Largest Tires For 2006 Sierra Slt 1500

themanfromghs612 · December 14, 2008

Hi all,

I have a 2006 GMC Sierra 1500 SLT extended cab 4x4 with 265/70/r17 on there from the factory.

No lift has been done. Can I fit some 285/75/17 on there?

I found some local ones on craig's list with half tread, $80 for the set of 4.

Thanks for your help.

-Jtanner

p.s. i tried the search tool and nothing relevant came up.

December 14, 2008

It's my understanding that you would need a lift or at least a leveling kit in order to fit 33" or bigger, which I belive the 285/75 17 come out to.

tobias · December 14, 2008

Try searching. This has been discussed in 34,976 other threads.

VMax2007 · December 14, 2008

Try searching. This has been discussed in 34,976 other threads.

At least!

pm26 · December 14, 2008

I like to see someone start a thread with the following title:

"Smallest tires that I can use on a 2006......"

It is the smallest tires that you can fit that will give you maximum towing power and torque, not the biggest ones.

themanfromghs612 · December 15, 2008

So, I can't fit these tires on my truck, can I?

silvy2k · December 16, 2008

Depending on how much adjustment you have left in the factory T-bars you can fit 285-70-17's on stockers. Or you can buy an aftermarket leveling kit to easily clear 285's or even 295's. If you choose to use aftermarket wheels just pay attention to the offset as these trucks can be particular to where the wheel sits.

themanfromghs612 · December 18, 2008

How do I adjust the torsion bars to provide lift?

If there a Tool?

2000DV4.8 · December 18, 2008

How do I adjust the torsion bars to provide lift?

If there a Tool?

To crank the torsion bars, you will need to adjust the torsion key adjustment bolt, which is located in the torsion bar cross-member. The cross-member is pretty much directly below the seam between the front and rear doors. Follow the torsion bar into the cross member, then you will see an adjustment bolt. That is the bolt you need to... well... adjust.

Ok, so now for the adjustment process. You will need a jack and jackstands, a bottle of whiteout, an 18mm socket, and preferably a 1/2" drive ratchet.

Measure the original fender height heights with the truck on flat level ground. Then jack up the front of the truck, and put the jackstands under the frame. Mark the adjustment bolt and the cross-member with whiteout so you can better keep track of how many rotations the bolt makes. Each full revolution of the bolt equals about 1/4" of height. I'd start off with 4 revs, which should net you about an inch.

Let the truck down bounce on the bumper a little bit, and drive it around the block and make a couple of hard stops to let the suspension settle. Then park the truck in the same spot as before, and re-measure.

Repeat as needed until you get to the height you want, it is completely normal for one bolt to have more thread showing, or for one bolt to take more revs to raise the truck (I had to turn my drivers side bolt 2 full revs more to get the truck to sit level).

Just keep in mind, your ride will stiffen up, and if you go over 1.5" it will REALLY start to suffer. Also, if you go much over 1.5", you will start to wear through parts like CVs, tie rod ends, ball joints, and pitman/idler arms much quicker than normal. Keep the height reasonable, and you should have no problems.

And don't forget to get an alignment.