[allchevy58]

On my 64' C30 I wanted 06' dually wheels so I had adapters made from Motorsport Tech 2" 8X6.5 4.460" to 8X6.5 4.595" tall pilot 14mm1.5 studs for the rear and same without the tall pilot for the front. Put on LT235/85r16 tires, with 514 gears I didn't even try to go on the highway. Bought a HD70 out of a 77' Chevy C30 dually, installed 354 gears and the mileage was terrible and terrible on hills. Changed to 4:10 gears and it is perfect, 3,000 rpm at 70 mph. My truck is pretty heavy being 12' flatbed. The HD70 brought outside of the tires right to edge of the flatbed, looks nice. Bolted right in, had to shorten back half of driveline. I had to have new adapters for the HD70 for hub centric, so if you decide to put 06' dually wheels on the original rearend, I have those adapters available.