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I came across a simple way to control a 4l80e
- Thread starter Big Ray
- Start date
Vombrown
Mountain Man
That looks like a slick setup
Damn, you hear that engine take off? Oooooo
Thanks for posting that. I am grabbing a free 96 g30 van with a 4l80e to stick in my Buick.
Did I see that correctly? 70mph in first?
Keep in mind that the 400/4l80E has a pretty tall first gear compared to the 350/700r4/4l60E. It's a trade off I guess, durability vs crawler first gear
4L80-TH400- TH350 all run 2.5 first (give or take decimals). 700/4L60 is 3:1. Most old school autos like the 727 and C6 also run around 2.5:1 first gear. 70mph in 1st with any of them will take some tall axle gears and a lot of engine rpm!
Yep. could not remember the exact gear ration but that sounds about right. I was thinkign the TH350 has a identical as the 700/4l60e but according to this it's different from both the runs...
Courtesy of http://www.oldengine.org/unfaq/leadfoot/trans.htm
Automatic Transmission Gear Ratios
1st 2nd 3rd 4th Reverse
GM
Powerglide 1.76 1.00 1.76
TH350 2.52 1.52 1.00 1.93
TH400 2.48 1.48 1.00 2.00
200r4 2.74 1.57 1.00 0.67 2.07
700r4 3.06 1.62 1.00 0.70 2.29
4L60E 3.06 1.62 1.00 0.70 2.29
4L80E 2.48 1.48 1.00 0.75 2.08
Courtesy of http://www.oldengine.org/unfaq/leadfoot/trans.htm
Automatic Transmission Gear Ratios
1st 2nd 3rd 4th Reverse
GM
Powerglide 1.76 1.00 1.76
TH350 2.52 1.52 1.00 1.93
TH400 2.48 1.48 1.00 2.00
200r4 2.74 1.57 1.00 0.67 2.07
700r4 3.06 1.62 1.00 0.70 2.29
4L60E 3.06 1.62 1.00 0.70 2.29
4L80E 2.48 1.48 1.00 0.75 2.08
454Sub
5/8 ton status
That is literally brilliant. And now that I seen that I regret my Transdapt kit.
HP Tuners is still a pretty significant investment (around 500 bucks I think), but it's been common knowledge you can do some pin switching between the 4l60e and 4l80e wiring harness to control either with an LS swap. If you can offer up the inputs that would normally be provided by the LS sensor pack it seems like it would be much cheaper and easier to make your own harness apart from all the stuff in a LS engine harness to control the 4l80e. Not sure how easy it will be to provide a CPS and TPS from a non LS motor without additional expense. I think the tasks involved negate it being cheap (and probably not truly easy) in the long run.
Quite a bit of DIY engineering to try and navigate a way around the manual valve body or a seperate controller unit but perhaps if you were combining this with something like a FITech unit or something similar it could be much easier...
Quite a bit of DIY engineering to try and navigate a way around the manual valve body or a seperate controller unit but perhaps if you were combining this with something like a FITech unit or something similar it could be much easier...
454Sub
5/8 ton status
A non 80e harness (my 90 2wd 1/2 harness) for example has the TPS and so on that the signal can be borrowed from. The only downside to this setup is having an OBD1 port for engine diagnostics and OBD2 port for tranny diagnostics. Plus having to come up with a nifty Check Tranny light in the cluster.
Is a check tranny light even a thing?
Well, this is the 21st century....
Why is there little on the 4L80E controller that was behind the non-electric diesels?
GM used them, and the HMMWV's with 4L80E all use them (although I think those TCM's are from another manufacturer, or redesigned by someone else). I would think they would be a fairly desirable piece to have. Perhaps something about programming them?
Pointless in an EFI swap if you are running something that already had a PCM to control it, but for an "E" trans behind a non-efi engine, it would seem logical to me.
GM used them, and the HMMWV's with 4L80E all use them (although I think those TCM's are from another manufacturer, or redesigned by someone else). I would think they would be a fairly desirable piece to have. Perhaps something about programming them?
Pointless in an EFI swap if you are running something that already had a PCM to control it, but for an "E" trans behind a non-efi engine, it would seem logical to me.
superbuickguy
1/2 ton status
excellent - thanks for posting this
That's some good info to consider for sure. I guess it breaks down establishing when the 4l80e went into service and what all it went in to. Would be nice if we could just go raid army surplus parts to find the mystery boxes!!!
