I don't have a body lift. I have 2" shackles and a tbar crank. I haven't tried to put 31's on but I'm planning on it when my all terrains start getting bald

 

I've been on the s10 forums and I've seen some people with blazers that only have a 2 in body lift and they are stuffing 33's in. How much trimming would I have to do to stuff 33's?

 

I'd say quite a lot.
You can fit 31's under your truck now with the lift you have. There are a lot of people with 2" shackles and a tbar crank that have 31's on. You will still have rubbing issues at full lock though.
Post a link to where you see these 33's on S10F. I'm curious...
Also, keep in mind that the majority of S10F rides will never see anything off the pavement. Most of it's members go for show instead of functionality. It all depends on what you plan on using your truck for.

 

heres the zr2 the one guy posted and said he only has the shackles and tbar cranked and he has 34's



and heres the blazer with the 33's that he says he only has a body lift and a lot of trimming. It does look like he can't turn his wheels very far.

I would like to fit 33's so I probably will get a body lift closer to when I'm going to get new tires. if I get a body lift thats 2 inches higher than before and 33's are 2 inches bigger than 31's so I'm guessing I'll have that minor rubbing but I don't mind a little trimming