Two-Speed Transfer Case

BASE two-speed transfer case is outperforming its competitors considering optimized and modern shell design, modular gear set structure and lightness driven by aluminum housing.

Two-speed transfer case offers remote and direct mount for transmission families.

Thanks to modularity concept followed by BASE Engineering and Company’s flexible business model, different ratios can be provided in a basic housing.

Proven in harshest field conditions, BASE two-speed transfer case has been widely used in key vehicles of reputable vehicle manufacturers. (e.g. BMC, Katmerciler, InterArmored)

Product Name TKB-330/10 TKB-420/10 TKB-420/20 TKA-420/10 TKA-535/10
Drop Distance 330 mm 420 mm 420 mm 420 mm 535 mm
Gear Low Ratio 2.8:1 (standard)
2.28 (optional)		 1.054:1 0.936:1 0.936:1 1.159:1
Gear High Ratio 5.85:1 2.19:1 1.922:1 1.922:1 2.546:1
Speed Shifting &
Interaxle Differential Lock		 Pneumatically Actuated
Indicator Switches,
%50-%50
Torque Distribution,
Capable for
manual shifting to
neutral mode		 Pneumatically Actuated
Indicator Switches,
%50-%50
Torque Distribution		 Pneumatically Actuated
Indicator Switches,
%50-%50
Torque Distribution		 Pneumatically Actuated
Indicator Switches,
%50-%50
Torque Distribution		 Pneumatically Actuated
Indicator Switches,
%50-%50
Torque Distribution
Output Flanges Standard KV 120
ISO 8667		 Standard KV 150
ISO 8667		 Standard KV 150
KV 180, ISO 8667		 Standard KV 150
KV 180, ISO 8667		 Standard 8.5C
Input Flanges Direct Mount
on Allison 1000
Series Transmission		 Remote & Direct Mount
on Allison 3200SP
Series Transmission		 Remote & Direct Mount
on Allison 3200SP
Series Transmission		 Remote & Direct Mount
on Allison 3200SP
Series Transmission		 Remote & Direct Mount
on Allison 4000
Series Transmission
Parking Brake Double FSG 90
(Ø 260×12.7)		 Double FSG 90
(Ø 340×12.7)		 Optional
Double FSG 90
(Ø 340×12.7)		 Optional
Double FSG 90
(Ø 340×12.7)		 Double FSG 110
(Ø 340×12.7)