Wheel Fitment and SBP – to – BBP, Lessons Learned (1969 Dart)

I looked in to an 8.25" rear end with the BBP, but learned it would mean I'd need my driveshaft shortened.

Plus, I'm actually content with the 2.76:1 ratio in the current 7.25" differential; this car is going to see a fair share of highway miles, and I'd prefer the 2400 RPM cruise over the 3000 RPM cruise I'd risk having by finding a local, used 8.25 that would likely have a numerically higher ratio. 2.76:1's are not so common.

If I do end up running into rubbing problems then I suspect an 8.25" rear will be the way to end up remedying it. I've bounced the car all over the place while parked (it's not yet driveable) and it doesn't rub at all. For now, my engineering knowledge and assessment of the facing surfaces and load paths through these billet adapters allayed my concerns about the safety of using them.

"Rolling out" the fenders? I hadn't considered that. You mean some way of pushing the sheetmetal uniformly outwards?

If I were putting a big block V8's worth of torque through everything, I'd likely have reconsidered. But for a hundred bucks and 20 minutes of work, adapters seemed like a decent way to go.