Aveiro Posted June 16, 2015 Share Posted June 16, 2015 (edited) What do you guys think of a Mdrive trans12 spd manual/auto vs Allison 6 spd auto?I have mack granites dump trucks with Allison 6 spd auto and i love it and so do the drivers, the downfall is the fuel consumption. The Mdrive trans should be better on fuel consumption being a 12 spd but is also very new on Granite trucks so i would like to hear from anybody has experienced this new trans. Edited June 16, 2015 by Aveiro 1 Quote Link to comment https://www.bigmacktrucks.com/topic/40498-mack-granites-mdrive-12-spd-manualauto-trans-vs-allison-auto-6-spd/ Share on other sites More sharing options...
Murf915 Posted June 16, 2015 Share Posted June 16, 2015 I have both in my fleet, the allison is a lot nicer of a transmission around the city and gets you off the line a lot better because it goes threw all 6 gears but like you said does go threw fuel pretty fast. The mdrive is nice but is sluggish off the line compared to the Allison but that's only because the mdrive will start in a higher gear if the truck senses it doesn't have a lot of weight on but if you do have weight it will go threw most of the gears, but on the highway the mdrive is nicer and doesn't run at a high rpm like the Allison but my truck with the Allison does have real high rear end gears Quote Link to comment https://www.bigmacktrucks.com/topic/40498-mack-granites-mdrive-12-spd-manualauto-trans-vs-allison-auto-6-spd/#findComment-293609 Share on other sites More sharing options...
rsb502 Posted June 17, 2015 Share Posted June 17, 2015 If you do a lot of off road or paving/milling work stick with the Allison, the clutch engagement at slow speeds is the downfall to the m-drive for vocational use, you cant lose with a torque converter. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/40498-mack-granites-mdrive-12-spd-manualauto-trans-vs-allison-auto-6-spd/#findComment-293729 Share on other sites More sharing options...
Hotshotrucking Posted March 28, 2016 Share Posted March 28, 2016 Just purchased the Granite tri-axle with the Mdrive, MP7 and will give you feedback as we go. I did read something about if the motor shuts off and the truck is moving it does damage to trany? Wondering if this is tru in neutral being towed? This truck will cut its teeth in the paver running in neutral with pto engaged and bed going up and down. Any advice would be great. Quote Link to comment https://www.bigmacktrucks.com/topic/40498-mack-granites-mdrive-12-spd-manualauto-trans-vs-allison-auto-6-spd/#findComment-328834 Share on other sites More sharing options...
fjh Posted March 28, 2016 Share Posted March 28, 2016 (edited) Rumor has it, is that ,Apparently if your towing you need to have at least 90 psi in the air system leave the key on and the trans in 3 gear Only rumor for me at this point! Others may chime in with better insite on the subject ! However Stick with Alice or standard if your Pebble packing or paving The M drive lends it self well to only a Road Trany in my opinion! Again MY opinion! Edited March 28, 2016 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/40498-mack-granites-mdrive-12-spd-manualauto-trans-vs-allison-auto-6-spd/#findComment-328848 Share on other sites More sharing options...
Mackpro Posted March 28, 2016 Share Posted March 28, 2016 Always pull the drive shaft if towing, Its a $15,000 mistake if you dont. We wont even push one into our shop if the engine wont run and the drive shaft is in , all it takes is 250 feet and your done. Quote Link to comment https://www.bigmacktrucks.com/topic/40498-mack-granites-mdrive-12-spd-manualauto-trans-vs-allison-auto-6-spd/#findComment-328866 Share on other sites More sharing options...
220cummins Posted April 8, 2016 Share Posted April 8, 2016 Quote Link to comment https://www.bigmacktrucks.com/topic/40498-mack-granites-mdrive-12-spd-manualauto-trans-vs-allison-auto-6-spd/#findComment-329836 Share on other sites More sharing options...
Jarhead Enterprises Posted April 9, 2016 Share Posted April 9, 2016 NEVER tow an M-Drive or I-Shift transmission without first completely removing the drive shaft - not even 2 feet. WE never do it - it will turn the insides of the transmission VERY ugly! If a wrecker company tows one into us we completely inspect to see the drive shaft has been removed before we accept the truck for repairs. I have 10 new 2017 GU713 on order for a customer with the M-Drive HD - they will be triaxle dump trucks delivered in June 2016 New 13 and 14 speed versions with deep reduction "lo-holes" of this transmission are scheduled to be out later this summer in the MP8 series first. Quote Jim Toussaint Division Operations Manager - Worldwide Equipment Inc Knoxville / Middlesboro / Crossville / Morristown / Asheville Highway Link to comment https://www.bigmacktrucks.com/topic/40498-mack-granites-mdrive-12-spd-manualauto-trans-vs-allison-auto-6-spd/#findComment-329901 Share on other sites More sharing options...
REEL ADDICTION Posted April 11, 2016 Share Posted April 11, 2016 I have an Allison in my triaxle and love it I don't really know much about the m drive but I do know u can't run a hydralic salter with the m drive Quote Link to comment https://www.bigmacktrucks.com/topic/40498-mack-granites-mdrive-12-spd-manualauto-trans-vs-allison-auto-6-spd/#findComment-330075 Share on other sites More sharing options...
MackTech Posted April 12, 2016 Share Posted April 12, 2016 You always have the Allison 4700 option too! It's a 7 speed (deep reduction first gear & a very deep reduction R1 -17:1 ratio) Quote Link to comment https://www.bigmacktrucks.com/topic/40498-mack-granites-mdrive-12-spd-manualauto-trans-vs-allison-auto-6-spd/#findComment-330156 Share on other sites More sharing options...
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