roscoe69 Posted October 8, 2011 Share Posted October 8, 2011 ... I bought this B 421S; it has Mack Tetrapoid gears in the trans! pray tell, what exactly is the origin of this technological breakthrough? Sounds high performance and I'm proud to have em'.Ross Quote Link to comment Share on other sites More sharing options...
randyp Posted October 8, 2011 Share Posted October 8, 2011 I guess i need to get out more, but i dont even know what a "Tetrapoid" gear is. It sounds like I want one though. randyp Quote Link to comment Share on other sites More sharing options...
roscoe69 Posted October 8, 2011 Author Share Posted October 8, 2011 Yeah, I was laying on the ground pressure washing under the truck when I read the script on the trans. I said wow! tetrapoid? that's a new word for my vocabulary. I think I'm going to call into work on Monday and tell em' I can't come in because my "Tetrapoid" is acting up. Quote Link to comment Share on other sites More sharing options...
other dog Posted October 8, 2011 Share Posted October 8, 2011 I guess i need to get out more, but i dont even know what a "Tetrapoid" gear is. It sounds like I want one though. randypget up under Killer with a pressure washer, you might already have 'em. Quote Producer of poorly photo-chopped pictures since 1999. Link to comment Share on other sites More sharing options...
Rob Posted October 8, 2011 Share Posted October 8, 2011 get up under Killer with a pressure washer, you might already have 'em.That is what gets me going in the morning. I, (like most every Mack owner) suffer from an affliction known as "Tetrapoiditis"It is fairly easy to live with however with a good cup of coffee in the morning.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
vision386 Posted October 8, 2011 Share Posted October 8, 2011 A good liberal dose of Preparation-H cleared my tetrapoid problem right up!..............Mark Quote Mack Truck literate. Computer illiterate. Link to comment Share on other sites More sharing options...
randyp Posted October 8, 2011 Share Posted October 8, 2011 I think I will go play with my tetrapoid a while,,,,,,,,randyp Quote Link to comment Share on other sites More sharing options...
hatcity Posted October 8, 2011 Share Posted October 8, 2011 I think I will go play with my tetrapoid a while,,,,,,,,randypCareful-3 or 4 times a day is excessive Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment Share on other sites More sharing options...
other dog Posted October 8, 2011 Share Posted October 8, 2011 Careful-3 or 4 times a day is excessive...I haven't done that since I was a teenager... Quote Producer of poorly photo-chopped pictures since 1999. Link to comment Share on other sites More sharing options...
Rob Posted October 8, 2011 Share Posted October 8, 2011 ...I haven't done that since I was a teenager...I remember when I had one to play with; several Mack trucks ago....... Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
kscarbel Posted June 18, 2012 Share Posted June 18, 2012 (edited) Mack transmissions feature "Tetrapoid gears" which are stronger, longer-lived and quieter than those of conventionaldesign (as well as invalute transmission-shaft splines for greater stamina). Edited June 18, 2012 by kscarbel Quote Link to comment Share on other sites More sharing options...
bullhusk Posted June 20, 2012 Share Posted June 20, 2012 Mack transmissions feature "Tetrapoid gears" which are stronger, longer-lived and quieter than those of conventionaldesign (as well as invalute transmission-shaft splines for greater stamina).HEY JUST ONE MINUTE HERE!! That was one of the first things I told my wife about myself just before I married her !BULLHUSK 1 Quote Link to comment Share on other sites More sharing options...
JumperAndSon Posted June 20, 2012 Share Posted June 20, 2012 Seriously though, what is up with this whole "Tetrapoid Gears" thing? There's a casting on the side of our Duplex that says that. I've always wondered what it means.Ben Quote Link to comment Share on other sites More sharing options...
gvam Posted June 20, 2012 Share Posted June 20, 2012 I believe it has to do with the geometric shape of the gears. I think I have a much more technical explanation in one of the manuals I have. Let me see if I can find it. Quote Link to comment Share on other sites More sharing options...
lucerne tractor Posted June 20, 2012 Share Posted June 20, 2012 Sit ups are good for your tetrapoids. Something I need to work on, but just sayin'. Quote Link to comment Share on other sites More sharing options...
Freightrain Posted June 20, 2012 Share Posted June 20, 2012 With gears, it's all about the transmission of power with little power loss and noise. Straight cut teeth are strong, but whine pretty bad at speed. Helical cut gears are quiet, but aren't as efficient or strong. You need to be somewhere in the middle. I guess that is where Mack came up with their version. Little mix of everything. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
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