Did you know?A 'Vortec' 8.1L V8 produces 340 hp (253 kW), for the three-quarter-ton 2500 series.
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If price is the most important then you will go with the 285's as they will be the least expensive. On that note as FH said you should be good to go with Keys. , I've heard of some who simply can crank their torsion bar up and get these to fit but it's going to be trial and error. Where do you live? I can't believe there is no Truck shop close to you?
I don't think the shocks will make a difference in the height of your AV. I can tell you for a fact that you should be safe going with the Furd keys (cranking to get about 2-2-1/2" or so), 1-1/2" coil spring spacers, 4 longer shocks and 285/70/17 tires. That is my set up. You could attempt to crank on the stock keys to see how much you can get out of them but keep in mind you are going to increase the travel on the stock shocks which may not be long enough, in the end you will most likely blow out the seals and the shocks will start to leak. If you decide to go with the Furd keys and crank on them be sure you get your AV aligned.
If you go with the 285/70/17 the rear coil spring spacers are not needed, this is up to you. I personally wanted the rear of my AV to sit higher than the front, I didn't want a level stance. If you add the Furd keys, crank on the torsion bars and leave the factory length shocks they may not last that long? Your ride may be affected as well, when you raise the front and add longer shocks you will have more suspension travel.
FH, How much bolt do you have left on your keys? Been tweaking my front end with the new tires and just wondering with the 1 1/2 in the rear, you would probably need to use most of the bolt. Just wondering!
Hey Ski!! Good question, I'll have to take a look. Did you have a problem with the new tires rubbing?
If you are looking to go the cheapest route you can, crank the stock torsion bars and use the 285/70/17 - these tires are technically 32.7" tall. As FH stated, get a front end alignment after you are done. Many people have done that combination. You will probably need to do a small amount of modification to the rear of the driver's side wheel-well liner as the tire will rub slightly on the "bump" that you will see when you look toward the bottom center of the liner.