ozzymack Posted November 23, 2010 Share Posted November 23, 2010 Hi, Im new to Macks and new to the forum. I bought a 1973 R model tandem dump with a 300 in it. It has 2 sticks in it. My problem is that i dont know the shifting pattern? I was told it was 5 speed with Hi, Lo and Rev on the second stick. Can anyone tell me what the pattern is? I have searched the forums but couldn't find exactly what I was looking for. Thanks Quote Link to comment Share on other sites More sharing options...
ozzymack Posted November 23, 2010 Author Share Posted November 23, 2010 (edited) There is no Shift plate in the truck and there are Billiard Balls on the ends of the sticks.I think 1 is left and down, then a standard 5 speed. the second stick I think is R left and up, direct right and down and Low up and right?Does that sound right? Edited November 23, 2010 by detroit671 Quote Link to comment Share on other sites More sharing options...
other dog Posted November 23, 2010 Share Posted November 23, 2010 sounds like a 6 speed to me,but i'm not too much up to snuff on the later model mack transmissions myself.As a matter of fact i'm not really up to snuff on anything. If it is a 6 speed,you just shift the one stick from low to hi with the main in first when you start off,then shift the other one on up to 5th.And from what I understand,you can also back up 40 mph...if you want to. Quote Producer of poorly photo-chopped pictures since 1999. Link to comment Share on other sites More sharing options...
snorky36 Posted November 23, 2010 Share Posted November 23, 2010 You have a 6 speed the main is the standard 5 speed pattern. The aux has rev in the foward left position wich you can shift the main to any gear that you can handle. Low is foward and right should be used in first gear when in tuff sledding but we would use it if we were turning around and had to go back and forth with the main in 2ed or 3ed try it you will understand. High is back and right. When on road all you shift is the main rpm range is 1200 to 2100 Good luck Quote Link to comment Share on other sites More sharing options...
ozzymack Posted November 24, 2010 Author Share Posted November 24, 2010 Thanks, It finally makes sense to me. I've been reading posts all day. This is my first Mack and I am trying to get it road ready before the snow flies. I will keep you updated and post some pics. Thanks Quote Link to comment Share on other sites More sharing options...
rhasler Posted November 24, 2010 Share Posted November 24, 2010 Look in the wiki for the R, and U operators manual that Barry posted there. It has a diagram of the shift patterns for various transmissions and quite a bit of other information that would apply to your truck. Here's the link:http://www.bigmacktrucks.com/index.php?app=tutorials&article=25 Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment Share on other sites More sharing options...
ozzymack Posted November 25, 2010 Author Share Posted November 25, 2010 Wow, That manual is just what I needed! Thanks a million!And especially Barry for making it available. Thanks Quote Link to comment Share on other sites More sharing options...
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