Does my 95 Tahoe have a 4 bolt main and a forged crank?

Where do I find the specs on my 1995 Chevy Tahoe Sport model 2 Door, four wheel drive?

You can check the casting number on the block. That will tell you which mains you have. Not all truck blocks came with 4 bolt mains.
As for the crank, I don't know of any other way of checking w/o looking up the casting number on the crank also.

Here's a link to casting numbers:
GM casting numbers