Upgrading to a 3.88 to 1 Ring & Pinion can help reduce gas mil age & engine life by helping to reduce RPM's at cruising speed of todays traffic. Fits full Synchro Type 1 transmissions with keyed style forth gear & Rhino case. Requires either 014-409-135A (Swing Axle) or E98-5145-B (IRS)for installation
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