Hello, I am looking for someone with some knowledge with regards to rim and tire sizes. I have a 1990 Chevy single cab shortbox 2wd, not lowered or anything. I plan on figuring out what i am able to lower it after i get the tires i want underneath the truck. I was wondering if someone would be able to tell me whether or not 20" rims would fit under this truck without any mods and prior to lowering. If there is an easy way of figuring this out....would like to know. I am unable to drive it as the engine is not installed at the moment. Any help would grealty be appreciated. Thank you, Jordan.