Rear Drive Axle: Specifications — Cadillac STS I (2004-2007)

Rear Drive Axle: Specifications Cadillac STS I

Fastener Tightening Specifications

Application	Specification
Application	Metric	English
Differential Housing Cover Bolts	29 N.m	21 lb ft
Differential Ring Gear Bolts	185 N.m	136 lb ft
Differential Support Mounting Bolts	175 N.m	129 lb ft
Drain Plug	39 N.m	29 lb ft
Fill Plug	39 N.m	29 lb ft
Pinion Cage Bolts	29 N.m	21 lb ft
Pinion Nut	265 N.m	195 lb ft
Propeller Shaft Coupler-to-Differential Flange Bolts	85 N.m	63 lb ft

Fastener Tightening Specifications

Application	Specification
Application	Metric	English
Differential Case Shim Sizes	3.5-4.4 mm	.14-.17 in
Pinion Housing Shim Sizes	1.2-1.9 mm	.04-.07 in
Pinion Rotating Torque w/seals	2.5-4 N.m	22-35 lb in
Ring Gear/Pinion A1 Nominal Value-All Axles	111.00 mm	4.37 in
Ring Gear/Pinion A2 Nominal Value-3.42 Ratio Axles	63.5 mm	2.50 in
Ring Gear/Pinion A2 Nominal Value-3.73 Ratio Axle	63.5 mm	2.50 in
Ring Gear/Pinion A2 Nominal Value-3.91 Ratio Axle	63.5 mm	2.50 in
Torsional Backlash
3.42 Ratio with 96 mm Flange	0.22-0.35 mm	.009-.014 in
3.23 Ratio with 96 mm Flange	0.21-0.34 mm	.008-.013 in
3.91 Ratio with 96 mm Flange	0.25-0.41 mm	.010-.016 in
2.73 Ratio with 105 mm Flange	0.20-0.31 mm	.007-.012 in
3.23 Ratio with 105 mm Flange	0.23-0.37 mm	.009-.014 in
3.42 Ratio with 105 mm Flange	0.24-0.38 mm	.009-.015 in
3.73 Ratio with 86 mm Round Flange	0.21-0.34 mm	.008-.013 in

Rear Axle Specifications

Scheme 1: Rear Axle Usage

Available Axle Ratios

Calculations	Example Measurements		Actual Measurements
	Metric	English	Metric	English
B Nominal Value	5.00 mm	0.197 in	5.00 mm	0.197 in
B1 Measured Value	3.31 mm	0.130 in
B2 (B Nominal Value Minus B1 = B2)	1.69 mm	0.067 in
A1 Value (Taken from Ring Gear)	111.03 mm	4.371 in
A Nominal Value	111.00 mm	4.37 in	111.00 mm	4.37 in
B3 (A1 Value Minus A Nominal = B3)	0.03 mm	0.0012 in
B2	1.69 mm	0.0665 in
B3	0.03 mm	0.0012 in
Pinion Shim Size (B2 Plus B3 = Pinion Shim)	1.72 mm	0.0677 in

Pinion Shim Calculation Table with an A1 Value Greater Than 111.00 mm (4.37 in)

Calculations	Example Measurements		Actual Measurements
	Metric	English	Metric	English
B Nominal Value	5.00 mm	0.197 in	5.00 mm	0.197 in
B1 Measured Value	3.31 mm	0.130 in
B2 (B Nominal Value Minus B1 = B2)	1.69 mm	0.067 in
A1 Value (Taken from Ring Gear)	110.97 mm	4.369 in
A Nominal Value	111.00 mm	4.37 in	111.00 mm	4.37 in
B3 (A1 Value Minus A Nominal = B3)	0.03 mm	0.0011 in
B2	1.69 mm	0.067 in
B3	0.03 mm	0.0011 in
Pinion Shim Size (B2 Plus B3 = Pinion Shim)	1.66 mm	0.0654 in

Pinion Shim Calculation Table with an A1 Value Less Than 111.00 mm (4.37 in)

Calculations	Example Measurements		Actual Measurements
	Metric	English	Metric	English
C Nominal Value	5.00 mm	0.197 in	5.00 mm	0.197 in
C1 Measured Value	3.10 mm	0.122 in
C2 (C Nominal Value Minus C1 = C2)	1.90 mm	0.075 in
A2 Value (Taken from Ring Gear)	63.53 mm	2.501 in
D Nominal Value	63.50 mm	2.5 in	63.5 mm	2.5 in
C3 (A2 Value Minus D Nominal = C3)	0.03 mm	0.0012 in
C2	1.90 mm	0.0748 in
C3	0.03 mm	0.0012 in
Left Side Case Shim (C2 Plus C3 = Left Side Shim)	1.93 mm	0.0736 in

Differential Case Left Side Shim Calculation Table with an A2 Value Greater Than 63.5 mm (2.5 in)

Calculations	Example Measurements		Actual Measurements
	Metric	English	Metric	English
C Nominal Value	5.00 mm	0.197 in	5.00 mm	0.197 in
C1 Measured Value	3.10 mm	0.122 in
C2 (C Nominal Value Minus C1 = C2)	1.90 mm	0.75 in
A2 Value (Taken from Ring Gear)	63.47 mm	2.499 in
D Nominal Value	63.5 mm	2.5 in	63.5 mm	2.50 in
C3 (A2 Value Minus D Nominal = C3)	0.03 mm	0.0012 in
C2	1.90 mm	0.0748 in
C3	0.03 mm	.0012 in
Left Side Case Shim (C2 Plus C3 = Left Side Shim)	1.87 mm	0.0736 in

Differential Case Left Side Shim Calculation Table with an A2 Value Less Than 63.5 mm (2.5 in)

Application	Quantity
Application	Metric	English
Differential Lubricant GL 75W90 G/M P/N United States 12378261, GM P/N Canada 10953455	1.3L	1.37 qt

Capacities