I did this exact same swap to a 1994 - the truck was a little sluggish
after, especially on the highway through the mountains here in
Colorado. The truck had quite a few miles on it, and the transmission
ended up going out while on a trip through South Dakota.
The truck will still run fine, your shift points will be a 'little off'
but you won't notice for the most part - what you will notice is the
loss of power - you won't get off the line like you used to, and towing
will be more difficult. If you love your truck, don't do it. All it
does is add stress to the parts, and that's not enough of a tire size
jump to really make the truck better in any way. Get an aggresive
looking tire in the size you have now and be happy - OR - jump up to a
bigger tire yet and change the gear ratio's to match.