David, I've seen you mention "plastic gears" before but I can assure they are not and have NEVER been plastic. Take it from someone who has replaced &/or rebuilt hundreds of angle drives over the years. I still say the only way to make this inherently weak design last longer is harder gears, better lubrication, and tight tolerances on the gear-set via better quality control. Been there done that! The cause most often is that the shallow cut helical gears jamb up due to poor lubrication and even the slightest wear. I have examined many failed units and the gear-sets almost always show wear on the load bearing side of the smaller gear's teeth. I'll send you a few if you want to see it for yourself. The smaller gear then jams momentarily on the larger gear and "poof" goes either the short axle cable or it's interference fit in the larger gear (Of this I m sure). The answer is how best to control the wear or come up with a completely different design that won't "break the bank". I spoke to Stephen this morning about the failures on the new unit's (you can tell them from the originals because they use a grease fitting instead of an, shall we say, oil access screw to allow for re-lubrication. He said the factory blamed the problem on inconsistent fitment of the brass bushings the gears ride in. We're back to poor Q.C.! He did not know if the gears were harder but if the bushings aren’t a perfect fit the gears will jamb anyway. He further explained that all of the units are spun for about 15 minutes forwards and backwards on some sort of drill setup to weed out the most obvious ones with Q.C. problems. Personally I have seen about a 10% failure rate on the new units my shop has sold within the last year which is higher than my HCR units after three years so obviously there is room for improvement using the methods I've already indicated. The next step is to have the FACTORY incorporate similar methods so I won't, or you, have to spend countless hours stuffing tiny little gears into teeny little gearboxes with handmade pressed in cables! I'm tired of it and can think of better ways to make a living such as restoring DeLorean's instead of angle drives. If I have to however I will... but I think we should give the factory ONE more chance to get it right as I'd hate to see another thousand lot batch of angle drives with the same problem. I'm going to start by taking the next failed new angle drive apart and checking the tolerances and send the gears out for hardness testing. I'll report my findings to Stephan and see if we can get the longevity of this lousy design into at least the forty to fifty thousand mile range. I believe in many cases I achieved this with the HCR units (Stands for "Hard core rebuilt" for those who would pose the question) using the methods I already suggested. I'll update you when I have more to offer. Rob Grady P.J.Grady Inc. -----Original Message----- From: David Teitelbaum Subject: [DML] Re: Grady's, HRC Angle drive I wonder just how much "hardness" plays a role in the longevity of the gearset. In many instances of gearsets one gear is purposly made softer than another so that you only replace 1 gear instead of 2. In any case there are many origional angle drives out there still operating with plastic gears. To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/