Transmission will not downshift on its own
Ok I need some help here badly.
First off let me start off by telling you what I have .
I have a 1999 Dodge Durango.
It is the 5.2l V8 Magnum with an auto tranny.
The truck has been well maintained and has only 108,000 miles on it.
The issue I am having is I drove the truck for 15 minutes down the road today and stopped to grab an ice coffee at the cumberland farms and left the engine running and the AC on while I ran into the store. Up till this point the truck was running perfectly normal. Now I went to pull out and the truck had no power and seemed to be stuck in too high a gear. ( almost like it never downshifted) So I manually switch down to D2 and it drove fine and then switched up at 2500 rpm's to overdrive ( D3) and carried on about my way.
When I got home I pulled up my driveway only to have the truck barely get up the driveway as it would not downshift on its own.
The truck will run fine if I upshift myself from D1to D2 then to D3 but I am not sure why.
Now info that might pertain to this issue....not sure but I want you to know everything about the tranny.
I had a leaky tranny pan gasket for about 5 months and just kept adding fluid to keep it going as I had no idea what was leaking but I had just had surgery on my foot to reconstruct it and was pretty much uncapable of getting under it so 2 weeks ago I finally power washed it ...saw the leak and replaced the tranny pan gasket and did a full fluid change and filter. Leak went away and it is full of fluid at warm idle in Nuetral as required at testing.
I had put Lucas into it a few times as I thought that may help the leak not knowing it was just loose pan bolts but as I said I had no way of getting under it to check.
It has driven for 2 plus weeks perfectly fine with no leaks but all of a sudden it stopped shifting down out of the clear blue. Maybe the drop down linkage? Or a switch or something. I am clueless as to what tranny it is even. I am guessing a 46Re or 44Re ???
I posted this up in the tranny section on the forum as well but I was hoping I could get your opinion.
Oh and it just threw a check engine light code on the way home tonight after I drove it for about 45minute , shifting it manually. Might have caused the code as I am no perfect shifter but not sure. I will need to find a code reader to read it but I was told a tranny issue won't trip a check engine light. Is that right?
some one has told me that after a tranny fluid and filter chanfge that the transmission needs to be reset or something ??? true?
any help would be greatly appreciated!!