I have a late 99 silverado 4x4 4L60-E ec3 in the shop (fresh rebuild)that when in 2nd gear the 3/4 clutches seem to be applied. 1st gear is ok, rev is ok,3rd and 4th are ok. solinoids are functioning corretly. I used a Z-pack 3/4 clutch set. original problem w... Login to read more.