WHILE TRAVELING ON A SLIGHT GRADE AT APPROX 60 MPH VEHICLE DOWNSHIFTED THEN NOTED PLUME OF WHITE SMOKE EXITING FROM REAR I VEHICLE. UPON PULLING OVER A SMALL ENGINE COMPARTMENT FIRE WAS NOTED AN EASILY EXTINGUISHED. UPON FURTHER INSPECTION RIDE SIDE OF ENGINE COMPARTMENT WAS NOTES TO BE COVERED IN TRANSMISSION FLUID. THIS WAS RIGHT SIDE ONLY FURTHER INSPECTION REVEALED TRANSMISSION FLUID COMING FROM RIGHT SIDED TRANSMISSION BREATHER TUBE JUST BEHIND DIPSTICK ON RIGHT SIDE. CAUSE ON FLUID DISCHARGE APPEARS TO BE AN OVER HEATING OR PRESSURIZATION OF TRANSMISSION CASE AS THERE ARE NO OTHER PORTS OF EXIT. TRAMS CASE IS INTACT AND AREAS AROUND TRANSMISSION ARE DRY FREE OF DEBRIS OR EVIDENCE OF LEAKAGE. FLUID LEVEL PRIOR TO EVENT WAS CORRECT AND NO POSSIBILITY OF OVER FILLING AS FLUID LEVEL WAS INSPECTED ON REGULAR BASIS. CONTACT DEALER AND WAS ADVISED THERE IS NO POSSIBLE WAY TRANSMISSION FLUIDS ARE CAPABLE OF CAUSING FIRE. DEALER STATED ALSO NO POSSIBLE WAY FLUID COULD BE COMING FROM BREATHER TUBE. THEY DID OFFER A QUOTE FOR REPAIR OF $3800 TO $4000 TO REPAIR PROBLEM. THIS ALL WAS DONE WITHOUT OFFERING TO EVEN INSPECT THE VEHICLE. *TR