1968 roadrunner question on rear setup

[nazar]

I am going to start working on a 1968 roadrunner 383 car and had a question

Look at this website www.hotrod.com and look at the header, there is a creme roadrunner with some badass black wheels, sitting low

My question was on the rear end and tubbing it. DOes that car appeared to be tubbed? And if so, how do i figure out how much to tub it, and how to go about it? Do i just buy a rear end thats shorter? What happens to the rest of the suspension, do i have to relocate it??

I dont want a huge tub like those drag cars, just enough to clear say a 18x12 wheel in the rear. The fronts I am going to convert to a PTE coilover suspension with tubular control arms, however I have no idea how to go about the rear, but that car looks AMAZING and is exactly what direction I am going in.

ALso, as a bonus, does anyone know what wheels those are? I cant quiet tell

I want the rear to tuck and I know a wheel that big wont, I think the most you can stick under there is like a 9.5 wheel on a 275

I want a 12" wheel on 335s or so.

Thanks guys, cant wait to start working on it, my first project, im 22 Ive been in the import scene for a while building up my 2nd car, 99 eclipse gst with a fuly built motor making 420whp and complete suspension/wheel/tire/trany work but i have always wanted to build a badass hotrod, modern style that handles and goes

[nazar]

also does anyone know any good suspesion/drive train websites that sell mopar parts? PTE makes a front suspension kit with all new bushingsjoints/control arm/torsion bar or coilovers

I need to address the rear suspension and rearend

THe motor I am just going to buildup the 383 already in it, its healthy and already has a big cam

Mopar magazine made 460hp on a stock 383 with cam, headers, intake manifold and a demon carb..thats plenty, that with some nitrous is the way I am going to go to stay on a budget

[TravisB]

I believe that is a car called the Hammer built by Steve Strope. To minitub the rear we usually order the wheels I want with BS(back spacing) I want then cut the wheel tubs out until they fit build new wheel wells and then take a measurment and order a new rear diff or have the existing one shortened. A modification like this will require some suspension modifications as far as mounting pionts etc etc

[XcYZ]

Welcome Nazar. We need more Mopars and your project sounds great.

The process that Travis mentioned for the rear suspension is definitely the way to go. For the other questions, unfortunately, I'm not up on Mopars. I'm sure others here can give some insight.

[nazar]

Well, I think for a tire that wide the axle will have to be shortened.

I am assuming it has the 8 1/4" rearend in it, which if it does, I will keep it and just beef up the internals. I think the less powerful mopars came with the 7..." rear end, and the real beasts had the 8 3/4". I will just rebuild it and put a mopar diff into it along with gears.

The tranny is a 727 3 speed auto...is this a decent tranny to keep for a while and just put a shift kit in it and possibly a basic rebuild? I dont want to spend the extra money on a new badass tranny just yet, wanna get the car running well and rolling and some other stuff done first, if it aint broke, I dont wanna completely fix it just yet.

I will most likely need a leaf relocation kit, I will keep the leafs in the rear, add some traction bits, shocks, subframe connectors, and possibly a coilover kit in the front.

But for now I want to figure out the rear suspension and how to get a 18x12" wheel on a 335tire out back. The front I will do a 17x9" wheel, 275 tire if it fits.

I want to get a complete rolling chassis going and complete. The frame has been already taken off and powdercoated!! which is great. The body is straight because a body shop used to own it, they cut out the rust spots and its all in pretty good shape, ready to sand and paint.

[TravisB]

I think competition engineering makes leaf relocators.....moser could be probably help with narrowing the axle. What wheels are you wanting to go with?

[DRJDVM's '69]

I just bought a '70 Barracuda, which si the first Mopar for me too, so I'm in the same boat as you. I have no idea what the "tried and true" info is about backspacing and rim/tire size etc etc.

When I did my '69 Camaro, there was gobs and gobs of info about what backspacing and rim/tire size would fit a 1st gen. It was easy to find out. This car is going to be a bit trickier to make sure I get stuff that will work.

[nazar]

Originally Posted by DRJDVM's '69

I just bought a '70 Barracuda, which si the first Mopar for me too, so I'm in the same boat as you. I have no idea what the "tried and true" info is about backspacing and rim/tire size etc etc.

When I did my '69 Camaro, there was gobs and gobs of info about what backspacing and rim/tire size would fit a 1st gen. It was easy to find out. This car is going to be a bit trickier to make sure I get stuff that will work.

the wheel deal is quiet simple

You can do all the measurements on the car to get the exact offset and backspacing you can do

Most upper scale wheel manufacturers offer detailed instructions on how to do so and get the exact wheel to look just like you want

I pretty much want to maximize all the space in the fender, from the outside to the inside fender, as much as i can and as wide as i can, because its a huge car and it needs wide tires to even it all out