Firebird V8-350 5.7L (1987)
vTighten v^Nut to 2.3 N-m (20 lb. in.). ^Rotate J 23597-11 or J 21777-29 to seat the bearings. ^Mount J 8001 on J 23597-1 or J 21777-1 and preload indi
4.
J 21777-45 on J 23597-1 or J 21777-1 and position unit in carrier.
5.
Side bearing caps and bearing cap bolts.
vTighten ^Bearing cap bolts to 75 N-m (55 lb. ft.).
vMeasure ^Pinion depth. ^Rotate J 23597-1 or J 21777-1 slowly back and forth until J 8001 reads the greatest deflection (the point where the needle
changes direction). At that point, set J 8001 to zero. Repeat rock action to verify the zero setting. ^After zero setting is obtained, rotate J 23597-1 or
J21777-1 just until the plunger no longer touches J 23597-11 or J 21777-29. This provides the gaging reference of a "nominal" or "zero" pinion. ^Record
J 8001 reading at pointer position. This indicates the proper shim to use
Example:
if pointer moved counterclockwise 1.70 mm (0.067 inch) to a dial reading of 0.84 mm (0.033 inch), this indicates a shim thickness of 0.84
mm (0.033 inch) (Figure 2). ^On 7-1/2-inch and 7-5/8-inch ring gear axle assemblies (Type K), select the correct drive pinion shim to be
used during reassembly on the following basis:
-No marking on drive pinion, correct shim has thickness EQUAL to J 8001 reading. -Plus (+) marking on drive pinion, shim thickness indicated by J
8001 INCREASES by the amount on the drive pinion. -Minus (-) on drive pinion, shim thickness indicated by J 8001 DECREASES by the amount on
the drive pinion.
^On 8-1/2-inch ring gear axle assemblies (Type G) drive pinions are nominal gears and do not have markings. Required shim thickness is EQUAL to J
8001 reading. ^Shims are available in 0.03 mm to 0.94 mm (0.001 inch to 0.037 inch). Shim thickness is etched on the flat surface for easy identification.
vRemove or Disconnect
^
Loosen J 21777-43 and remove special tools and both bearings from carrier.
vInstall or Connect
1.
Correct shim on drive pinion.
2.
Drive pinion rear bearing (7).
vAssemble
^Differential case. Refer to "Differential Case Removal with Axle Shafts Removed," in the appropriate service manual.
vMeasure ^Preload of the total assembly at the pinion yoke nut. With new bearings, preload is 4.0 to 4.5 N-m (35 to 40 lb. in.) rotating torque with a new
seal. With used bearings, preload is 2.3 to 2.8 N-m (20 to 25 lb. in.) rotating torque with a new seal.