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In rear-wheel drive automobiles the central drive shaft (or prop shaft) engages the differential through a hypoid gear(ring and pinion). The ring gear is mounted on the carrier of the planetary chain that forms the differential. This hypoid gear is a bevel gear that changes the direction of the drive rotation.
In a 1997 Ford Aerostar (REAR differential) With the 7.5  ring gear (3.5 U.S. pints) With the 8.8  ring gear (5.0) * traction lok, add 4 ounces of friction modifier. The rear differential fluid goes directly in to the rear differential. There is normally an inset plug that has a square drive on it that accepts a 3/8 rachet or rachet â¦ extension. Remove this plug. If fluid comes out, you do not need to add any.