LOWnEASY

iTrader: (1)

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?

Chevy_King1500

iTrader: (7)

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

LOWnEASY

iTrader: (1)

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

Chevy_King1500

iTrader: (7)

does it shift in to 4th gear at all.

LOWnEASY

iTrader: (1)

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

LOWnEASY

iTrader: (1)

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

James B.

iTrader: (1)

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

LOWnEASY

iTrader: (1)

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.

LOWnEASY

iTrader: (1)

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