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Any way I have 2 PSD a 01 F350 CC 4x4 and a 99 F250 XC 4x4. My 01 shifts nice and hard. My 99 kind of slides into gear almost like a little slipping especially under power. I have changed oil and filter in both, no burn't oil. The 01 has 145k and the 99 has 130k. I drive the 99 about 1500m a month mostly highway. Is there anything I can do to make this shift better without just pullin it out and rebuilding... Torque converter??? additives???
Don't do additives of any kind. You can install a valve body on the trans without dropping the trans. Do a search on VB and you will find all the info you will need. I personally will be doing the full trans-go tugger shift kit here soon.