I believe it is. The cross shaft wouldn't come out of my 489 case 3.23 without removing the R&P and I was kinda bummed.
From their website:
NOTE: This is a brief description of the installation instructions and is not to be used for actual assembly. A detailed owners and installation manual come with every Lock-Right kit. Vehicles that have low gear ratio’s (numerically high) can often require a more extensive installation because of the ring gear thickness.
