Since it is an automatic, there is only one possibility: it is a ZF 4HP-22L. That means trans manufactured by ZF, 4-speed, 22-series, and the L stands for "lockup" referring to the locking torque converter that these units use.
I still owe you info about where transmissions might be found in California... look for a PM.
George
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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