I asked this in the wheel section and havent got a response yet, so I thought I would try here. How much tire can I fit in my 71 chevelle without any mods to the frame or axcle? Just mini tubs. I know a 315/35/17 w/17x11fits in the stock wheel wells, but I want to fit 345/30/18s on 18x12. They measure 26.5x13.5"

Thanks - Ron

No one here has mini tub a chevelle???

No one here has mini tub a chevelle???

Well, mine is mini'd, but it's a 67. Can't tell you what will fit your car. I gained about 1.75" of additional width. HTH.

No one here has mini tub a chevelle???

It's a bunch of work for such a little gain.

you can widenyour wheel wells but the problem being is you might run into interference with the shock mount

Only adding the tubs will gain you little in the way of tire clearance. This is because the inside of the stock wheel well is flush with the frame. I gained about two additional inches by also notching the frame where in passes by the tire. The "notch" is boxed in with 1/8" plate steel and gussets. Even being lowered like my car is, I can fit a tire with a 14.5" section width room to spare. I also drilled new holes in the lower shock mounting bracket that are slightly up and to the inside of the stock holes. This allowed me to swing the shocks inward enough to clear the wider wheels. No additional modification to the bracket was necessary.

That being said... If I had to do it all over again I probably would just go ahead and do a full tub job. You're doing about 80% of the work already!