I've had a 904 in my Duster for years that's worked great. A few years ago the valve body cracked and I replaced it along with doing some zero-buck shift mods thanks to some members here (everything else seemed fine when I pulled the pan). It really firmed up the shifts especially 1st-2nd and all was good until I moved to lower altitude and picked up a good bit of HP and torque thanks to the denser air (runs mid-12s now in the 1/4). Now the 2nd-3rd shift is relatively soft and slow if I'm really getting on it. I'm paranoid I'll roast the forward(?) clutch pack if I keep doing that so I let off a bit before shifting into 3rd. The fluid is still good, has a deep pan and big aux cooler. I want to pull the pan and take a look, if it's not full of trash I'm thinking of putting in a proper Transgo TF-2 shift kit and sending it, rather not pull the trans and do a rebuild as I don't have the space currently and want to save money for manual swap. Does it sound like I just don't have enough pressure for applying the 3rd gear clutch pack for its current power level or is it toast?? I have no other issues with how it runs.
