91,, 2500 with 4L80 (I think) Is there an electronic controller for the 4spd auto??? 4spd would be nice with 4.11 or 3.73s???
Printable View
91,, 2500 with 4L80 (I think) Is there an electronic controller for the 4spd auto??? 4spd would be nice with 4.11 or 3.73s???
Yes, the 4L80-E, in its introductory year of 1991, did indeed require an electronic control module.
https://www.powertraincontrolsolutions.com/ sells aftermarket kits that make it possible to install a 4L80-E into a non-electronic vehicle... not exactly cheap, but good stuff. Some have adapted the wiring and TCM from an older vehicle, but it's harder to do though a lot cheaper - when you can find the parts.
Analyze your towing requirements, which will help you decide what differential gearing would be best for fuel economy and overall vehicle performance.