[doverden]

Assume you have a ZF63?

How long has it been since fluid/filter change?  you'd be surprised how much gunk builds up.  Make sure its correct fluid.

Do u have a trolling valve?

Forward is ok?   check pressure with actual mechanical gauge too.  The VDO sending units can fail.

There is a manual override on the transmission too.  You can test the transmission that way to eliminate the electrical portion.

PM me.

John

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Thanks John for the response. A Hurst filter kit was installed in October of 2015 and fluid changed then. Not sure what a "trolling valve" is as it relates to my Tiara but there is nothing in any of my documentation that mentions it so I assume not. Forward is just fine and boat reaches full power and smoothly. I will have the other items checked out. Boat is currently hauled and will be put back in the water mid-January at which time the transmission will be tested.

Dennis