Vetal

iTrader: (3)

I want to try manually locking TC with a switch, do I put +12V or ground to TCC wire on 4L80E?

slow67

iTrader: (2)

Ground

Vetal

iTrader: (3)

slow67, thanx. It's great there are people like you here.

Vetal

iTrader: (3)

Just thought today... Isn't it dangerous to put ground on TCC pin when PCM doesn't expect it? Couldn't it fry PCM?

joecar

No...

the PCM either floats that pin or grounds it.

AGearHead4Life

iTrader: (5)

Was wondering if the convert unlock issue is only with a stall?

Doing the 4L80E swap now and wondering which route to take.

THanks

slow67

iTrader: (2)

Likely not an issue with a stock stall (as long as your pcm can run a 4L80E natively).

Ford_Assassin

iTrader: (4)

I am going to be running a 4L80e in my K5 behind a 5.3 using a 2001 4.8 PCM '411'. Running a stock GM 'High Stall' (whatever that means, says it on the box) reman converter.

My tuner emailed HPT to segment my tune (still waiting), but I wondered if this mod is the way to go instead. I def don't want my converter unlocking everytime the TPS reads 0%.

Would you mind PM'ing the details NOT posted here, including your second thoughts?

Thanks!!

Vetal

iTrader: (3)

As far as I know, all 4L80E tunes unlock TC below 5% throttle...

slow67

iTrader: (2)

I can't guarantee the 60E tune will be a fix for this, as many truck tunes from GM also for the 60E tune. If you can get a segment swap to a 60E car OS, you might be in better shape.

Ford_Assassin

iTrader: (4)

Might not need to segment afterall. I totally forgot I had a 2001 Silverado 2500 (6.0/4L80e) PCM on the shelf (411).

I have HP Tuners Pro myself, but I'll be the first to admit I am no tuning pro. I mostly use it for shift point, idle RPM, and other minor changes.

Anyway, since the PCM was already used for with a 4L80e, no segment changes are needed correct?

slow67

iTrader: (2)

Correct, just make sure the harness will work with a 80E (or a 60E harness modded to control an 80E, like stock).

Ford_Assassin

iTrader: (4)

Yup. When I ordered the harness I had him build it for use with a 4L80e (ISS sensor pigtail included).

I started it today for a few seconds (with the VATS and EGR disabled), but its pig rich due to having 8.1 Marine 42# injectors.

meersy

I am doing a ls1 and 4l80e into a land cruiser and are in desperate need for some info about shift sequence programming. Any help would be appreciated.

89LS1FOXER

iTrader: (47)

Sent my Convertor in Yank this winter for a cut and clean, was told that my lock up clutch was worn and needed replaced, he asked if i had it locked up on the dyno or some highway pulls but Zippy doesn't lock it up as far as i know, could the pwm's slow engagement be the cause of my lock up clutch wear?? I drive this truck daily most of the time with a 3600 stall, i can't recall having a problem with feeling it unlock all the time but i don't like how it locks up at lower speeds like around 45-50mph, it makes the truck feel very sluggish on the highway until you get over say 60 mph then its fine.... and then you just about have to floor it to get it to unlock lol. Mine is a segment swap with the two wires switched and the added ISS.

slow67

iTrader: (2)

Its possible, but if you have tuning software, just make the the TCC duty cycle 100 for both minimum and maximum.

the404man

i have been reading over most all your postings Slow67, though i may not completely be understanding, feel i am very close and need a bit more help, ok, you say that, to run a 80e on a 60e tune will allow for TC to remain locked at 0%TP, ok, so my 2004 truck TCM allows for the choice of many transmissions one being the 60e, my question is, if i set the TCM to 60e and transfur the shift settings from the 80e will my TC remain locked at 0%TP :pray: or would i need to also change something with the trans plug wires? Thanks

slow67

iTrader: (2)

There is more to it than that, also I can't guarantee that the truck 4L60E tune will stay locked up. Some Truck OSes unlock the 60Es at 0% TPS also.

swolbynos

Hey Slow, are you still giving the details on how to make an 80e work without the segment swap?

mrvedit

Thanks for bringing this interesting thread to the top again; I never knew about it.

Besides disabling the 3-2 shift solenoid code and a few others, a 4L60E tune would at least require changing the shift points as the 4L80E has different gear ratios. I also would like to know what else is needed besides the trivial cable-pinout change.