Wow ! Blast from the past. I ran this set-up till I sold my 4Runner last summer.
Never had a problem with it. Would advise it to you as a good set-up.
Go for it dude.
Peace,
Yota Buck
Here are a couple of sizes that are bigger---
30x9.5x15 or 265/70/15 or 31x10.5x15
Any of those sizes are pretty easy to find and would work nicely on your 89.
Walmart is always a good place to check and Pepboys too.
Good Luck,
Yota Buck
It should not be any problems if you lower the front and leave the rear high. You may have to adjust your headlights.
A local shop lowered my front for $60 and that included a front end alignment.
Good luck,
Yota Buck
I "uncranked" my torsion bars. The P.O. had them jacked up about 2". All I can say is it drives a lot better now, and it does'nt beat me up as much. Your cv shafts should last longer too.
The rear sits level now with the Moog Coils and Air Shocks when towing.
Peace,
Yota Buck
Vinny,
I am assuming you are doing all 4 shocks.
It is easy to do. The new shocks should have all the hardware and bushings to replace the old OEM stuff.
Will your upfront put a couple of zerk fittings into the ball-joints.
Good luck.
Peace,
Yota Buck