Wheel/tire max size

[evilmopar]

For stock wheel tubs and stock length axle from a 66 Charger, THIS is about as good as it gets. 16x9.5 rims, 295/50R16 rubber

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That looks awesome! what BS do you have on those rims? I'll try to fit a 295/50 or 60 R15 on my 64 fury. No tubs but moved springs and a A-body Dana 60. rims i have are 9" steelies with 3,5" BS...

 

[33 IMP]

That looks awesome! what BS do you have on those rims? I'll try to fit a 295/50 or 60 R15 on my 64 fury. No tubs but moved springs and a A-body Dana 60. rims i have are 9" steelies with 3,5" BS...

With moved springs and essentially a narrowed rear, i dont think we can even come up with an educated guess as to what would work for you. Time to measure, measure, measure!
On a rim with the right backspace, a 295-60x15 should be no problem. I have almost the exact same size tire on my 62 (10.5x28 slick) without moving springs or tubs. It is real tight though. You should have lots more room.