BillTheHiker
Senior Member
Just returned from a 6k miles cross country trip and got the porpoising effect on some sections of segmented, concrete on I-80 and other roads in the East. Mostly on older sections, but also on a new section in Iowa. I estimate it happened on a total of 200 miles out of about 5k of interstate highways, so will probably just slow down and live with it in the future. It has not happened driving roads near where I live so no way to easily test any modifications.
I have an FWC fleet on a 2008 Tacoma with 76k miles, V6, 4x4, TRD off road and E rated Cooper AT3 running 45 psi rear, 40 front, two additional leafs in rear springs, everything else original including the shocks.
Porpoising happens on all sorts of vehicles. Google for "highway porpoising" and you will find all sizes and brands of trucks, RVs, trailers etc. reporting this problem.
I think that fixing the problem is trial and error and there are so many components that could be added or replaced that a lot of money can get thrown at it and still not solve the issue. When my shocks give out I will replace with adjustable ones and monkey with those to see if it helps.
I have an FWC fleet on a 2008 Tacoma with 76k miles, V6, 4x4, TRD off road and E rated Cooper AT3 running 45 psi rear, 40 front, two additional leafs in rear springs, everything else original including the shocks.
Porpoising happens on all sorts of vehicles. Google for "highway porpoising" and you will find all sizes and brands of trucks, RVs, trailers etc. reporting this problem.
I think that fixing the problem is trial and error and there are so many components that could be added or replaced that a lot of money can get thrown at it and still not solve the issue. When my shocks give out I will replace with adjustable ones and monkey with those to see if it helps.