1990 Chevy C3500 Wheel and Tire Combo's

Good Afternoon Ladies and Gentlemen:

Needing some information realting to my 90 chevy c3500 dually project. I am wanting to remove the dual wheels in the rear of truck and run Mickey Thompson Sportsman S/R tires 31x18.00R20LT and 18" wheels up front. Does anybody know how to or even a wheel that is made for the rear that is 20" with anything that is 16"-18" wide with the right back spacing??

Would like to put the Mickey Thompson HR-1 wheels for they make them in 18" and 20" but I don't think they are drilled for an 8 lug

In project mode right now the truck is going to be bagged but its not going to be laying frame. Mono-Chromatic paint thyme of white and blue pearl. Projector headlights that will be sunked back with a billet phantom grill. Smothed front bumber and rear roll pan.

Any info would be great I am an older guy just digging the late 80's slammed trucks and figured hell I got an extended cab dually that would be sick long and lean looking pro-street truck rollen around.

Does anybody know the Back Spacing, and lug pattern of a 1990 Chevy C3500? Could you recomend an 8 lug wheel that is 18"x15",16",17" that will have the right back spacing built into it to remove dual wheels on the rear of truck and run one wide wheel instead of dualls?

Swap out the one ton axle and front suspension with half ton parts and you will be able to find a lot more wheels. The rear axle from a 454SS truck is still a 14 bolt rear but is 5 lug.

Yes thats do able. I want too use what i have. I figure its easier to just change the axles to a five lug pattern, instead of changing the whole axle system. And its much cheaper.

That's how my truck in my signature was done.