4L30-Es May Drive You Crazy – Part I
If any part of your sanity were ever in question, the 4L30 E transmission might be just the thing to put you over the edge. The most-common complaints concerning the 4L30 E usually have something to do with reverse. No reverse, little or no reverse, neutraling in reverse and partial TCC-lockup apply in reverse are only a few of the many problems.
Centerline 101
The axis or centerline of an engine is the imaginary line around which the rotating mass revolves. The torque converter also has a centerline. Torque-converter rebuilders will tell you how important it is to maintain this centerline and to keep all surfaces perpendicular to this line. Transmissions also have a centerline. Most technicians learn early on the importance of good bushings and good bushing surfaces. Good bushings and their mating surfaces help to maintain a proper centerline to prevent seal and sealing-ring leaks.
Intermittent No Voltage
When a vehicle has been in failsafe or limp mode, it is important to check for codes to see what has caused this condition. If multiple codes are present, check to see whether there is something in common with each one.
Check the Ratio
The wrong differential was installed when the accident repairs were made two years before. The problem never surfaced until the car was driven more than 30 miles at one time. Since this was a second car, it took two years for the problem to show up.
Dodge Ram Dilemma
A four-wheel-drive 1995 Dodge R1500 pickup was towed to a transmission shop, which performed the usual pre-checks, including checking codes, cooler flow, pressure, and function of the transfer case and both differentials. All preliminary checks pointed to the transmission as the problem, and its subsequent removal and inspection did verify a defective transmission. The transmission rebuild seemed to go routinely, and the transmission performed adequately on the road test.
Low Line Pressure in 4L80-E in Diesel-Powered Trucks
Low Line Pressure in 4L80-E in Diesel-Powered Trucks
TASC Force Tips
Author: Gregg Nader, Sonnax
