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Exactly how much grinding and where is needed to fit a bart 15x12 wheel with 4" of backspace on a 3/4 ton dana 44? Will it compromise strength in any way?
With 12" wide wheels you are probably going to be spending alot of quality time with your grinder. Most people say you need to grind your calipers which is true but the most grinding for me was on the caliper brackets, not the calipers.
When grinding I would use a flap disc they cut faster and cleaner IMO. I had 15s with 3 3/4 backspacing and I just would grind until I could spin the wheel freely
D60 and 4.25 backspacing here, plenty of grinding, but well worth it.
If you don't have the tires yet, get 16s or 17s. Preferably 17s. It's the wave of the future.
Flap discs are slower and remove less material than a regular disc, but will make a cleaner cut. No use in this application, unless it's to finish off the job.