Is the 4L80E transmission a good or bad transmission?
But while the 4L80E is a strong, heavy-duty transmission, during the first few years of production the 4L80E was not as durable as its design permitted due mainly to faulty parts. As such, most of the 1991-1992 454SS trucks came with 4L80E transmissions that had faulty parts from the factory.
What’s the problem with the 4L80-E no overdrive?
The most common problem facing the 4L80-E NO OVERDRIVE and how to deal with it. Not open for further replies. If the problem is electrical then chances are you can troubleshoot the problem yourself. The torque converter has a torque converter clutch. It is this clutch that provides the mechanical coupling from the engine to the transmission.
Why does my 4L80E not downshift to lower gear?
The problem with these are that the solenoid intake port has no screen, which means any debris floating around in the pan can get into the very small inlet hole and jam the solenoid open, forcing fluid flow, which prevents the plunger from sliding in the valve body and hence prevents a downshift to the next lower gear.
Why is the DTC on my 4L80E inoperative?
– The instrument cluster is inoperative. Possible DTC’s: P0720, P0753, P0758, P0785, P0787, P0973, P0976, P1860, P2761, P2764, and P2769 may be set depending on the vehicle. Cause: The most likely cause of this condition may be a loss of voltage to the transmission on circuit 1020.
Can a GMC 4L80E be used as a Transmission Control Module?
Some years ago I developed a method of converting a 4L80E to full manual any 4L80E transmission to full manual control, eliminating the need for a PCM. As already stated this is for the 4L80E GM transmission WITH THE A TPS INPUT in order to function correctly as a transmission control module.
When did the GMC 4L85 transmission come out?
The 4L85 transmission was introduced in 2002. Some of the differences included a 5-pinion output gearset and 5-pinion reaction gearset. Though not a transmission development change, in 2006 GM specified a new transmission fluid formulation and required its use (for warranty) in the 4L80 series.
Why is my 4L80E transmission not locking up?
Common 4L80E Problems. Torque Converter Not Locking Up: The torque converter on most modern automatic transmissions is made to lock up in order to allow for a physical connection between the engine and the rest of the drivetrain. This is achieved by placing a clutch in the torque converter that locks out the hydraulic torque multiplication
What kind of case does a GM 4L80E have?
Like the other GM automatics, the 4L80E featured a die-cast aluminum case. Unlike the later 4L60E transmission, the 4L80E did not feature a removable bellhousing, but an integrated bellhousing with only the Chevrolet 90 degree engine bolt pattern being available.