Originally Posted by Jeffrey
I needed to add a quart to get the level to the hash marks on the dipstick. How it got that low I'll never know.
It could be several things, have you checked it periodically yourself in the past? How long/miles ago did you check?
Typically the transmission doesn't lose fluid unless there's a leak somewhere. Check all around the drive train underneath your van. If its really 1 quart low there should be drops on the ground or a "spray" on or near the transmission.
Also be sure to check your coolant making sure there's no evidence of trans fluid there. (If there is you have a leak inside the radiator.)
FWIW when I did the DIY full fluid flush I thought it was filled correctly. Within 20 miles of driving at highway speeds the OD light was flashing, the deciphered "code" was overheating, a possible cause low fluid---it was just about 1.5 qts low.
Sounds like you've got it all under control---good to keep up on maintenance items like this.