I've been wondering for a while about the trans codes on the fender tags, so I thought I'd ask the experts. I see quite a few C-Body tags showing D32, which is the code for the "Heavy Duty" 727, if I'm not mistaken. I also see tags with the D34 code, which is the code for "Standard Duty". It seems to me that nearly all of the 383 or 400 equipped cars have the D32 trans code and I have also seen the D32 on the fender tags of 440 powered cars. The thing that has me puzzled is when I see a D34 code trans behind a 440. If the D32 is the heavy duty trans, why would so many of the 383 and 400 cars get it while some 440 equipped cars got the standard duty (which I assume means lighter duty) D34 trans? Do all D32 transmissions have the same internals? In other words, would a D32 that came behind a 383 have the same guts as a D32 that came in a 440 car, or would a D34 transmission that came with a 440 actually be a beefier trans than a D32 that came out of the factory attached to a 383 or 400 engine? Just curious.