Gday Everyone!

I Have A Toyota Caldina 1995 Model ST195, Engine 3S-GE, Transmission A540H-09B (Full Time 4WD). When I put the gear lever in "Drive" the car does not pick up in first and it moves very slowly (I think the vehicle moves in third gear.) The O/D (overdrive) light has come on and has flickered a couple of times aswell. As soon as I hit about 3000rpm, the car drives normally. Now this problem doesn't happen all the time but only in the last 2-3 days of driving it too work.

Has anyone ever had this problem with another vehicle or a Caldina at all?

What am I looking for to fix this issue?

Regards, nos4ag!