to check the ratio, you need to disconnect the prop shaft from the diff and pull out the two drive shafts. With some tipex, mark the prop flange and casing in one line. do the same with one of the driveshaft holes. you should find that you need to turn the propshaft flange roughly 3.5 times to get the driveshaft hole to turn once.
also, check your gearbox code and let us know here so we can confirm that it does require a 3.54 diff.
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