well i am going to start building a 74 plymouth duster.so frist question is what is the bigest wheel tire combo that you can put on the back of a 74 duster with everything in the stock location?I would like to put a 15x10 weld prostar and a m/t 315/60/15 drag radiel tire on it. but not sure if it would fit.so just checking to see if anybody has done it etc.thanks Mopar65

28x10.5 and that is tight, 10' wheel with 4.5 BS,

Bobby, I don't think you can get a 10" rim on it without moving the spring in. My Duster was mini tubbed with the spring moved into the frame, stock width 8 3/4, and had a 29x10.5W on a 10" Pro Star. The front lower edge of the wheel well had to be trimmed too.

cant get 10" on stock location,!! tire will hit wheel well and spring,
something has to move,ie spring inwards,
the 28 tall tire the rear end must be moved back about 1 -1.5 inch to clear the front 1/4 panel tried on 2 of my dusters, was the only way,
correct on 4.5 back space tho!

on my 75 i put a 1/2" plate between the the front spring bracket and mount. i run a 28 x 11.5 dot.(same as a 9" slick)rim is a 8" with a 4"back space.i run hd springs.i can put a wider tire,but it would stick out past the wheel well.

ok thanks for the info guys. I guess i will just have to minni tub and move the springs in on the duster before i buy new wheels and tires.again thanks for the help . Mopar65

Check out this link' go to post#18 by 7172Duster It has 10 inch rims. Most Dusters you have to trim the front lip to use any tire taller then 28.5 to 29 inches...Keefe

http://www.forabodiesonly.com/mopar/showthread.php?t=14254

My Duster has been mini tubbed and the springs moved into the frame rail. 10" Prostar with 6.5 back space, MT 29.5/11.5 or the 29.5/10.5W fits with tweaking to the front wheel opening. It all tucks into the wheel well too so the tire isn't sticking out. Wish I could find a pic but I lost them all. I'd take another pic for you but it's stored in the trailer without and engine right now so that's a PITA.

The largest I could fit w/o the tire sticking out past the wheelwell is a 15x8.5. Tire size is 255/60-15.

I've got a '75 Duster and I was able to get a 28/10.5 M/T ET Drag under it on an 8" rim (5.5 backspace) with no modifications. I was using a '68 B body 8 3/4 (60.125" drum to drum). I had right at a 5/8" between the tire and spring.

I have since move to a Dana that I cut to 54" (disc to disc). I now use a 10" rim (3.5" backspace) and for now the same 28/10.5 tire. I switched to an offset shackle that is not only offset but moves the rearend back an 1" which helped with the additional length of the Dana. I have much more clearance to the spring now and can probably use a 29/11.5 QTP.

If you need a rear end and rims, all that I took out is for sale.

factory a-body rear with dr. diff axles, mini-tub, springs moved, 325/50r15 on 15x10.25 w/ 7.5bs