Why will your turbo 350 not engage any gears?

This is usually due to a problem with either the front fluid pump or the torque converter, or both. If the front pump has failed or the seal has failed there will be no fluid pressure to engage any gears. This can also be said for a failed torque converter. Usual signs of this are whining noises coming from the transmission and slippage when the transmission was working. Another cause can be because the torque converter has been pulled out of the pump too far in order to mate with the flex plate. It should only be pulled out by 3/8 of an inch max.