Figure 46. Now we come to the heart of the 4L60E, the input drum. The old drum out of the transmission is heavily worn and not re-usable. This is going to have be replaced.
Figure 47. This is the new Sonnax Smart Tech Input Drum. If your going to replace the drum, you might as well do it right and get the best, as this is where the most problems with the 4L60E are. This drum allows you to put extra 3-4 clutches in, and has other features that help with common failure points in the transmission.
Figure 48. The input shaft was also worn out, and replaced with the Sonnax 300mm non-reluctor hardened input shaft. the shaft and drum get a dose of sleeve retainer compound, to make sure it does not come out and helps seal it in the drum. The shaft is then pressed into the drum.
Figure 49. A major flub happend here when pressing the new shaft in. The inside hub support uner the bottom of the drum was not centered, and when the shaft bottomed out, it slipped and cracked the drum. There was no way to fix it, and a second drum had to be purchased. The support problem was remedied by purchasing two 3 inch round bars 3 inches long from McMaster-Carr to use as press blocks, and they were set under it for support while pressing the shaft in. Once the shaft is in, then the reinforcement sleeve can be installed in the drum and then it is ready for final assembly.
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