Modifying my lift/options and recalibrating Speedo

[Optimusprime]

Hey all. New to the Forum. Just purchased a used 2006 Silverado 1500HD. Currently the truck has 35" tires on it. It feels like a slug when I accelerate (to the point that when I remove my foot from the brake the truck doesn't move) so I am going to downsize my tires a bit to a 33". Stock gears per the info in the glove box is 3.73 so I am going to assume at this point that is what this truck has. The rear has a 2.5" spacer block. Can I assume the rear end lift is then 2.5"? The front sits 1/2" higher than the back and it kind of annoys me. What I would like to know is what my options are for bringing the front down a 1/2" or slightly more. Bonus question is what can I do to fix my speedo or to recalibrate it? It is off by about 5mph at 35mph. Any help is much appreciated! 

[Optimusprime]

Here is what I have. I believe it to be an RCD 4-6” lift.

 

 

 

Now, is it possible to lower the front a little to level out with the back?

 

 

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[CamGTP]

Crank the torsion bars down a little, that will lower the front ride height. Don't go to much or it will mess with the ride quality. It should level it out with just a small adjustment.

 

Going from 35's to 33's will bring the speedo back in line but still be a tad be off. Stock tires are like 31.5 or 32in from what I remember and going to 33's will only make it off by 1-2mph instead of 4-5 like you are seeing now. Even going to 34's would bring the speedo in closer.

 

You'd need a tune or tuner to get the speedo completely accurate.

[Optimusprime]

So I’m understanding this correctly...turn the key bolt in so to tighten it. That will then rotate the key downward which will move the front control arms up making the tires come closer to the fender?


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