The Academy M3 Lee/Grant and the Academy M3 Stuart light tanks (Early and Late versions) also have complete (although slightly incorrect) interiors.
VR, Russ

They have more than the gun breech and seats— there are interior details as well— I have both kits, and they come with turret rings, baskets, interior storage. Transmission housings, and MGs— as well as interior storage for ammo and radios. And in actuality, there isn’t that much in the real thing!
VR, Russ

So, here is what I do NOT understand....why has nobody made a kit of the most popular model tank in the history of the WORLD with an interior? I'm talking, of course, about the Sherman.

Stephen C. Willoughby, The "full" interior I mean is to have engine, fighting compartment, driver compartment, transmission, etc. And why my "full" is in the"", it is because barely any kit can keep up with the details and possible variations (crew modification, manufacturer modification, even modification by order).

About the Academy stuff, I surely need more research on these kits...

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Stephen C. Willoughby, The "full" interior I mean is to have engine, fighting compartment, driver compartment, transmission, etc. And why my "full" is in the"", it is because barely any kit can keep up with the details and possible variations (crew modification, manufacturer modification, even modification by order).

About the Academy stuff, I surely need more research on these kits...

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In that case, about three quarters of the kits mentioned in the other responses here aren't "Full" inteiors either, as they have details in the fighting compartments, but not the engine compartment (sometimes it's the reverse, like the Italeri M47 and Tamiya Bundeswehr Marder IFV kits that had engine module parts, but nothing in the the turrets or drivers' compartment.

Well, if you are considering the engine and engine compartment as part of a "full" interior, you'll need to modify your requirements a bit, as almost no kits include all the plumbing, cabling, electrical wiring (as in distributors, plugs and cables). Many of the kits you've listed may or may not include the basic engine, exhaust system, drive shaft linkage, or plumbing. More often than not, you get a "representation" of the real thing in both the crew compartment and the engine compartment. The Rye Field Tigers are among the best I've seen, and even they fall short of complete systems. By the the way, the Tamiya Sturmtiger could be added to the list of fighting compartment interiors-- although it is abbreviated.
VR, Russ

In that case, about three quarters of the kits mentioned in the other responses here aren't "Full" inteiors either, as they have details in the fighting compartments, but not the engine compartment (sometimes it's the reverse, like the Italeri M47 and Tamiya Bundeswehr Marder IFV kits that had engine module parts, but nothing in the the turrets or drivers' compartment.

Having kits with full interiors is just a another reason for the kit manufacturers to jack up the cost of the kits
And I'm not wasting valuable build time putting in a interior that you can't see

And the list goes on! There are, at this point, a rather large and rapidly growing number of 1/35 "w/interior" kits covering some WWI, many WWII, and many post-war subjects - Brits, French, German, Russian, US subjects. A comprehensive list will become pretty long and become out-dated shortly after being posted!