I believe 93 when they came out with 4l60E. Electronic trans control was added and went to a pcm. There are peramiters in the $od tunes to support 700r tcc lockup.
If you look for a 1994 k1500 that's the right one. 7427, or 6395, and another number I can't remember at the moment, all the same thing and will run the same chip. Parts stores carry them, but you would need harness connectors and a memcal, socket said memcal or buy the adapter from moats.
I'll see what I have in my parts stash, but I'll probably need to add that to the list.
If you have a scan tool, what are your IAC counts when good idle vs bad idle, and if you do a throttle snap test on those two things, what happens
I haven't checked in awhile. It's not a "bad" idle, its just what GM programmed the thing to do. Been tolerant of it for years, but every now and again I get irritated by it and miss how smoothly I could shift the Fords. Any throttle input will cause the ECM to command higher IAC counts, how much so depends on what gear it thinks you're trying to grab, if it's hot or cold and if the idle has come down or not yet. If it goes into "stall" mode it's even wonkier (idles real high) until it regains it's bearings & feels it isn't going to stall.
believe me tho the fords are not good at it L OL
I'll proudly drive either rig, but in the drivability category and in my experience, Fords are. I wouldn't mention them if I didn't think they did that better. Now, maybe its the difference between port fuel injection and throttle body injection, but I absolutely loved the 300 straight sixes I've had along with the 5.0 trucks. I want a 5.8 at some point, but now like the GMT400's, people want stupid money for an '88 to '97 F250/350. They all start up and quickly come down to 1000 RPM idle or less rather quickly. And if it's an automatic, you can put it in gear without having to ride the brakes to keep it from doing 20 mph+. They run smooth, the SEFI 302 in my Lincoln is silky smooth as well. Due to throttle geometry they don't snap your neck back when you touch into the throttle either. However, the Ford trucks of that era ride like chit compared to the GMT400 trucks. At least 2WD vs 2WD, which is all I can compare by actual experience. The '92 C1500 I had rode like a car, whereas every F150/250 I've had of that era rides like a tank, probably thanks to the I-beams. However, I still liked them. I'm especially fond the F-series' '87-'91 interiors, but '92 and up will let you plug a scan tool into it and stream live data. I bet the V8 Vortec equipped GMT400 stuff runs much like the Ford stuff does.
Hmmm I remember the calibration for a stick has a delay built in to keep the RPMs up there for easier shifting but, yours sounds different with that. What ECM are you running?
A 77.. something. I'll have to get back to you on that. I've never actually had to pull the ECM out, yet.