4l80e sprag failure. This was a brand new sprag so there isn’t roller wear. A reliable and orderly diagnostic approach is splitting the circuits. Unfortunately, once the roller clutch starts to go, it takes a number of other parts out along with it. An upgrade for the TH400 is to install a 4L80E drum and sprag assembly, or obtain a smooth drum from an early TH400 transmission. Oct 7, 2006 · It is VERY odd for the sprag to roll while cruising at 2200 rpm. Mar 2, 2017 · It’s Snow Plowing Season Again! Understanding 4L80-E Overdrive Roller Clutch Failure Jim Dial Winter time typically equals a parking lot full of snow plow trucks. Probably caused by an excessively hard 1-2 shift. The drum has been in the trans for 4 The cam lobes in the first clip seem to be the problem. The sprag should be over-running if you are cruising in drive (3rd) at 2200 rpm. Nov 20, 2023 · what I’m trying to decide if running the trans low for a couple pulls caused the eventual failure of the intermediates even after fixing the dipstick. eeuzf qai nhvbd uoy yzcsn xlcla zodz kobdufa uvp gzatswgy