-So I wanted to see if it was possible to do a 6x5.5 conversion on the Trailblazer. I've read a lot of post of people wondering if it is possible but no one has attempted it. I am planning on doing the conversion next spring but I needed to know is it even possible so I did a ton of research and this is what I have found.
The front and rear rotors are almost identical to a 99-06 Silverado and 00-06 Tahoe. The rear is a perfect match and the front is 4mm deeper than stock but is ok once you read about the hub. This is a side by side comparison to see for yourself.
Now the front bearing hub was the big question would it fit. I found pictures but no dimensions.
So I needed to get one to test fit it. I went to a junk yard and pulled a hub from a 2000 Silverado.
The front hubs are identical for Silverado's and Tahoe's for 99-06 for the exception some 2003-06 Tahoe's can have a different hub but I'm not sure why. So I test fit the hub on the Trailblazer and the hub opening on the Trailblazer spindle is to small. The Silverado hub almost fits but you need to grind 5/16" off the opening on the spindle. The Silverado hub is 3 7/8" in diameter and the Trailblazer is spindle hub opening is 3 9/16".
Next the bolt holes on the spindle to mount the hub are too small. The Silverado uses slightly larger bolts so they would have to be drilled out slightly bigger. I'm not sure how much more but it is very minimal.
So far not what I was hoping. I tried to connect the ABS plug to the Trailblazer and the plugs don't match so the stock plug would have to be soldered on.
Here are the two side by side and you can see how much larger the Silverado hub is.
I measured the hub from where it contacts the spindle to the face plate that mounts to the wheel and the Trailblazer is 1 7/8" and the Silverado is 1 15/16". The Silverado hub sticks out a little more which is needed due to the rotor being a little deeper than the Trailblazer. It looks like it would fit the brake caliper with no issue but I'm not 100% since I can't bolt the hub and rotor on yet. The Silverado rotor is 4mm deeper that the Trailblazer which is between 1/8 and 3/16" and the hub sticks out 1/16" more that the Trailblazer so the Silverado rotor with be 1/8" deeper that the stock set up.
Ok, I know its a lot of info so far but now this is the rear set up.
So Trailblazer has an 8.0" 10 bolt rear end with the left axle shaft 846mm long and 28 spline. The right side is 798mm long and 28 spline. The only 28 spline made is for the Colorado's and Canyon's but they are several inches to short. I searched for days but could not find anything that fits. Silverado's and Tahoe's have a 30 spline rear axle. So they only option for the rear is to have a machine shop weld up your bolt holes on your rear axle shafts and redrill the 6x5.5 lug pattern. The good news is that the rear rotors from the Silverado are a perfect match and do not need any modification.
So is the 6x5.5 conversion possible. Yes, but you need to do the following:
Have a machine shop drill out your spindle hub opening to 3 7/8" or slightly larger to ensure it fits,
Have a machine shop drill out the bolt hole opening on the spindle to the diameter of the Silverado bolts,
Connect the Trailblazer ABS sensor plug to the Silverado hub,
and have a machine shop weld up the rear axle shafts and redrill the 6x5.5 bolt pattern.
Everything else should bolt up.
I am not attempting this yet because I am not getting my Sierra replica wheels until next spring and I don't have Silverado wheels to put on. But hopefully this encourages someone to try it. On paper it looks like it should work. What do you all think?
The front and rear rotors are almost identical to a 99-06 Silverado and 00-06 Tahoe. The rear is a perfect match and the front is 4mm deeper than stock but is ok once you read about the hub. This is a side by side comparison to see for yourself.
Now the front bearing hub was the big question would it fit. I found pictures but no dimensions.
So I needed to get one to test fit it. I went to a junk yard and pulled a hub from a 2000 Silverado.
The front hubs are identical for Silverado's and Tahoe's for 99-06 for the exception some 2003-06 Tahoe's can have a different hub but I'm not sure why. So I test fit the hub on the Trailblazer and the hub opening on the Trailblazer spindle is to small. The Silverado hub almost fits but you need to grind 5/16" off the opening on the spindle. The Silverado hub is 3 7/8" in diameter and the Trailblazer is spindle hub opening is 3 9/16".
So far not what I was hoping. I tried to connect the ABS plug to the Trailblazer and the plugs don't match so the stock plug would have to be soldered on.
Here are the two side by side and you can see how much larger the Silverado hub is.
I measured the hub from where it contacts the spindle to the face plate that mounts to the wheel and the Trailblazer is 1 7/8" and the Silverado is 1 15/16". The Silverado hub sticks out a little more which is needed due to the rotor being a little deeper than the Trailblazer. It looks like it would fit the brake caliper with no issue but I'm not 100% since I can't bolt the hub and rotor on yet. The Silverado rotor is 4mm deeper that the Trailblazer which is between 1/8 and 3/16" and the hub sticks out 1/16" more that the Trailblazer so the Silverado rotor with be 1/8" deeper that the stock set up.
Ok, I know its a lot of info so far but now this is the rear set up.
So Trailblazer has an 8.0" 10 bolt rear end with the left axle shaft 846mm long and 28 spline. The right side is 798mm long and 28 spline. The only 28 spline made is for the Colorado's and Canyon's but they are several inches to short. I searched for days but could not find anything that fits. Silverado's and Tahoe's have a 30 spline rear axle. So they only option for the rear is to have a machine shop weld up your bolt holes on your rear axle shafts and redrill the 6x5.5 lug pattern. The good news is that the rear rotors from the Silverado are a perfect match and do not need any modification.
So is the 6x5.5 conversion possible. Yes, but you need to do the following:
Have a machine shop drill out your spindle hub opening to 3 7/8" or slightly larger to ensure it fits,
Have a machine shop drill out the bolt hole opening on the spindle to the diameter of the Silverado bolts,
Connect the Trailblazer ABS sensor plug to the Silverado hub,
and have a machine shop weld up the rear axle shafts and redrill the 6x5.5 bolt pattern.
Everything else should bolt up.
I am not attempting this yet because I am not getting my Sierra replica wheels until next spring and I don't have Silverado wheels to put on. But hopefully this encourages someone to try it. On paper it looks like it should work. What do you all think?