Title says it all. My 4l80 isn't hitting 4th and my converter is locking in 3rd.
It's a 80e transgo hd2 circle d 3200 and its at 3000 rpm at 75 locked with 3.42 gears. It should be down around 23-2400 from what I gather off online calculators. Any idea what could be going on in there?

 

having some of the same problems. converter will lock if I keep the shifter in "3"

mine shifts into 4th then around 55-60 it will tries to lock up then it kicks out

 

I from a manual and wonder if my tps needs adjusted, even though the motor was from a auto vehicle.

 

does it shift in to 4th gear at all.

 

Doesn't even try. Just gets up to 28-3000 rpm around 75 and the converter locks. The convert actually locks wile cruising ~50-55 and holds about 23-2400 rpm and I'm sertan its locki g cause I can roll into the gas and at ~50% throttle it shoots up to 3000 rpm and holds till the speed matches the rpms and then rpm starts to climb with more speed

 

Any one ha e any idea what mite be causing this?

 

Maybe the neutral safety switch on the side is clocked slightly off and the PCM thinks it's in "3" when actually in drive.

 

Didn't even think about that!!! Going to see about it now.
I even modified an early unit to take a nss with a home made bracket so it problem isn't set right.

 

Its clocked all the way to the park position were I think it should be and didn't change any thing.
Any other recommendations?