There was a switch, in I think '99. The later models have an explosive squibb for the pre-tensioner so be sure you disconnect the battery for at least 90 seconds before you mess with one like that.
I have this link, but I think it is for the squib-less years and I have not tried it:
Minute Mod- Fixing Seatbelt Retractors
I have done the same thing successfully on a BMW e23(735i)
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'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap