99 F-550 Rear End Gears
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Here are the Dana/Spicer part numbers for the matched ring and pinion sets on the ratios requested:
3.91 Ratio Ring & Pinion Set: 360KG105-X
4.10 Ratio Ring & Pinion Set: 360KG106-X
An important HOWEVER:
Since both the 3.91 and the 4.10 ratios fall outside of the 4.88 - 5.38 range of ratios the stock differential case uses in both diesel and gas configurations, a different differential case will also be required to use the taller gears. (By "case" I do not mean the external housing, but the internal differential case, ring gear backing plate, and bolt group.)
The Dana/Spicer part number for the differential case group appropriate for the range of axle ratios from 3.91 to 4.44 is:
360KQ102-X
Here are the Dana/Spicer part numbers for the matched ring and pinion sets on the ratios requested:
3.91 Ratio Ring & Pinion Set: 360KG105-X
4.10 Ratio Ring & Pinion Set: 360KG106-X
An important HOWEVER:
Since both the 3.91 and the 4.10 ratios fall outside of the 4.88 - 5.38 range of ratios the stock differential case uses in both diesel and gas configurations, a different differential case will also be required to use the taller gears. (By "case" I do not mean the external housing, but the internal differential case, ring gear backing plate, and bolt group.)
The Dana/Spicer part number for the differential case group appropriate for the range of axle ratios from 3.91 to 4.44 is:
360KQ102-X
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