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Chart A (28" is stock 4WD tire diameter)
From 28" to 33"=17.85% larger diameter
28" to 35"=25.00% " "
28" to 36"=28.57% " "
28" to 38"=35.71% " "
28" to 40"=42.85% " "
Chart B (Only gear choice available)
4.10 to 4.88 = 19.02% lower ratio
4.10 to 5.29 = 29.02% " "
4.10 to 5.71 = 39.29% " "
By installing 5.71's you are gearing for at least 38" tires. Try to match up the percentage increase of tire diameter with the percentage decrease of gear ratio.
Another tip: 5.71's have been known to break much faster than 5.29's under stressfull off road conditions.
*Some 4Runners came with 31" tires stock & 4.56's if I'm not mistaken.
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