Propellor Dynamics lower unit changes for XB 21 Sportmasterx gear case

[twsykes]

Hi Guys,
Anyone had the propellor dynamics sport master gear case work done for the XB21? If so did you see improvement on top end and handling?

 

[Blueally XB21]

I had Propeller Dynamics do the Allison sportmaster mods on my 225X on XB21 2+2. It did help the handling and over all performance. Also, it helped the top end number a little bit (~1 MPH best I can recall). Note, I am running a 225X (2.5 liter) not a 3 liter engine. I can't comment on the differences with the 3 liters.

 

[twsykes]

Thanks

 

[JWolff]

Mine has those mods but never ran in stock mode so can’t compare.