Where is the TCM located?

Transmission shifts 1-3 without moving except when it reaches 4th shift, I want to replace the TCM hoping that it is the problem, but Ican not find it near the battery or under the battery as other says. Please help me locate the TCM.
Another problem is the Starter, I inserted a Spacer/washer about 3mm thick because my starter gear alignment with the flywheel ring gear seems not right because just after starting the starter gear crashing with the ring gear I inspected the starter assembly but I found it good. This problem observed after replacing the crankshaft with the same specs.