How do you know when the transmission is going out? on 1996 Acura RL

Driving one day about 70mph,the car slowed down to about 65.Then it speedup again to 70,then I heard this clonking noise from underneath car, pulled over and called a tow truck. Car will go into drive & reverse,but when driven around 35mph it makes that clonking noise underneath.

Asked by for the 1996 Acura RL
1 answer
That generation of transmission gave some trouble, If the transmission oil is discolored or smells burned it could be an early sign of trouble. A check Engine Light will come on for some a lot of transmission codes. Have it checked out by a transmission or Acura specialist.