Join Date: Aug 2006
Location: Greater Puget Sound Area
Re: When go to 6 planetary gear?
The FMX gear set isn't a true six pinion planet setup. It is a three gear double idler that reverses the direction of the ring gear. They use that instead of the two planet setup of the C4 (rather the C4 uses the one idler setup instead of the FMX dual idler). There is less flex in the single idler planet - they are VERY strong and will take 500HP easily inless you are using a big nitrous shot to get the 500HP.
The six planet units that are modified from the stock three planet parts are only marginally stronger because the carrier is weakened by installing the extra gears, There is a forged 4 planet unit made (TCI?) that is a lot stronger than either of the others for C4s that have to take 800+ hp.
66 Mustang Coupe. 365hp, 4spd Toploader, sub-frame connectors
Shelby drop, suspension tuned for slalom and hill climb
body mods and weight reduced to 2000lbs; name: Muskrat