4T40-E Archives - Transmission Digest
It Is Never Wrong to Do Right

The vehicle was a 2006 Pontiac G6 with a 2.4-liter engine and a 4T40-E transaxle. The customer complained that it was shifting hard all the time. OK, let’s take a survey: How many of you have your hand up saying, “I want that job; bring it on?” My thoughts when I saw the repair order with that complaint were that it should be a fast fix and easy to troubleshoot. Oh, boy, was I wrong.

A Blast from the Past

Today, we have a similar problem with welds cracking in General Motors’ 4T40-E oil-feed-tube assembly (see Figure 1). Lube failure to the forward-clutch-support assembly, slipping or no reverse, loss of engine braking in manual low and slipping or no forward are all possible with weld failure of the oil-feed-tube assembly.