How to stop upshift from 1st to 2nd while in 1st gear 2003 silverado 4L60

[mvvette97]

Hey guys is there a way to keep my truck from shift out of first while my gear selector is in the first gear location? I was goofing around today and had my tires covered in mud so I pulled out on the hard surface and pulled it to 1st on the selector and held the brake and hammered down, haha. Even though I was in first it still upshifted to 2nd gear while the gear selector was still in 1st gear. It won't hold low gear. I thought I had it set to hold first gear but I must of missed something.

[Taz]

My original answer (which I deleted) referenced 4L80 transmissions - sorry about that - never post while drinking the first coffee of the day !

Your 4L60 tune looks OK - were you in 4WD mode by chance ?

[joecar]

OP's other thread (I'll merge it here later): How-to-stop-upshift-from-1st-to-2nd-while-in-1st-gear-2003-silverado


(https://forum.efilive.com/showthread.php?26842-How-to-stop-upshift-from-1st-to-2nd-while-in-1st-gear-2003-silverado)