31 spline is still a bit on the weak side. I just tore mine up at the 700 horse level after one season and stepped up to a 35 spline setup from Dutchman. Fully assembled with a gear set, axles, carrier, shortened and backbraced tube and maybe a spool expect to spend up to about $2000.00 to $2500.00 Would definitely need a backbrace on the tube, and a good nodular carrier. Never heard of a 37 spline...35 or 40 maybe. I would also be very concerned about the chassis at that level, and how to plant that much power. Back halving the car, ladder bars, subframes, 10 point to stiffen the body.
Ron
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