What to do if you put a 4L60 transmission in a new car? When it comes to troubleshooting the 4L60E, you have to keep in mind that the automatic transmission (4L60-E) in your rear wheel drive GM vehicle will usually experience failure in one of two ways: Internal mechanical failure will be the cause of transmission ‘slippage’. What causes transmission slippage on a GM 4L60E? Transmission must be removed and rebuilt. Overrun clutches will be worn out after 30 seconds of this behavior. Horrible noise in 4th and feels like the brakes are on: overrun clutches are applying due to a cracked or leaking forward piston. Not a critical failure, but not a good sign either.
Trans seems noisy when moving in 1st and Reverse, noise goes away instantly if you shift to N or the transmission goes into 3rd gear: Reaction planetary is worn out due to high miles or insufficient lubrication. So, what causes the no 3rd gear or 4th gear problem? Why is my Trans bad on my 4L60E? This leaves you driving around a car or truck that screams down the road. One of the most common (and most frustrating) problems that happens to the 4L60E is when it loses 3rd and 4th gear at the same time. The Late 4L60-E was released in 1997 in and fully phased into wide use through GM by 1998 in both RWD car platforms (including the C6 Corvette) and trucks in both 2wd and 4wd configurations. The 4L60-E is the “E”lectronically shift controlled version of the 4L60.
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