No reverse, slow, or slipping are worn-out issues. Fluid leaks in the reverse apply circuit are also a common problem with such transmissions. If you notice that 1-2 shifts don’t happen until you let off the gas, visit the mechanic. You will also see other signs. The best way is to replace it with a new or used 4L60E transmission for sale. For such transmissions, search for the top auto recyclers. They check each part thoroughly before delivery and give Grade A to each transmission.