Hi,
I have a 4L60E from a Camaro 1997 in Chevy Coupe -40. I'm having the common problem of hard upshift 1->2. I've found various suggestion on parts to replace, but they all seems to be related to having error code P1870. In my case I don't have any error codes at all. My question is, should I go for replacing suggested parts anyway or could it be something fatal with my tune (attached here)?
Thank you!