Since it is so high mileage I think I would just pull the pan and change the 4-6 quarts that are in the pan and replace the filter. If you go to a place that flushes transmissions, I have known that with the new fluid the lining comes off of the fiber plates.
. use atf+4 from Chrysler dealer or it destroys the clutches.
You have to remove the transmission pan to drain the fluid. Change the filter(s). Reinstall the pan and fill the fluid.
Check level of transmission fluid Change transmission fluid and filter
Automatic transmission fluid.Automatic transmission fluid.
Check the fluid.
Automatic transmission fluid
A 2000 Jeep Grand Cherokee uses ATF+4.
The code p1762 in a Grand Cherokee shows possible transmission problems. Low transmission fluid could be the cause. Make sure that the fluid is full then check again.
Same place you check the fluid level.
There isn't one. You have to remove the pan to drain the transmission fluid.