Impossible. The engine is an 8.2 liter (500) with a 450 transmission, the dipstick should be near the firewall. Those are huge transmissions and carry allot of oil in them, if there was no filler tube it would be leaking everywhere. The tube may not be visible at eye level, so look carefully around the transmission housing it should be there. If the car has cruise control there is a diaphragm that is bolted behind the engine block,the dipstick and filler tube could be behind it.
post back your findings.