Suddenly today my TW Magna 4 Speed Auto 3.5L takes a few seconds to change gear from Drive to Reverse. Same problem changing from Reverse to Drive.

I have recently noticed a shudder in 4th gear between 65 and 80km/h under light acceleration which may or may not be related. I initially thought it was ignition issue, but wondering now if it is tranny issue.

Only 90,000 km on the Odometer.

Any ideas/suggestions on what the cause might be?

Ever changed the oil?

Only bought the car 5,000km ago.
The tranny fluid is dark brown.
I'll try a fluid change.

Only bought the car 5,000km ago.
The tranny fluid is dark brown.
I'll try a fluid change.
Should be a nice pink/red colour.
Brown sounds like it's stuffed