DodgeMan Posted May 15, 2013 Share Posted May 15, 2013 Is there any way of telling what kind of quad box is in the truck without taking it all apart??My B81 has a quad box in it but the stampings on the case say triplex?Single dobble over etc...Thanks Paul Quote Link to comment https://www.bigmacktrucks.com/topic/31192-quad-box/ Share on other sites More sharing options...
theakerstwo Posted May 15, 2013 Share Posted May 15, 2013 Thriplex with a quad rear box which was common thing in the day.So you can make up your on model #. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/31192-quad-box/#findComment-183520 Share on other sites More sharing options...
DodgeMan Posted May 17, 2013 Author Share Posted May 17, 2013 Its a 5 and a 4 just thought thers was a way looking at the outside of the cases you could tell if it was a od quad box or not Quote Link to comment https://www.bigmacktrucks.com/topic/31192-quad-box/#findComment-183680 Share on other sites More sharing options...
Superdog Posted May 17, 2013 Share Posted May 17, 2013 I have just the opposite on my B83,the main box is from a Quad,rear box from a Triplex.With the 4:17 rear ends it's geared way to hi for practical use. Quote Link to comment https://www.bigmacktrucks.com/topic/31192-quad-box/#findComment-183767 Share on other sites More sharing options...
Maddog13407 Posted May 18, 2013 Share Posted May 18, 2013 theres no real way to tell a 20 from and 18 speed quad just by lookin at them unless you took them apart and actually counted teeth.. if you have driven one for a few years you can tell right away which one is double over tho and which one isnt. i had a 10 speed duplex in my B613 before i took it out and out a triplex back in like it had original. the duplex box was cracked and brazed bad so we took all the gears out and out them in a double over quadbox case that had bad bearings. so if anyone looked at it they would be puzzled haha. lots of guys did this back in the day and switched cases or back boxes. sometimes it worked, sometimes it didnt. sometimes it was just to get the truck runnin again. i know a 9 speed duplex and an 18 speed front box might be the same cause they are both overdrive but i dont think you could interchange a direct duplex with an overdrive back box as 5th gear is different. Quote Link to comment https://www.bigmacktrucks.com/topic/31192-quad-box/#findComment-183895 Share on other sites More sharing options...
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