Heavy Duty 5 Pinion Rear Planetary - 5 pinions vs 4, stronger under load, hardened gears, made of powered metal Heavy Duty 5 Pinion Front Planetary - 5 pinions vs 4, stronger under load, hardened gears, made of powered metalīW is good as is Alto.Ģ9 Element Foreward Input Sprag - far better in HO applicationsġ3 Vane Pump Conversion Kit - extra fluid flow at higher RPMs, most NBS already have this so verify before purchasing. These are known to starve for oil at high RPM (over ~6200rpm) and can break like some cheap foreign made four pinion units. Heavy Duty Reaction Sun Gear Shell - limits cracking and splitting on bearing area Heavy Duty Reaction Carrier Shaft - eliminates need for thrust washers, works in conjunction with the Sun Gear Shell Not worth the cost in my opinion as oiling is better on the fours as well as more metal between each gear. A drum balanced to 9500rpm isn't going to help much as we'll never see those RPMs and who has broken a stock input shaft? Input Drum Reinforcement Kit - Comes with a larger clutch piston as well as a collar to prevent the drum from tearing from the input shaft. Heavy Duty Output Shaft - limits broken shafts on high RPM kickdowns. This is only if you plan to kick down back to 1st at very high RPM, get a larger stall with more shift extension to keep you at bay. There are hardened and forged ones out I've seen. I'd consider a hardened unit, forged is wasting cash to me.

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