Need help with backspacing
For the fronts I think you're safe with a backspace of 5.25-5.5.
The max backspace for the rears is 4.5"
I have a duster but I think the rules for backspace still applies. But as for tire size etc. The duster/dart sport/demons have a bit more leeway.
For example I'm using 17's (I know you're using 18's but I hope this would give you some ideas)
I currently have 17X7's up front with 4.25 backspace and I have oodles of room in regards to suspension interference. Could've easily used 5+" backspace. I also have QA1 goodies up front upper (control arms, K-member, strut rods etc.)
The rears I currently have 17X8 with 4.5 BS. with 255/50 tires. I have less than .5 inches from the rear leaf springs.
I do plan on eventually putting 17X8's up front with 5.25" BS (they do clear the control arms and calipers) And 17X9 rears with 5" BS, I will have a rear disk conversion with aftermarket axleshafts on my 8 3/4 that I'm assembling, that will supposedly stick out .25" more than stock, I will likely need a .25 spacer or relocate springs.
My plan is to eventually put 245/45R17's up front and 275/40R17's on the rear.
The rear tires as of now:
For the fronts I think you're safe with a backspace of 5.25-5.5.
The max backspace for the rears is 4.5"
I have a duster but I think the rules for backspace still applies. But as for tire size etc. The duster/dart sport/demons have a bit more leeway.
For example I'm using 17's (I know you're using 18's but I hope this would give you some ideas)
I currently have 17X7's up front with 4.25 backspace and I have oodles of room in regards to suspension interference. Could've easily used 5+" backspace. I also have QA1 goodies up front upper (control arms, K-member, strut rods etc.)
The rears I currently have 17X8 with 4.5 BS. with 255/50 tires. I have less than .5 inches from the rear leaf springs.
I do plan on eventually putting 17X8's up front with 5.25" BS (they do clear the control arms and calipers) And 17X9 rears with 5" BS, I will have a rear disk conversion with aftermarket axleshafts on my 8 3/4 that I'm assembling, that will supposedly stick out .25" more than stock, I will likely need a .25 spacer or relocate springs.
My plan is to eventually put 245/45R17's up front and 275/40R17's on the rear.
The rear tires as of now: