Popular Post xdudebrahx Posted December 7, 2015 Popular Post Share Posted December 7, 2015 This is in a 77 Canadian R612. Shift pattern seems to be the standard H with the dog leg over and back towards your leg. Has R N L D on the air shifter. Also has a small lever next to the main box and I can't figure out what it's for. Doesn't even seem like it moves. Can't find a shift pattern sticker in it. Anyone venture to guess what the shift pattern is? 3 Quote Link to comment Share on other sites More sharing options...
Freightrain Posted December 7, 2015 Share Posted December 7, 2015 My guess air shift 6spd? The little lever likely a brownie box. Look under the truck for another transmission? If it didn't get used a lot, the linkage might just be gummed up. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
Popular Post 2stacksuperdog Posted December 7, 2015 Popular Post Share Posted December 7, 2015 Possibly the old style 12 speed that have a shifter for low low instead of air switch on dash 4 Quote Matt Link to comment Share on other sites More sharing options...
masterwelder Posted December 7, 2015 Share Posted December 7, 2015 That sure sounds like a Mack 12 to me. I think you use the small shift lever in reverse and L on the air shift as a deep reduction. Otherwise just normal shift 1st low/ high 2nd low/ high ect. I think... Quote Link to comment Share on other sites More sharing options...
Challenger Posted December 7, 2015 Share Posted December 7, 2015 If its a 12 speed the shifter towards the left is for deep reduction and will only move while the main shifter is in 1st gear. If you attach a picture of the trans from underneath the truck, some one can tell you what it is. 2 Quote Link to comment Share on other sites More sharing options...
xdudebrahx Posted December 7, 2015 Author Share Posted December 7, 2015 I'm home for the day. If I'm not busy tomorrow I'll see if I can snap a pic of underneath. I only got in it to take it over to the pressure washer. I've kind of "adopted" it and I'm trying to clean it up real nice. Hate seeing our old stuff get neglected. Quote Link to comment Share on other sites More sharing options...
Maddog13407 Posted December 7, 2015 Share Posted December 7, 2015 Oddball . Most 612s had a r1110 roadranger Quote Link to comment Share on other sites More sharing options...
cecilktm Posted December 8, 2015 Share Posted December 8, 2015 Looks like a 12 speed with the extended range on the extra stick instead of a dash switch (see shift pattern below). Also, looks like the truck has a Maxidyne 300 based on the air cleaner, assuming it's original. In lieu of the the typical 5 or 6 speed lo-hole, it's got to be the less common 12 speed paired with the Maxidyne. 1 Quote Link to comment Share on other sites More sharing options...
xdudebrahx Posted December 8, 2015 Author Share Posted December 8, 2015 Looks like a 12 speed with the extended range on the extra stick instead of a dash switch (see shift pattern below). Also, looks like the truck has a Maxidyne 300 based on the air cleaner, assuming it's original. In lieu of the the typical 5 or 6 speed lo-hole, it's got to be the less common 12 speed paired with the Maxidyne.Mack 12 speed shift patter.pngThanks! Exactly what I was looking for. Quote Link to comment Share on other sites More sharing options...
Vladislav Posted December 8, 2015 Share Posted December 8, 2015 Looks like a 12 speed with the extended range on the extra stick instead of a dash switch (see shift pattern below). Also, looks like the truck has a Maxidyne 300 based on the air cleaner, assuming it's original. In lieu of the the typical 5 or 6 speed lo-hole, it's got to be the less common 12 speed paired with the Maxidyne.Mack 12 speed shift patter.pngThe air cleaner seems as a typical Canadian one. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment Share on other sites More sharing options...
cecilktm Posted December 9, 2015 Share Posted December 9, 2015 The air cleaner seems as a typical Canadian one.I don't think the type of air cleaner has anything to do with the truck being Canadian or not. R model air cleaners with two air ducts coming out the front would be an indicator that the truck had a Maxidyne 285 or 300 with tip turbine / coolpower set-up. One air duct goes directly to the intake side of the turbo and the other goes directly to the cool air side of the heat exchanger. I haven't seen any other type of Mack engine using this type of dual duct air cleaner, but I also haven't spent too much time in Canada.I only mentioned this at all because it would have been a non-typical powertrain combination to have a 12 speed transmission mounted to a Maxidyne 300 engine. The high torque and long powerband of the Maxidyne did not need so many gear ratios, and the whole selling point of the engine was to cut down on the number of gear shifts needed when accelerating or decelerating.If in fact Canadian R models had two air ducts coming out of the air cleaner for some other reason, then I'd be interested in understanding why. Quote Link to comment Share on other sites More sharing options...
Underdog Posted December 9, 2015 Share Posted December 9, 2015 I've seen some in colder climate have an air cleaner with an intake tube routed from under the hood, to draw warmer, drier air. That appears to be the set up on this truck.Sent from my XT1254 using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
39 Baby Mack Posted December 9, 2015 Share Posted December 9, 2015 I've seen some in colder climate have an air cleaner with an intake tube routed from under the hood, to draw warmer, drier air. That appears to be the set up on this truck.Sent from my XT1254 using TapatalkThe first R models had air cleaners like that, there was a cable to control under hood air or external air.RonSent from my SM-G900V using Tapatalk Quote Link to comment Share on other sites More sharing options...
39 Baby Mack Posted December 9, 2015 Share Posted December 9, 2015 I don't think the type of air cleaner has anything to do with the truck being Canadian or not. R model air cleaners with two air ducts coming out the front would be an indicator that the truck had a Maxidyne 285 or 300 with tip turbine / coolpower set-up. One air duct goes directly to the intake side of the turbo and the other goes directly to the cool air side of the heat exchanger. I haven't seen any other type of Mack engine using this type of dual duct air cleaner, but I also haven't spent too much time in Canada.I only mentioned this at all because it would have been a non-typical powertrain combination to have a 12 speed transmission mounted to a Maxidyne 300 engine. The high torque and long powerband of the Maxidyne did not need so many gear ratios, and the whole selling point of the engine was to cut down on the number of gear shifts needed when accelerating or decelerating.If in fact Canadian R models had two air ducts coming out of the air cleaner for some other reason, then I'd be interested in understanding why.This truck also has a hood scoop on it too. The scoop would be for the tip turbine fan. The second pipe on the air cleaner would more than likely be for under hood air supply in cold weather.RonSent from my SM-G900V using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
cecilktm Posted December 9, 2015 Share Posted December 9, 2015 I've seen some in colder climate have an air cleaner with an intake tube routed from under the hood, to draw warmer, drier air. That appears to be the set up on this truck.Sent from my XT1254 using TapatalkThanks Underdog. Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted December 9, 2015 Share Posted December 9, 2015 In cold weather you'd draw air from under the hood to warm the engine up quicker. Or in heavy fine snow you draw from engine compartment. 1 Quote Link to comment Share on other sites More sharing options...
xdudebrahx Posted December 9, 2015 Author Share Posted December 9, 2015 Would this truck have had a 7 speed in it with a lo-lo stick? Two low gears and 5 direct gears? Didn't get to mess with it yesterday and I had to take off today to get some teeth yanked out. Quote Link to comment Share on other sites More sharing options...
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