redoing transom and want to know what is involved in rasing the x is it possible with trs

To raise the X basically you would have to cut the hole higher and raise the motor mounts. Wheather or not you can do it depends on the boat your wanting to do this to. Is there clearance inside to raise the transom plate and if your exhaust goes through the transom can they be raised higher?

i have about 6inches of clearance under engine hatch and exhaust can go up about 4 inches will i see any increase in speed also how much would be a good height to raise it bottom of v to prop shaft?

what kind of boat? if you are redoing the transom, it is a good time to think about cutting smaller holes and putting bravos in it.

Simplest change over from the TRS is Konrads. Your gonna screw up the whole balance of the boat. Even switching over to Bravos you'll have to relocate the engines towards the rear when you eliminate the transmissions. Beside I don't think a Bravo is a strong as a TRS but the Konrads are made to swap out them IMO.

its a donzi want to keep trs
would raising x 1.5 inches gain any speed

If you were to swap to a Konrad drive, the standard length Konrad is 1.7" shorter than the TRS. Konrad also offers a shorty lower (-1.75") that could bring your propshaft height up about 3.5" with just a bolt-on.

We typically see a 3-5 mph increase in speed with the standard length swap.

Donzi didn't just throw the engine in anywhere it'll fit. how far below keel is your prop now? what Donzi? what year? what power

22 454 3inches

That sounds way high for a TRS application. Did you measure to the center of the prop shaft (or bullet of the case) as in the pic below?