Dana Spicer 18
Manufacturer: Dana-Spicer
Number of speeds: Two
High: 1:1
Low: 1.97:1 or 2.46:1
Case (or housing) material: Cast iron
Front output drive type: Gear (driver side drop)
Availability or aftermarket parts and support: High – Saturn overdrive, Novak Intermediate Shaft Kit, Tera Low 3.15:1 kit
Input spline count: 6 or 10
Rear yoke: Fixed (Jeep version had drum parking brake)
Planetary gear: No
PTO output: Yes
Available U-joint sizes for yokes: 1310
Output shaft spline count: 26
Shifter type: Mechanical
Weight: ~80 pounds
Length: ~8.5 inches (mount face-to-flange face)
Commonly found in: ’71-and-earlier Jeep, Willys vehicles, Ford GPW, IH Scouts
Dana Spicer 20
Manufacturer: Dana-Spicer
Number of speeds: Two
High: 1:1
Low: 2.03:1 or 2.34:1 or 2.46:1
Case (or housing) material: Cast iron
Front output drive type: Gear (driver side drop)
Availability or aftermarket parts and support: High – Tera Low 3.15:1 low-range, twin stick with old Dana 18 or aftermarket parts, 32-spline Advance Adapters rear output
Input spline count: 6 or 10
Rear yoke: Fixed
Planetary gear: No
PTO output: Yes
Available U-joint sizes for yokes: 1310
Output shaft spline count: 10 or 26
Shifter type: Mechanical
Weight: ~80 pounds
Length: ~10.5 inches (mount face-to-yoke center)
Commonly found in: ’72-to-’79 CJs, ’67-to-’73 Jeepsters, ’63-to-’70 Wagoneer/Gladiator/J-Trucks (and ’71-to-’79 with manual transmissions), ’66-to-’77 Ford Broncos, ’65-to-’79 IH Scouts (known as TC-145), some GM 1/2 ton trucks and Blazers/Jimmys
Dana Spicer 300
Manufacturer: Dana-Spicer
Number of speeds: Two
High: 1:1
Low: 2.62:1
Case (or housing) material: Cast iron
Front output drive type: Gear (driver side drop)
Availability or aftermarket parts and support: High – Twin stick setup, JB Conversions Lo-Max 4.0:1 low-range for the increase in strength where needed, and heavy-duty 32-spline front and rear outputs
Input spline count: 23
Rear yoke: Fixed
Planetary gear: No
Available U-joint sizes for yokes: 1310
Output shaft spline count: 26
Shifter type: Mechanical
Weight: ~86 pounds
Length: ~10.5 inches or 11.625 inches (mount face-to-yoke center)
Commonly found in: ’80-to-’86 Jeep CJs, 1980 IH Scout