Buy Caterpillar 4V6749 - LOCK-NUT at wholesale prices with easy payment and fast shipping options. Save up to 50% OFF OEM pricing. Compatible Machines:- ENGINE - MACHINE- WHEEL-TYPE LOADER Compatible Models:- 3406- 3406B- 3406C- 980C Units Containing The Spare Part :- 3V3857 FRONT DIFFERENTIAL & BEVEL GEAR GROUP (3406)- 3V3857 FRONT DIFFERENTIAL & BEVEL GEAR GROUP (3406)- 3V3858 REAR DIFFERENTIAL & BEVEL GEAR GROUP (3406)- 4V1073 FRONT DIFFERENTIAL & BEVEL GEAR GROUP (3406)- 3V4030 REAR DIFFERENTIAL & BEVEL GEAR GROUP (3406)- 3V-3857 DIFFERENTIAL & BEVEL GEAR GP -FRONT (3406)- 3V-3858 DIFFERENTIAL & BEVEL GEAR GP -REAR (3406)- REAR AXLE DIFFERENTIAL AND CARRIER GROUP (D35C)- FRONT DIFFERENTIAL AND BEVEL GROUP (D44B)- REAR DIFFERENTIAL AND BEVEL GROUP (D44B)- CENTRE AXLE DIFFERENTIAL AND BEVEL GROUP (D550B)- REAR AXLE DIFFERENTIAL AND BEVEL GROUP (D550B)