Clutch dust and metal particles from normal wear
Most likely causes are low transmission fluid level, dirty transmission fluid, or clogged transmission fluid filter.
check transmission fluid for correct amount or being dirty if fluid is ok your transmission is wearing out
Low or dirty transmission fluid Transmission bands are worn
Your transmission doesn't have an 02 sensor. The o2 sensor monitors engine exhaust to control engine performance. But, dirty transmission fluid is a problem and should be changed before it cause a major and very expensive transmission failure.
dirty tranny fluid
it could be low on fluid or dirty filter or internal problems.
Could beLow transmission fluid level,Dirty transmission fluid,Bad shift solenoid(s),Transmission mechanical problems,Transmission hydraulic control circuit.Start with checking the fluid level then a fluid flush.
Your Transmission Fluid is very dirty. Change it and flush it first.
being low on fluid
It could be caused by low transmission fluid level, dirty transmission fluid, a faulty torque converter clutch solenoid valve, or an internal transmission mechanical problem. Try dropping the transmission pan and changing the transmission oil filter and transmission fluid.
Small layers of the clutches, seals, and bearings wear off with time.
The transmission on the 1994 Nissan Pathfinder may need to have a fluid flush. Dirty fluid will cause the gears to shift hard when transitioning from place to place.