We put about 2000hrs on the DPH-B 1:63 powered with a single 370hp and spun a top bearing, this drive was sent out to Indemand every year for a go thru. On one of regular oil changes we notice grey glittery oil! we put a 1:69 DPH-C on. THe other boat has a DPH-b 1:96 powered by a single D4 225 and after the guys at indemand went thru it they say it has pitting in gears and can go any hour and recommend a replacement. I would rather have identical drives to swap back and forth from boat to baot as needed. We put the DPHC we had here on the D4 and tried G6 props on and it couldnt reverse of the trailer, we then put the smallest props volvo makes on G2 and it worked! 3600 plus RPMS at 31 knots(loss of 4 knots) but at cruise 3000rpms 25knts and 6gals hr, 2500rpms 18knts at 4.5 gal hr. Today we will put the G3s on and see what happens.