Why my transmission wants to down shift

Sounds like it needs to go back to the shop that rebuilt the transmission.

Take it back the the transmission shop, it needs to be further diagnosed and probably rebuilt.

Change the fluid and filter first. If that has no change for the better, then the tranny may need to be rebuilt.

That could be a perfect reason to take it back to the shop where it was just repaired for repeat service. Either that or you spun out in the mud.

Believe it or not, but the throttle position sensor as alot to do with the shifting. Also the range position sensor known as the neutral safety switch.

Check you transmission fluid for proper levels. If ok, have the transmission oil and filter changed!! If that doesnt remedy the issue, its possible the transmission needs to be replaced or rebuilt!!

Most rebuilt transmissions are guaranteed for 1 year. Take it back to the shop that rebuilt it.

sounds like trans has gone bad, last service of filter and fluid? clogged screen or low/burnt fluid would effest but if clunking sounds like trans is shot

20 year old vacuum hoses are done. Replace all you can. The little plastic ones too. They control everything, transmission, computer, fuel, brakes, everything.

the transmission is loseing internal fluid pressure, its time for a rebuilt transmission. The A4ld that your explorer has is prone to trouble in this area. A good rebuilt transmission may cost at least $1700 dollars.