Tire replacement

[makspringcole]

Hi,

 

I'm thinking of putting 285s on my stock 2005 1500HD. Is it suggested that I torque my torsion bar to level the truck off? If I do this will I need an alignment? As well, once the tires are replaced how can I configure my speedometer to properly read and ensure that the anti-locks works as they should with the bigger tires.

 

Thanks

[99silveradoz71]

Welcome, you'll need the dealer or a shop that can reprogram your truck's computer to recognize the change in tire size and make your speedo accurate.

[carneyman]

Whether or not you want the truck leveled is up to you. I did it for the clearance. It is HIGHLY recommended that if you adjust the t-bars, then get an alignment pronto.

[makspringcole]

Whether or not you want the truck leveled is up to you.  I did it for the clearance.  It is HIGHLY recommended that if you adjust the t-bars, then get an alignment pronto.

 

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Did you find that the ride changed after leveling.

[STPETEBLUE]

I heard it couldn't be adjusted above 265 tire size.

[makspringcole]

I heard it couldn't be adjusted above 265 tire size.

 

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Stpetblue,

 

Do you mean that you cannot put 285's ?

[STPETEBLUE]

I heard it couldn't be adjusted above 265 tire size.

 

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Stpetblue,

 

Do you mean that you cannot put 285's ?

 

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No, just that the speedo and ABS cannot be re-flashed accurately above the 265 size. You can put any size on that will physically fit, but getting the computer to understand the ratio differential may not be possible.

[Chanks7]

I heard it couldn't be adjusted above 265 tire size.

 

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Stpetblue,

 

I think that may be true of the GM scan tools but aftermarket it can be done, such as with a Hypertech tuner.

 

Do you mean that you cannot put 285's ?

 

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No, just that the speedo and ABS cannot be re-flashed accurately above the 265 size. You can put any size on that will physically fit, but getting the computer to understand the ratio differential may not be possible.

 

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My friend is running 35"s with stock computer tune on his '03 Sierra, everything works fine. I think you would be fine with 285's. He had the hypertech but it messed with the tranny shifting so much that he took it out.