It depends on what they use. The original torqueflites were very fast shifting transmissions. The electronic systems on the ultra-drive based transmissions are not quite as fast. Also remember the quality of manual transmissions for that time as opposed to now day standards. Newer manuals are much easier to shift, so remember to include that into the equation. If they offer the dual-clutch automatics that they are working on, that will more than likely be the case. I'm not sure about the MB designed W5A580. The very limited knowledge I have along with the fact that very few models had both the four-speed auto (42RLE) and this MB unit, seems to show that there was little difference between the two.

Vanishingpoint, Jay Leno is a full blown gear head. He has tons upon tons of amazing cars, including a hot rod that has a Patton tank Hemi engine in it. They had to replace the greyhound sourced transmission with one from Allison.