ok dont howl on me to much but no its not in a camaro, my camaro is a 700r4 thank god...


anyway i JUST bought a 1997 k1500, 350, swaped from a 4l60e to a 4l80e, drove it for 2 F'ING DAYS! all of a sudden... no reverse, no 3rd... and no 4th... and no tcc lock up, im at a loss, no codes besides 02 sensor.... i know NOTHING about these computer controlled trans missions....



side note: when i bought it on the highway it wont kick down into 2nd on its own.... with a scanner hooked up still rolling at 70 if you cleared the codes with would shift back up to 3rd and tcc would lock back up... if you put in in OD it would also shift back down to 2nd, so i left it in 3rd and rolled around..... if that makes any sence.... what did i get myself into...



truck has been tuned for the 4l80e i was told, and as a TCI? controller in the cab. not sure what its for but its there... reads trans temp and has a "shift mode" button which doesnt seem to do anything.

 

one other question.... to save me a hassle.... could i put a non computer controlled trans in this truck? say like a 700r4 or a turbo 400? for example? or would that screw with the computer?

 

You could put a 4L60 in your truck. There would be other things that would need to be done for the TV cable you would need. As for the computer, not really sure on that one.

I would say, stick with the 4L80E it's a stronger transmisssion. Maybe you should talk to the installer and have them warranty their work.

 

TCI has a 4L80E controller but they have other products. So:
it's not clear whether the truck is tuned for "Manual" and is using a second controller for the 4L80E but it might be.
Or it could be set up with a tune for a 97 4L80E truck.

How screaming a deal ddi you get on this truck?

 

i bought the truck already swaped from 4l60e to 4l80e, he said the ecu or ecm or whatever was tuned for the 4l80e, the input speed sensor was added into the harness since a 4l60e doesnt have one?


and i didnt get a good deal i got burned on it, traded a VERY nice 02 z24 for it, should have kept the car, oh well im stuck with it




does this sound like an internal prblem? bad clutch pack? broken band ?? or more or less something electric? i only have 1st and 2nd gear, no warning, no noise, truck was fine 10 mins prior....


i just need to know if im in for a rebuild or replace or a lesser fix



honestly if a turbo 400/350 would work in the truck without messing up the computer crap i would rather just do that but like i said i have ZERO knowledge when it comes to obdII computer systems

 

the tci controler i think just controlls the shifting... i have the box it just has different shift modes, its wires are tied into the ones going to the trans for the soleniods

 

Then get the F off the internet and do some troubleshooting.

Losing overdrive and going to a ******* orgasm transmission "because something is broken", without ever verifying what is broken, is dumb.

Troubleshooting may require acquiring, borrowing, or having someone do the scan work to see if the PCM is commanding a shift into 3rd. It may be, and there may be a Pxxxx code stored and there may not. As far as I know, the 4L80-E uses either a standalone (diesel and early gas engine use) controller or the full powertrain controller (which should / sounds like the case in yours if the swap is done as you seem to want it to have been done.)

This is a case where if you are going to pursue forum help, you're doing so in the wrong place on a potentially complex issue. And, buying the factory service manuals in hard copy would be a worthwhile investment. And doing a thorough step-by-step diagnostics routine is going be the rule, rather than "whoohoo, I found a thread with my answer in 15 seconds!"

Slow your roll and take it 1 step at a time. A 97 3/4 ton gas truck is extreeeemely well documented by the factory Helms manuals, including the drivetrain stuff. If your truck had the appropriate stuff to make it run the same way, it's a solveable problem. Yes, the 4L80E included an input shaft speed sensor; similar to a VSS at a tailhousing. The 4L60E did not have this.

As for "I think the TCI ....." Well, that's great. And it's called "another unnecessary step in troubleshooting." In this case, it would be better to not have that box involved. You're trying to skip all steps and come to a resolution. Yeah, it's nice the internet works that way A LOT but it ain't gonna work that way this time.

Good luck.

 

thanks for coming off as a dick, but also thanks for the use full information in that post



well it seems in reverse theres no line pressure, and the noise it was making determined an internal issue, so we pulled it and pulled it apart, the clutches in the direct drive drum were beat and the drum itself was broken...

anyway as far as the tci controler its similar to the one made by B&m but the name escapes me right now, all it does is control how hard the trans shifts..... garbage, so removed it


as far as the ISS sensor, the 2 wires going to it are pinned right into the computer under the hood, i dont have anyone with a scanner/programmer so checking the tune is something out of my reach, being its pinned right into the harness i would assume its been tuned for the 80e, only access i have is to a basic hand held code reader that does a few extra things like read live data, it has no codes,


were installing the trans now will let you know how it works



ALSO you mentioned TV cable, are they different 4l60e vs 4l80e, is the linkage on the throttle body different? do i need a corrector bracket for it to work right? i played hell with a 700r4 in my 85 monte ss that we put a 350 in.. so any help on the differences would be great, thanks all here

 

The 4L60E/4L80E doesn't have a TV cable. Shifts are electronically controlled.

 

I'm glad you made progress on diagnosis and repair.

With the elimination of the TV cable for the -E transmissions, it is very unlikely the TPS on the throttle body for a a '97 350/4L60-E is different than the one for the same year / engine / 4L80-E. Check the TPS PN for both and if same, you're good.

The 4bbl / 200-4R TV cable for the 85-88 V8 Montes should have been perfectly fine for the 700-R4 unless there was a carb or bracketry change; that's what I use w/ the Q-jet.

 

yea thanks for the tv info, im used to the 200/700r4 and non overdrive non electronic transmissions. waiting on a few parts to come in, decided to make some changes before reinstalling, thanks for the help all here at TGO