When in 1st gear, my 4L80 shifts to second gear. I don't want it to do that. I want it to hold the gear it is in. My last one was like that.
Any tips on what to do. I am using the same tune for the "new" 4L as the old trans. I would rather do it internally than change the tune.
Thanks

 

That's absolutely controlled by the tune unless you use a full manual VB.

 

Agreed.
That is 100% tune-controlled unless there has been a major vb change

 

Its a super easy fix in the tune if you have HP tuners or know someone who does. or if older 93 to 96 Tunercat otherwise Transgo kit

 

I have HPTuners. I have seen the write up on Gen 3 computers using the Urban shift. I have a Gen 4 E38 and 2006 4L80. The Tune does not have the urban shift button. Is that the same as D2 ? I have Normal, D1, D2---Pattern A, D2---Pattern B, D2. Pattern B has the D2 populated with all 318 and not let it shift. Pattern A, D2 has all 0's except the last two cells. Is this where I need to shut off the shifting?
Thanks !!

 

Well if you're trying to get it to hold in D1...then you should look at the D1 table

 

My D1 table has 318 in it already. Last 4L80 that I had an it held 1st.

 

Sadly I am not that familar with HP in tuner cat its simply in a table that has M1 **** point and I just change it 100 mph and if you want to be able to downshift manually at any speed another place that shows max downshift to m1 speed .
Beyond that you will need someone with HP to answer that question.

 

Take a datalog and doublecheck everything
Log solenoids, tps, speed, and recognized shift position

 

SImple, put the gear selector in the "1" position.

 

LOL---not on a 4L80
I put 318 in the D2 box and now it doesn't shift to second gear.