For the M4 Sherman, there's no better book than "Sherman" by Hunnicutt. Be warned that this book is out of print and extremely expensive. But, if you've gotta have all the information, this is the book to get on the Sherman.
I have no idea what book best covers the T-34 series.
For the Tiger, there's no better coverage than the Jentz & Doyle books on the Tigers from Schiffer Publishing. There's three volumes, the first covers design to Tiger 1, the second, already mentioned covers design of Tiger II through Tiger II and the third volume covers tactics and combat.