[JoeC]

The only reason I can think of that they offered no higher then 3:36 ratio is because of potential TH400 trans oil temp. problems. There was some problems with overheating with the 68 Corvette big blocks and some changes were made in 1969 but engineering may have felt the increased trans RPM with a 4:11 ratio would have caused high temps. in the trans oil cooler thus in the radiator. While the Corvette slanted radiator was good for bouncing a radar signal, it may not have worked as well as the Camaro/Chevelle set-up that did use the TH400 with the 4:10 ratio. Just guessing here.