Chrysler hasn't yet announced any changes to the 2010 Dodge Ram 1500, but this spy shot of an instrumented test truck appears to give away two revisions intended for the performance-oriented, two-wheel-drive Ram R/T model, says spy photographer Brenda Priddy.

The 22-inch, five-spoke painted aluminum wheels with low-profile Goodyear Fortera P285/45R22 tires are new (the 2009 Ram R/T's rolling stock was 20-inch, five-spoke polished aluminum wheels with P275/60R20 Goodyear Wrangler HPs). The second update appears to be the addition of a removable soft tonneau cover. The R/T's 4.10 rear axle and "loose" torque converter, along with its 390 HP, 407 lb-ft torque 5.7-liter Hemi V8, helps the muscle truck do zero-to-60 in just under six seconds.

Using a tonneau cover to smooth out airflow over the cargo box could help the 2010 R/T gain back some of the fuel efficiency sacrificed for its strong off-the-line performance.