The best I can describe it is a chugging kind of an unbalanced tire. I can feel it in the steering and in the seat, its not terrible but is noticable. Tires seem fine and pressures are right, tranny fluid looks good and smeels fine. I dont notice any rpm changes and the obd2 doesnt show a miss. What could be causing this vibration?

 

Out of balance tire... Hung up brake caliper causing the rotor to warp...

 

I will check the calipers and rotors today, doesnt seem like my bad rotors I had before but you never know, also do tires randomly unbalance themselves or is it only when it has soem other issue?

 

I have had ice and mud cause tires to become unbalanced. When you are checking your brakes, check the insides of the rims for debris. It does not take a lot to unbalance a wheel.

 

Ok checked brake they seem good on all four, I pulled out the torque wrench and double checked all wheels the left rear had 3 lugs that were slightly under spec. In a quick test drive it seemed fine. I will repost if it seems to still be there.

 

Uneven torque can cause a rotor to not sit true and cause a pulsation.

 

OK update it is still doing it, it does seem like an unbalanced tire, but it seems to do it between 32-45F which seems odd, if its hotter it wont do it, and if its colder it doesnt seem to. If it is an unbalanced tire is there a way to narrow it down so I dont have to rebalance them all?

 

Might check for a bad steel belt. Or any unusual sidewall blemishes? Stab in the dark.

To decide if it's one or the other tire you could rotate em I guess until you narrow it down.

 

Yah no luck with the steel belts, no bumps or dents on the sidewalls, and all tires have their weights attached and look like they are on solid.

 

Try puttin on a buddie's wheels and tires f(if you have one with a blazer) and drive it around, see if the problem persist. That'll let you know if it's your tires and/or rims or if it is something on the truck that is messed up.