if i was running 325x60r18s (34.6 O.D.) but had a 35x12.5 (34.8 O.D) fullsize spare on would that be ok in 4wd? Reason Im asking is If i decide to get new tires I can save almost 300 bucks going with four 325's over 35's, But I have a brand new 35" spare that i take on trips and dont want to have to replace that also. IMO I dont thing the difference in size is too great to be in 4wd if i had to run the 35" spare.

 

That's close enough, should be fine. If you have to run the 35, just let a bunch of air until it visibly matches the height of your other tires.

If you have lockers though it could be a problem...do you? And if you do what type.

 

You will be fine.

 

No lockers. I figured it would be fine just wanted to found out here rather than out on the road.

and the fact that i can save 300 bucks on the 325 over the 35's for the same exact tire

 

It will be fine.