Manual/TS 4l80 stuck in limp mode

[85raiderburban]

Finished my 4l80 swap a few days ago. On the case connector, i have 12v to Pin E and Solenoids A and B grounded to toggle switches in the interior. She remains stuck in limp mode (2nd gear only).

this is how Ive got it wired
https://www.youtube.com/watch?v=u1bA2pPm8G8

I don't have the TCC wired to ground yet. I also do not have the force motor/ PCS wired to to 12v or ground. Could this be the culprit? Or is it something else?

[YoungPup1977]

"SHE" is showing you who is the boss...maybe go with "HE".....start there first...

[85raiderburban]

Is that supposed to be a joke?

[85raiderburban]

*UPDATE* Got her to shift finally. Checked a few connections and found the 12v wire to be dead. Nuthin comin from it. Also had a bad ground on the PCS/force motor. So decided to reroute the pin E to the 12v junction block. All is good now.

[clinebarger]

You need to get your line pressure under control before you break something!!!! Your also restricting Converter/Cooler/Lube flow & putting unnecessary strain on the Pump with no EPC control......Running power & ground to it is NOT a solution!

Converting to a Vacuum Modulator is the best solution if you really want to keep rocker switch control.

Trans Go part# 48-MOD, Transtar/WIT part# A34431E, Cost about $150.

[85raiderburban]

Originally Posted by clinebarger

You need to get your line pressure under control before you break something!!!! Your also restricting Converter/Cooler/Lube flow & putting unnecessary strain on the Pump with no EPC control......Running power & ground to it is NOT a solution!

Im well aware of that. Im building a pontentiometer to wire into the PCS/force motor. With the turn of a dial i can drop pressure to any denominator. Part is only $30.

Originally Posted by clinebarger

Converting to a Vacuum Modulator is the best solution if you really want to keep rocker switch control.

Trans Go part# 48-MOD, Transtar/WIT part# A34431E, Cost about $150.

Would be awesome for to have that. i dont like the idea of having rubber hose submerged in hot trans oil and having to drill the case. It SHOULD come with a steel line that juts up and comes out of the dipstick. Thats how i would do it. But that part is out of my budget so kudos to who goes with it.


This is not mine. But will be similar.

[85raiderburban]

Originally Posted by clinebarger

You need to get your line pressure under control before you break something!!!! Your also restricting Converter/Cooler/Lube flow & putting unnecessary strain on the Pump with no EPC control......Running power & ground to it is NOT a solution!

Converting to a Vacuum Modulator is the best solution if you really want to keep rocker switch control.

Trans Go part# 48-MOD, Transtar/WIT part# A34431E, Cost about $150.

welp, the potentiometer thing was cheaper than i thought. But in the end it was a pain to have to keep dialing in and out to drop or raise,all the while shifting with toggle switches. I might make my own mechanism similar to a TV cable for line pressure control via the potent but that will be for the future when i have time on my hands. For now tho, got lucky and found a vacuum modulator on Ebay for $90. Instead of drilling the case i decided to use metal line and punch a hole out the dipstick tube to run rubber hose up to the intake.