The rear of your 4runner has springs. There was a recall for 4runners that involved the rear end sag.
Build Years/Makes/Models: 1996 - 1998 TOYOTA 4 RUNNER
UNits affected: 273743
Recall Number: 02V021000
Summary: ON CERTAIN 2-WHEEL-DRIVE (2WD) AND 4-WHEEL-DRIVE (4WD) 4RUNNER SPORT UTILITY VEHICLES, A COMBINATION OF HEAVY LOADING (SIMULTANEOUS LOADING TO REAR GROSS AXLE WEIGHT RATING AND GROSS VEHICLE WEIGHT RATING) AND SEVERE STEERING MANEUVERS COULD CAUSE THE 2WD 4RUNNER TO LOSE DIRECTIONAL STABILITY.
Consequence: THIS MAY RESULT IN A LOSS OF CONTROL AND COULD INCREASE THE RISK OF A CRASH.
Remedy: DEALERS WILL REPLACE REAR SUSPENSION PARTS. ALTHOUGH THE 4WD 4RUNNERS DO NOT EXHIBIT THE HANDLING CONDITION, TOYOTA WILL RECALL THESE VEHICLES TO AVOID ANY PUBLIC CONFUSION AS TO WHICH VEHICLES SHOULD RECEIVE THE REPLACEMENT PARTS. OWNER NOTIFICATION BEGAN FEBRUARY 28, 2002. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT TOYOTA AT 1-800-331-4331.
Notes: TOYOTA RECALL NO. SSC 20A.ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).