energized cycles?

Thanks,

[BigAL]

Since both are listed in A with the same range for 0-60% duty cycle (0.02-1.1A) and the control software table are in mA, should I be worried about driving the 4L80E force motor (pressure control solenoid) at 292.5Hz with much longer energized cycles?

Thanks,

If anything you'll burn it up, but the main thing I'd be concerned about is it applying the right line pressures, the 4l80e has low line pressures to begin with, one of the first mods they do is raise the pressure. In stock form the 4l80e will handle about 450hp, if you got more than that, you'll need to install a TransGo HD2 shift kit, also better clutches and steels, that will get it to handle about 750hp, over that you need to replace the drum, input shaft and a few other hard parts, then you're good to about 1200hp, though if you need over that, check this guy out. http://jakesperformance.com/4L80E.html

And here, this should answer a lot of questions about the 4l80e, if you havent' already found it.

http://jakesperformance.com/4L80E_FAQ.html

[CTX-SLPR]

If anything you'll burn it up, but the main thing I'd be concerned about is it applying the right line pressures, the 4l80e has low line pressures to begin with, one of the first mods they do is raise the pressure. In stock form the 4l80e will handle about 450hp, if you got more than that, you'll need to install a TransGo HD2 shift kit, also better clutches and steels, that will get it to handle about 750hp, over that you need to replace the drum, input shaft and a few other hard parts, then you're good to about 1200hp, though if you need over that, check this guy out. http://jakesperformance.com/4L80E.html

And here, this should answer a lot of questions about the 4l80e, if you havent' already found it.
http://jakesperformance.com/4L80E_FAQ.html

Talked to Jake himself today actually. He says I'll be fine with the Force Motor frequency of the 4T65E. I'll take his work for it.
He also recommended the HD2 shift kit from the start since it's a heavier car and I'm looking at eventually ~600hp with the right turbo. I'll take care of that when I change the filter and install the drain plug (if it doesn't have one) in the trans pan.