73-87 Chevy _ GMC Trucks > Suburbans
1991 Burban V2500 6.2L Diesel
VileZambonie:
--- Quote from: fitz on June 12, 2019, 06:10:15 am ---
--- Quote from: VileZambonie on June 09, 2019, 07:27:53 pm ---91 Suburban did not come with a 4L60E and why do you want to remove ECM?
--- End quote ---
What overdrive trans did they use in the 3/4 ton trucks in 1991?
--- End quote ---
700R4/4L60 or 4L80E
Stewart G Griffin:
If it's a 3/4 ton, then i think a 4L80 E.
Does the computer/ECM even control anything on a 6.2 diesel?
Deercreekfarm:
I crawled under it and it is a 4L80E transmission in it. The guy I bought it from obviously didn’t know what he was talking about.
My understanding is that the ECM controls throttle and shift points. Maybe someone anyone knows more than me and will chime in here.
As I mentioned before I want to delete the ECM and put everything back to mechanical. Just wanted to see if anyone had done that?
Irish_Alley:
you need a computer to shift that trans, doesnt have to be the ecu but it needs something. you can get a standalone box for it but they do cost $500+. its been some time but i thought the ecm on those is pretty much a stand alone computer and only reads inputs from the tps and rpms. i picked one up (ecu and wire harness for a 6.2 and 4l80E) a few years ago but never got around to messing with it. so why do you want to get rid of that trans besides the bad luck in the past?
Deercreekfarm:
I’ve had 85-87 year suburbans and the things last forever. I had a 90 suburban with the ECM and literally spent more time under the hood than behind the wheel and it always led back to the ECM. I found this 91 (last year of the square body) rust free, 4x4, 3/4 ton, diesel with barn doors and plan on keeping it but don’t want to fight with the stupid computer. I would like to delete it and do whatever it is I have to do to the engine and swap out the trans for an older mechanical model.
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