![]() If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you. If you want a conclusive diagnostic performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a transmission shift diagnostic and the responding certified mechanic will get this resolved for you. If you can’t repair it on the car, just rebuild it. The transmission you have is very common, parts are very readily available, and is easily rebuildable so you needn’t worry. Often, no 4th gear is accompanied by noise (due to hard parts failure) and/or 1st or 3rd won’t work either. The problem with the overdrive and no 4th gear is probably mechanical in nature but would require further diagnosis. The 30 overdrive will give a 30 to 40 increase in gas mileage on the road when. ![]() The 4L60E has a 3.06 ratio in first gear, which is 20 lower than most transmissions. NEW 29 ELEMENT HEAVY DUTY FORWARD INPUT SPRAG. It is also possible to have inadequate line pressure due to a leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or possibly leaky seals throughout the transmission. RECALIBRATED VALVE PLATE FOR SHIFT FIRMNESS. Due to its remarkability, it has cemented its position as a darling of the aftermarket for transmission building. The strength that 4I60e offers have made it remarkable for many consumers alike. If you see a big drop in pressure when the PCM commands 2nd gear, there is a leak. To date, the 4I60e four-speed transmission remains one of the most versatile and longest-lasting transmissions that General Motors (GM) has produced. You can test for this by using an external pressure gauge. A more serious cause of 1-2 shift failure on the 4L60E is a leak in the 2nd gear apply circuit (servo assembly or 1-2 accumulator). ![]() Most 4l60e transmission filters and kits (including pan gasket and filter seal) cost around 20 30. Test the sensor (there should be a smooth, linear electrical response over the range of motion) or substitute a known good unit. Transmission filters for the 4l60e are very inexpensive and simple. The 1-2 shift failure on the 4L60E is often due to a faulty throttle position sensor (TPS). Before the advent of the 4L60E transmission, car manufacturers had a bone of contention while striving to bring about a vehicle’s fuel economy. ![]()
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