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I know you guys get a lot of BS tire size questions so ill make this short and sweet.

I have a set of wheels that are using 235/40/18 tires. 2 of those tires wont pass inspection and i dont have the cash for a new set of 4 yet. But i do have a set of 225/40/18s sitting in the corner. can i mount these up without blowing up the t-case or center dif.

I know first reaction is no you cant.. but the tire size calculator put out some interesting numbers..
235/40/18

side wall 3.7 in
Radius 12.7 in
Diam 25.4 in
Circumference 79.8 in
revs/mile 794

side wall 3.5
radius 12.5
diam 25.1
circ 78.8
revs/mile 804

all that making up to just a 1.2% difference front to back
but add into that the complications that i would be stretching the 225 some and that the 235's are just barely passing.

what kinda tolerances are we dealing with here.

that's my conundrum.. thoughts?