What is the towing capacity of 1999 gmc sierra 3500 crew cab 4 x 4?

Answer 1

The 3500 series dually with the 7.4L gas engine and a 4.10 ratio rear axle had a maximum factory tow rating of 10,500 Lbs. With the 4.55 rear axle ratio the rating increased to 12,000 Lbs. for the 4x4 and 12,500 for the 4x2.

Some non-dually 3500 series trucks came with the 5.7L engine. Their maximum tow rating was 8,500 Lbs. -- same as the 2500 series trucks. All diesel powered 3500 series trucks in '98 and '99 were tow rated at 8,500 Lbs. maximum.

The weak link for the 7.4L dually is said to be the OEM torque converter used in the 4L80E automatic overdrive transmission. With an aftermarket high performance towing specific torque converter and added Transmission Fluid cooling the 7.4L '98 and '99 GMC 3500 dual rear wheel trucks with a 4.55 rear end can easily tow a 14,000 pound fifth wheel or goose neck trailer provided at least load range D tires are used. OEM brakes (disc front, drum rear), suspension components and springs are adequate for this weight range.

Do not overlook your hitch rating. 10,000# is the max for a 2" receiver with a 2-5/16" ball and weight distributing spring bars. The 2-1/2" Titan receiver is rated for 12,000#. Fifth wheel and gooseneck hitches rated for up to 25,000 pounds are available.