1990 toyota corolla center differential locked up

[firefighterT1]

just did i clutch job on a 1990 toyota corolla with center differential. before i did the clutch job i had a few problems with the differential. It would every once in a while just come on by itself and when i went to turn it off it would take a few minutes to disengage. i replaced the clutch and got the motor and transmission put back in, put everything back together and it is locked up and wont come out. wondering if anyone know what i should do or can get me as many diagrams as possible so i can try to troubleshoot this problem. if you have any suggestions email me at firefighterT1@yahoo.com. thanks brian

[Xenon]

Well! I'm assuming you're talking about the AWD 1990 Corolla! Cause when you said ceter differential in the title I was confused...

[firefighterT1]

it is an all trac. its not an all time awd it just has a center differential.