Econoline E350 1 Ton V8-5.4L Prop SOHC VIN Z (1998)
the etched figures shown is known as the "button" end.
NOTE: Use the gear contact pattern method to make sure the final pinion position is valid.
1. Shim the drive pinion as follows:
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On the button end of each pinion, there is etched a plus (+), a minus (-) or a zero (0) number, which indicates the best running position for each
particular ring gear. This dimension is controlled by the shimming behind the inner pinion bearing cup (the back face).
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For example, if a pinion is etched m+8 (+3), this pinion requires 0.08 mm (0.003 inch) less drive pinion shims than a pinion etched " 0 " This
means by removing drive pinion shims, the mounting distance of the pinion is increased, which is what an m+8 (+3) indicates. Or if a pinion is
etched m-8 (-3), add 0.08 mm (0.003 inch) more shims than would be required if the pinion were etched "0". By adding 0.08 mm (0.003 inch)
pinion shims, the mounting distance of the pinion is decreased, which is what an m-8 (-3) indicates.
2. Measure the distance between the centerline of the ring gear to the back face of the drive pinion.
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The distance from the centerline of the ring gear to the back face of the pinion:
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127 mm (5.000 inches) for Model 60-1U
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136.5 mm (5.375 inches) for Model 70
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147.6 mm (5.812 inches) for Model 80
3. If the old ring gear and pinion is to be reused, measure the old pinion shims and build a new pack of shims to this same dimension. If a baffle is
used in the rear axle assembly, it is considered part of the shim pack.
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To change the pinion adjustment, pinion shims are available in thicknesses of 0.08, 0.13 and 0.25 mm (0.003, 0.005 and 0.010 inch).
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Measure each shim separately with a micrometer and add together to get the total shim pack thickness from the original buildup.
