T350 Manual Transmission (Service Information): Description: Description: Lubricant/Additives

Hypoid gear lube or engine oil should not be used in this transaxle.  Hard shifting effort, bearing, gear, and/or synchronizer failure may occur if incorrect fluid is used.

The addition of any fluids to the transaxle, other than the fluid listed above, is not recommended. An exception to this policy is the use of special dyes to aid in detecting fluid leaks. The use of transmission sealers should be avoided, since they may adversely affect seals and synchronizers.