4L80e fluid change

[Pinger]

Slightly easier way to achieve the full flush - assuming there's a drain plug or use of suction via dipstick tube.
Drain the pan via drain plug (I did mine with suction via dipstick tube), drop pan, replace filter etc and refit pan. Fill pan with same quantity of oil removed, disconnect cooler line and run engine until fresh fluid is seen (if oil ceases to flow, top-up via dipstick tube though I didn't have to). Reconnect cooler line and add the same quantity of oil as was removed at the cooler line.
The only difference to Schurkey's method is using the first added oil for the TC flush without having to chase it via the dipstick as there is enough (or should be) in the pan to enable the TC flush.

 

[stutaeng]

I added my redneck drain plug to the pan I removed. It's just a 1/2-13 bolt with a nut welded on the inside, using a nylon washer as a sealing ring.

Second one I've done this way...works great! Just use a 19mm or 3/4" socket/wrench.

 

[stutaeng]

I got another job before the year slips away! 99 NBS Silverado with 5.3/4L80e swap. Unknown history from the tranny. The guy I bought it said the unit came from a 06 Silverado HD.

This oil pan also doesn't have the drain plug, so swapped the pan from the previous post.