2H is Rear wheel only with High Ratios. Best for Roads.
4H is 4WD with 33% torque front and 66% torque rear. Open Transfer case differential. High Ratios
It essentially powers all wheels but one wheel of the ground the rest three lose power. Best used on Dirt tracks.
4HLc is 4WD with 50% torque front and 50% torque rear. Locked Transfer case differential. High Ratios
Best for Muddy and Rough tracks.
4LLc is 4WD with 50% torque front and 50% torque rear. Locked Transfer case differential with LOW RATIOS.
Best for steep off road climbs and rock climbing and hardcore offroading.