I'm running a diaphragm (Mustang) clutch that during the summer started to slip slightly when under heavy load. This clutch and related parts has only about 5,000 miles on it installed in a 64 F100 with T5 trans and Mummert flywheel.  In another thread I asked for recommendations from other folks running similar clutches and there were a couple reply's favoring the Centerforce dual friction clutch.  I would like to share what I found after pulling the trans and clutch. All the grease in the throw out bearing melted out and of course was flung around. The grease the manufacturer used looked like petroleum jelly. Bearing part number 1625-11 made in Mexico. On another forum I found similar complaints with the same bearing. I since found and ordered a new throw out bearing from a different manufacturer and still plan on installing a new clutch since the present one is contaminated.  We'll wait and see what the new bearing looks like.


64F100 57FAIRLANE500

I haven't found one yet that doesn't have to fling grease out at higher RPM. I have never had the grease affect the clutch operation yet though. 

  Vic Correnti

I think (hope) this is an isolated case. I believe the "runny" grease issue is due to the manufacturers poor choice of lubricant. If the new bearing appears to have the petroleum jelly grease, I'll clean it all out and add my own. I think the black moly wheel bearing grease would be the best choice for this application, used sparingly, IMO..


64F100 57FAIRLANE500