Sonnax for the line pressure modulator valve www.sonnax.com part no. 96948-01k and for the accumulator springs go to www.transtechtool.com/tric.html . This is pretty much is the shift kits the Ford-Diesel guys have been using. And this is what I use in my truck it costs around 50 bucks for everything the springs and valve. It firms up the shift and made the trans in my other truck last countless dyno pulls and 1/4 mile passes 404HP and 825TQ on the dyno and 14.19 @ 98 MPH in the 1/4 mile. And the trans was replaced with a fresh unit with a aftermarket converter and transgo shift kit and I never should have touched it!

Greg

 

With my modest mods (listed below) I can lay a patch of rubber the lenght of the truck in second gear. I couldn't even get a little bark without them. Big Big difference! I don't have the Bassani or Donzi plugs installed yet either.