self installed 4l80e hd2 shift kit help please!
05-07-2009, 06:33 AM
#11
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Drilling the drain back hole out to 5/16 of an inch is to prevent fluid pressure building up between the seal and the pump and shoving the seal out. Apparently its an issue, especially when they get a few miles on them and the pump bushing isn't what it used to be. The other mod, I believe it was to the TCC circuit I'm assuming puts direct line pressure to it or something along those lines. TC lockup even with a stock converter feels like a firm up shift. Those holes are kind of hard to drill going sideways into cast iron though.
05-07-2009, 02:48 PM
#14
I did not have that page in my instructions but wish I would have had it during my recent build so I could have done the pump mods. Oh well....
Only for about 3000 miles till my converter clutch came apart and clogged up the system. I recently R&R'ed the tranny and installed the direct springs and thicker intermediate snap ring then.
how long did you run it with out the springs and thicker snap ring?
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