i got a 96 4x4 and my tranny wants to in 3 lockup and 4th lock up just all of the sudden just loses its gear then i let off the throttle and then i will work fine. when it is in it holds fine up hill and seems to loose it when i am going down hill. this started while driving. i got i plugged into the modius scan tool and my temp is reading -83 when warmed up i have another gauge and the governor pressure is show to be very ertaric. the tps tests fine on the scane tool makes a nice arc on the graph. anythoughts on what to check or replace? it is only showing a speed sensor code. thanks Trevor

 

no one knows or had this problem???

 

it seems to be a one way clutch in the tranny itself