meonemexican

My 3rd gen 97 4Runner is suffering of rear sag.
After searching around I think I want to get some trekmasters as well as 99 tall springs. I don't do much offroading so my main concern is street and highway driving.

Do I have to replace all 4 springs or if I can just get away with replacing the rear ones for the 99 tall springs and keeping the 97 front springs?

In an ideal world I would like o replace all 4 springs but I am tight on money and would love to save a couple of hundred bucks.

However I am worried that the back being higher than the front might cause some uneven tire wear.

If someone has done this I would appreciate any insights you might provide.

Thanks