AMC Model 20 
Ring Gear Diameter:
Pinion Shaft Diameter:
Ring Gear Bolts:
Right Hand Threads:
Pinion Splines:
Cover Bolts:
 
8 7/8"
1.625"
8
7/16" x 20
28
12
Ratio
Teeth
Part #
3.54
39-11
AMC/354
3.73
41-11
AMC/373
4.10
41-10
AMC/410
4.56
41-9
AMC/456
4.88
37-8
AMC/488
 
Model
Year
Ambassador
68-74
AMX
68-79
CJ Series
76-86
Gremlin V8
70-76
Hornet
70-77
Hummer H-1
All
Javelin V8
68-74
J10, Wagoneer
80-86
Matador
72-78
Marlin
68-69
Pacer V8
78-79
Rambler, Rebel
68-69
Scrambler
76-86
Spirit V8
79
Installation Kits
Part #
Master Installation Kts
AMC/MOKIT
Installation Kits
AMC/KIT
Mini Installation Kits
AMC/MKIT
Pinion Bearing Set-Up Kit
PINSU1
 
     
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Toyota Ring and Pinion Gear Set
Ultralite Ring and Pinion Gear Sets
Precision Gear Differentials
Precison Gear Installation Kits
Precision Gear Bearing Set-Up Kits
Precision Gear Ultralite Series
The Precision Gear Story
Precision Gear Tech Help
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Tech Note:
When replacing a 2.73 with a 3.08 or numerically higher gear set, the case must be changed to a 3.08 and higher case.