T-400 won't shift properly
Yesterday out of nowhere my TH400 started acting strange in gears 1-3. It shifts perfectly fine from park to reverse to neutral.
When I go from neutral to drive, it feels like it's barely going into gear and I have to rev it pretty high to get it to move. It drives, but feels like a huge loss in power.
It also won't shift from 1-2-3 gears correctly. Normally you can physically feel it "clunk" into gear, but now it feels as if it's barely going into gear.
The modulator valve has a good connection, the vacuum line is good, and it's full of fluid. Again, yesterday it was running perfectly fine and this happened out of nowhere when I was on the road cruising.
It's a pretty new TH400. Any ideas? I've tried using 2 diff full manifold vacuum sources to the modulator thinking maybe I didn't have adequate vacuum goin to it, but with no luck..
If I can't figure it out today, I might just take to to my trans guy tomorrow.