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4L60E Transmission Rebuild Page 15 of 33

 
Figure 50
Figure 50
Figure 51
Figure 51

Figure 50. The forward sprag assembly was also heavily worn, just like the input drum. It is unusable and must be replaced.

Figure 51. Pictured is the new Heavy Duty Forward Sprag assembly. It can only be purchased as an assembled unit. It is pricey, but it comes with a new one way sprag bearing already in it.

Figure 52
Figure 52

This is the assembled and finished input drum assembly. This thing was a major headache. When it was rebuilt the first time, every part except the forward clutch housing was replaced. That was a mistake. When it was tested, one piston would not close, and the cause turned out to be the small check valve in the forward housing was stuck open. A new housing was acquired from Monster Transmission and the drum was built again. It worked that time.

Sadly, pictures of the drum assembly were not taken, but will be detailed in this page. The first part is to install on the inner shaft the o-ring. The next part to install is the 3-4 apply pistion. lube the bore, input drum inner shaft, and the seals on the apply piston and use a .010 feeler gauge to roll the seals in then push the piston in.

The 3-4 clutch apply plate with the 5 fingers goes in next, then the larger diameter spring cage. Install the forward clutch piston in the forward clutch housing, again using the .010 feeler gauge to roll the seal edges in without damaging them. Insall the forward clutch housing/piston in the input drum, again using the feeler gauge to carefully roll the seal edges in. Install the second spring cage and retaining snap ring. The bottom half of the input drum is now finished.


 
 
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