Hi guys.
I swapped in the 80E in my 2000 silvo 5.3 and LOVE IT. It shifts much better than the 60 did and the truck even accelerates better despite the higher first gear ratio. It took quite a few parts, time, and hassle, but it was worth every penny. I will not hesitate to use another 80E in my '66 nova when the time comes. The 60e that i had in my truck lost both front and rear planets (once each at different times) and i was not about to go through the hassle of rebuilding that pile of a 4L60E again. Allen (farmtruc) was great in getting the pcm programming to work and I would recommend him to anyone.