Jocko Posted August 16, 2010 Share Posted August 16, 2010 hi guys my b-61 has a duplex, i was thinking of putting in a quad box,how hard is it to find one,and how much do you guys think it will cost,also will i have to do any driveline work to make it fit,thanks Quote Link to comment https://www.bigmacktrucks.com/topic/15298-quad-box-trans/ Share on other sites More sharing options...
joes mack Posted August 16, 2010 Share Posted August 16, 2010 it will bolt up with the flywheel housing and the trans mounts but i dont know about the driveline work the quad box is a long trans. if you are close enough to eastern ky that shiping wouldnt kill you i have 2 that i would sell 1 for parts it has a chiped tooth on the big gear in the back of the main box and needs a bearing kit. the other one is still in the truck it workes good but has a whine in high split 5th thats loud it might need bearings in the back box. im going to put a 6speed in my truck because i have to hire a driver for it and not many people knows how to drive a quad box any more. plus the 6speed will handle the tork better than the quad for what im doing with the truck. joe Quote Link to comment https://www.bigmacktrucks.com/topic/15298-quad-box-trans/#findComment-61711 Share on other sites More sharing options...
Jocko Posted August 16, 2010 Author Share Posted August 16, 2010 ok before i jump into buying,i have to know if it will fit i'll get back to you Quote Link to comment https://www.bigmacktrucks.com/topic/15298-quad-box-trans/#findComment-61713 Share on other sites More sharing options...
HK Trucking Posted August 16, 2010 Share Posted August 16, 2010 It'll fit, you'll have to shorten the driveshaft because the back box on a quadruplex is a lot longer than the duplex.Also, make sure what type of clutch is in your truck. In a B model it will have either a push type single disc clutch, or a push type double disc clutch, you have to find a quad box with the correct bellhousing, input shaft etc to work with the type of clutch you have.Regarding the trans from Joe's Mack, I'm not sure what year his DM600 is, but unless it's a very early one, the DM's usually had the pull type double disc clutch setup.You could possibly mix & match parts from the front of your Duplex main box to make it work if it's set up for a different type of clutch than yours, or change your clutch & flywheel to match, but if you go from single to double disc you'll have to redrill the frame to move the trans mounts about an inch, and also if you go to a pull type clutch in your B model, you'll have to re engineer the clutch linkage to pull instead of push on the throwout bearing.Edit: I see Joe's Mack DM is a 1969, so that would almost certainly have the pull type double disc clutch. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/15298-quad-box-trans/#findComment-61727 Share on other sites More sharing options...
GreenGiant2 Posted August 16, 2010 Share Posted August 16, 2010 hi guys my b-61 has a duplex, i was thinking of putting in a quad box,how hard is it to find one,and how much do you guys think it will cost,also will i have to do any driveline work to make it fit,thankshey i have one in a 71 dm 600 that i am scrapping, if you want it let me know soon.gg2 Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment https://www.bigmacktrucks.com/topic/15298-quad-box-trans/#findComment-61746 Share on other sites More sharing options...
fordguyhey Posted August 17, 2010 Share Posted August 17, 2010 Does the trans in your DM have a double disc pull clutch or single push clutch? Also, do you know what model the trans is? (numbers on the side of the case?)-Ryan Quote Link to comment https://www.bigmacktrucks.com/topic/15298-quad-box-trans/#findComment-61805 Share on other sites More sharing options...
joes mack Posted August 19, 2010 Share Posted August 19, 2010 the 2 that i have are dual disc pull type and the trans are both 7220's ...joe Quote Link to comment https://www.bigmacktrucks.com/topic/15298-quad-box-trans/#findComment-61931 Share on other sites More sharing options...
fordguyhey Posted August 22, 2010 Share Posted August 22, 2010 That's the transmission I want to put in my truck. Right now I've got a TRQ7210 in my B75 but its single disc. I'm going to be making the truck tandem axle and putting in a 285 maxidyne so I'd really like to have a double disc clutch. Quote Link to comment https://www.bigmacktrucks.com/topic/15298-quad-box-trans/#findComment-62075 Share on other sites More sharing options...
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