Any ideas on why my auto trans won't downshift to 1st gear when manually placed into 1st gear. It will limit itself to first gear only when accelerating in 1st gear but it won't allow engine breaking to decelerate on decents. It seams like it is in neutral when no gas is applied, allow it to coast and even pick speed on a steep decent. Problem only occurs after the engine has warmed up. 2nd gear functionality works fine including engine breaking. Vehicle is a 4x4 with Auto/Hi/Lo transfer case and a 4.1 LS diff.
Thanks, Jeff