Yeah I have 3.21, 35s with a Procal and highway is still painful. I run the TGs at 28 PSI cold which measured around 34 from ground to top but after I got home this afternoon from a highway drive they were split between 34 and 34.25 (31 PSI) so I bumped the Procal accordingly. The shift points were "stuck" in 3rd in the 70-75 range so I did a lot of manual shifting between 3rd and 4th, OD was out of the question. I have another highway trip in the AM that should test the new setting, but worse case it's a re-gear in the fall after vacation to 4.10 or 4.56. I may even give AEV a call since it doesn't seem to be the norm for what I am experiencing and have had other oddities.