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Who is MRW? Just curious. The place in CA was not always easy to deal with.

According to a spreadsheet that I did years ago, with an 8.5" wheel, 4.81" backspace centers the it up in the wheel well. That's stock SBP 8.75 std length Not having the spring moved and a 275 tire is going to be a tight fit no matter what.

Run a 1/8" spacer if needed as long as the wheel aren't hub centric.

I personally sold multi-hundreds of Centerlines with radial tires in the mid 80's. Even had product seminars with Centerline, they never warned us about mounting radial tires on the wheels.

Heck yeah, that works!!! :)

Looks good. I think you need a shield plate to protect any exposed section of your fuel cell hanging out the bottom.

That'll look real good!

I have 275's on an 8.5 C/L wheel 4.875 BS on my 70. Pretty similar wheelhouse, etc. I only moved the spring over with offset boxes. The rear is shortened a little as well. Using frame relo boxes you'll have a bit more room than I have. I had to trim the fender lip.

If you put them on a 7" rim it's easier. An 8 or 8.5 rim makes section width wider. http://www.forabodiesonly.com/mopar/showthread.php?p=1559522#post1559522 Check Zhandfull's car out. Springs in frame. It's tight. Trimming the fender lip will help.

That car look a lot like Wayne Smothers car out of Oklahoma. He's not here at FABO. He's on moparts and goes by "Big Squeeze".

If you have 5.5 backspace and add .75 in spacers to get the wheel where you want, you would need a wheel with 4.75" backspace. The spreadsheet I created computes a 15x10 wheel with 5.5" backspace will be centered in the wheelhouse on that car.

48" to wheel mount surface or housing flange?

Have a set built. Summit will have it done with one of their vendors. Might cost a couple bucks more than the listed pricing. I'd call summit customer service.

5/16" per inch on each side. So figure a ~5.75 BS to get the wheel centered.

6" of backspace should center the wheel in your wheelhouse. This assumes, no relocation or mini tub. Figure out from there how much less you can run to keep the tire out of the outer lip.

A 5 year old thread revived.

Great post!

So you took what summit had on their site as a guarantee when they aren't actually producing the wheel? Those estimated ship dates are terrible sometimes. Notice it says "estimated". I recall when Ede victor BB heads were nowhere to be found. Those ship dates rolled over every 3-4 weeks for a...

Yep, that backspace is going to be REALLY tight on your 1/4 panel. I don't think it's going to work without trimming, especially if the car sits down on the tire.

Only 1.8" longer and they added 2.5" of backspace to each wheel... hmmm. Here's some correct info on axle housing and drum to drum lengths. http://www.moparts.org/Tech/Archive/axle/16.html

Error #1 - 62-70 b rears ARE NOT the same width... Period! Error #2 - 53.2" LOL... nope. Error #3 - 1.8" F it, believe what you like.

That article is full of bad numbers. 68 B body rear is 3" longer in total than an A body. 60 1/8 vs 57 1/8. To put wheels in the same spots, they need 1.5-1.75" more backspace on each side. They can actual have more backspace change.

If you have a jig, and a method to remove the SBP centers, then yes you can do it. There is a company that sells wheel shells and you need to get the correct ID to make them work.

If you want the wheel centered in the wheeltub, it takes about 8.8" backspace which may be tough to find. That backspace is from rim edge (+.5" each side), not bead. A stock A body 8.75 rear with BBP conversion uses ~7.75" backspace 10" rim to get them under the car.

What about the difference in standoff distance between SBP and BBP? Look at teh sticky, top of this forum about wheel/tire combos.

http://www.rallyamerica.com/ They are near Fresno. Never used them, had one friend that was happy with the wheels he got.

Hard to see. 245/60/14 215/60/14

For 8.5's this is about spot on. I just measured the ones I got from my E-bay guy. Shank: Diameter .678 Length .795

Yep, 3.5" skinnies are different than the 5.5" wide and up wheels. If you need lugs for the wheels, this guy from E-bay is great. http://feedback.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewFeedback2&userid=lugnutkingiv2005&ftab=AllFeedback He made me a split set of open end lugs for the thinner...

Everything needs to be PERFECT to get them in your wells.