dan woodland
+1y
When the auto shifts correctly you shouldn't notice - if it's not up-shifting correctly it's that hose or modulator. If you see any trans leak you need to check the filler tube seal, modulator seal, and all the other seals (lock up solenoid, pressure switch etc).
The lock up solenoid is controlled by a electronic trans pressure switch on the driverside of the trans - the last portion I posted on the trans. The seal around the signal wire goes bad...