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is it a reliable unit ? I may try it on my next project

Ez TCU can run multiple types of transmission Including 4l80e 4L65 , 4L70 4L80 and 4L85e All those other transmissions need speed sensors to run. Make sure in your settings on the hand held TCU Programer you selected 4l80e and not one of those other transmission by mistake.

Check this out Step 1 to 8 how to put EZ TCU I don’t see anywhere that EZ TCU is asking for speed input.

They have a really good tech support If you call them they will probably tell you if you need external speed sensor or no

I have brand new EZ TCU here with me I’ll look into the manual today, but I don’t see why the TCU needs additional speed input, When transmission is already telling the TCU it’s speed those TCUs are designed to be stand alone for many older cars or trucks that retrofit 4l80e And most of...

My TCU Needed input from TPS sensor Input from RPM sensor power 12v from direct source tire size information Final gear ratio information no speed sensor information was needed

and yes on my m1123 I am using manual shifter Just like the one you bought, It was 60 dollar range, works great. if you don’t mind shifting like a manual transmission up and down

I don’t have any issues with EZ TCU I have been using since 2015 Shifts on point and low range works great, I am getting my RPM signal from magnet sensor on the balancer,