  We present an initial look at the far infrared-radio correlation within the
star-forming disks of four nearby, nearly face-on galaxies (NGC~2403, NGC~3031,
NGC~5194, and NGC~6946). Using {\it Spitzer} MIPS imaging and WSRT radio
continuum data, we are able to probe variations in the logarithmic
70~$\mu$m/22~cm ($q_{70}$) flux density ratios across each disk at sub-kpc
scales. We find general trends of decreasing $q_{70}$ with declining surface
brightness and with increasing radius. We also find that the dispersion in
$q_{70}$ within galaxies is comparable to what is measured {\it globally} among
galaxies at around 0.2 dex. We have also performed preliminary phenomenological
modeling of cosmic ray electron (CR$e^{-}$) diffusion using an image-smearing
technique, and find that smoothing the infrared maps improves their correlation
with the radio maps. The best fit smoothing kernels for the two less active
star-forming galaxies (NGC~2403 and NGC~3031) have much larger scale-lengths
than that of the more active star-forming galaxies (NGC~5194 and NGC~6946).
This difference may be due to the relative deficit of recent CR$e^{-}$
injection into the interstellar medium (ISM) for the galaxies having largely
quiescent disks.
