Bigdogtrucker Posted November 3, 2014 Share Posted November 3, 2014 Friend of mine got a job driving a late ''80's R model dump with one.Says he's having trouble getting the hang of it coming from Road Rangers.What's the purpose of them compared to the 6spd? Quote Link to comment Share on other sites More sharing options...
terry Posted November 4, 2014 Share Posted November 4, 2014 Biggest problem I have seen is guy's trying to use the low range selector as a splitter, does not work that way ! Quote Link to comment Share on other sites More sharing options...
Green Dash Posted November 4, 2014 Share Posted November 4, 2014 It looks like it has an additional ratio available on the low side compared to a 6 speed.http://public.fotki.com/modeltrucks25thscale/truck_brochures/mack/mack_spec_sheets/mack_transmissions/tra0281_1.html#media Quote Jim Link to comment Share on other sites More sharing options...
Bigdogtrucker Posted November 4, 2014 Author Share Posted November 4, 2014 5th has a very tall OD also correct?They want to put a different trans in,but i'm pretty sure these 7spd trucks have steep rear gears.I plan to take it for a spin one of these days to see how it shifts,i don't think they understand the basic concept how these engine/trans work with their wide power band. 1 Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted November 4, 2014 Share Posted November 4, 2014 7spd extended range? If I remember there's like 1000 rpm drop between gears. We used to have one with a 300 4v and always ran 85,000 pounds. Gotta let her lug though Quote Link to comment Share on other sites More sharing options...
57 bcr Posted November 4, 2014 Share Posted November 4, 2014 Had a '90 RD with a EM-6 300L/2070 in it.Had 5.55 rears in it because the 2050,2060,2070,&2080 all had a .60:1 OD in them. Had a 70mph top end with the 5.55's in it,and was a sweetheart off the road with a 14.16 crawler in it! Ordered it with the 2060 in it,but it wasn't low enough to get restarted in soft ground.My local MACK garage changed it to a 2070 for me,and that was the answer. 1 Quote IF YOU BOUGHT IT, A TRUCK BROUGHT IT..AND WHEN YOU'RE DONE WITH IT, A TRUCK WILL HAUL IT AWAY!!! Big John Trimble,WRVA Link to comment Share on other sites More sharing options...
Maddog13407 Posted November 4, 2014 Share Posted November 4, 2014 guy up here in Ny had one in an RB tri axle and hated the damn truck so bad after he bought it cause of that 7 speed. Quote Link to comment Share on other sites More sharing options...
terry Posted November 4, 2014 Share Posted November 4, 2014 5th has a very tall OD also correct?They want to put a different trans in,but i'm pretty sure these 7spd trucks have steep rear gears.I plan to take it for a spin one of these days to see how it shifts,i don't think they understand the basic concept how these engine/trans work with their wide power band.If you change to a different trans. you will also have to change the rears. Quote Link to comment Share on other sites More sharing options...
xdudebrahx Posted November 4, 2014 Share Posted November 4, 2014 Wind it all the way out, jake shift it. That's the best way to get it moving.I hate the ones we have at work. I'd rather drive the two stick maxitorque.The ones we have at work will not float into 5th cleanly no matter where you shift it. That's the only gear I usethe clutch on. Quote Link to comment Share on other sites More sharing options...
xdudebrahx Posted November 4, 2014 Share Posted November 4, 2014 Here's a video of me driving all 7. (Click on it)http://s15.photobucket.com/user/Dan_Hero/media/2EAF1A18-106F-4370-9FEE-99EF0659E373.mp4.html Quote Link to comment Share on other sites More sharing options...
GreenGiant2 Posted November 4, 2014 Share Posted November 4, 2014 I can't run 70 mph. With my Dm. 2080. With 300 L and 4.56 rears. Think it's 65 max. Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment Share on other sites More sharing options...
Green Dash Posted November 5, 2014 Share Posted November 5, 2014 I drove a 5 speed CH with with 4.64 rears and I believe lo-pro 22" tires. It would run 65 at around 1475 rpm and at 1800 would have up in the high 70's. Quote Jim Link to comment Share on other sites More sharing options...
terry Posted November 5, 2014 Share Posted November 5, 2014 I can't run 70 mph. With my Dm. 2080. With 300 L and 4.56 rears. Think it's 65 max.Something is not right here, I have driven a RD with seven spd. and 5.55 rears, topped out right at 70 MPH. 1 Quote Link to comment Share on other sites More sharing options...
Popular Post 57 bcr Posted November 5, 2014 Popular Post Share Posted November 5, 2014 Matt,if the guy is someone that loves to shift a lot,the 2070 is not for him. After all,the EM6 IS a Maxidyne with time to enjoy a bite of your sammich and a sip of coffee between each gear! LOL! I guess you either love 'em or hate 'em. 3 Quote IF YOU BOUGHT IT, A TRUCK BROUGHT IT..AND WHEN YOU'RE DONE WITH IT, A TRUCK WILL HAUL IT AWAY!!! Big John Trimble,WRVA Link to comment Share on other sites More sharing options...
mackey58 Posted November 5, 2014 Share Posted November 5, 2014 thats right al the01 rd we had .had the 300 with the seven speed it was great for off road and on road not fast but slow and steady wins the race 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Maddog13407 Posted November 6, 2014 Popular Post Share Posted November 6, 2014 I thought every Mack transmission you were suppose to have a sammich and sip of coffee between gears?? 3 Quote Link to comment Share on other sites More sharing options...
Superdog Posted November 6, 2014 Share Posted November 6, 2014 I never drove a 2070,but there was an older 7 speed Maxitorque,I'm not sure what the number for it was,but it had the air splitter with reverse on the knob like a 6,10 and 12 speed,it was an overdrive transmission and you split the top 2 gears as I remember. it was a .78 od like the 10 and 12 speed.only drove one once,but I kinda liked it. Quote Link to comment Share on other sites More sharing options...
Popular Post mrsmackpaul Posted November 6, 2014 Popular Post Share Posted November 6, 2014 thats right al the01 rd we had .had the 300 with the seven speed it was great for off road and on road not fast but slow and steady wins the raceinteresting at least I think that at in the late 60's when Maxidynes first got released in Aussie land there was a road test between Melbourne and Sydney and although other brands of trucks would out run them on the flat and it felt to the person testing the Mack that it was a lot slower the driver who drove it all the time told the tester man dont worry we will round them up pretty soon over all trip time was quicker than any other truck the fuel was a lot less and what does all this have to do with a 7 speed maxi torque not much but it goes to show that just because it feels slower dont mean it is driven right these trucks will just about out perform any other truck on the market today in real terms as in the only thing that matters dollars in your pocket at the end of the dayPaul 3 Quote Link to comment Share on other sites More sharing options...
57 bcr Posted November 6, 2014 Share Posted November 6, 2014 Agreed,Paul! Mike,I remember that trans,but not the number of it either.I think it came out in the late '70'-early '80's? Thought it would be a mainstay in the MACK powertrain specs (after reading a test in one of the big fleet mags),as it seemed to be what a lot of guys were looking for,"one more gear"! Hmmmmm,wonder what the problem was with them? Quote IF YOU BOUGHT IT, A TRUCK BROUGHT IT..AND WHEN YOU'RE DONE WITH IT, A TRUCK WILL HAUL IT AWAY!!! Big John Trimble,WRVA Link to comment Share on other sites More sharing options...
Superdog Posted November 6, 2014 Share Posted November 6, 2014 Agreed,Paul! Mike,I remember that trans,but not the number of it either.I think it came out in the late '70'-early '80's? Thought it would be a mainstay in the MACK powertrain specs (after reading a test in one of the big fleet mags),as it seemed to be what a lot of guys were looking for,"one more gear"! Hmmmmm,wonder what the problem was with them?I thought it was a good deal too,guess more Mack guys were worried about pulling stumps than passing Petes 2 Quote Link to comment Share on other sites More sharing options...
b61mack Posted November 6, 2014 Share Posted November 6, 2014 The older 7 speeds were 1070G, I think the splitter knob had a lock out but without the lock you had a 10 speed. I have one of the older 1070G. Quote Link to comment Share on other sites More sharing options...
mackey58 Posted November 7, 2014 Share Posted November 7, 2014 Yea lol Quote Link to comment Share on other sites More sharing options...
57 bcr Posted November 7, 2014 Share Posted November 7, 2014 That's the one,Ron! The earlier 2070 used that same knob,but you still only had 2 reverse gears.The 2070B had 5 reverse gears like the older six speeds did. By time my truck was built,they had switched to what I call "the upside down golf club" shift knob. I thought I was getting the earlier one,but no such luck! Quote IF YOU BOUGHT IT, A TRUCK BROUGHT IT..AND WHEN YOU'RE DONE WITH IT, A TRUCK WILL HAUL IT AWAY!!! Big John Trimble,WRVA Link to comment Share on other sites More sharing options...
oldmacktrucks Posted February 16, 2015 Share Posted February 16, 2015 Start in low 1st, shift to low second...split to high, go back to 1st, then up shift normally... I love those transmissions! Quote Link to comment Share on other sites More sharing options...
oldmacktrucks Posted February 16, 2015 Share Posted February 16, 2015 Same splitter as a 12 speed but with the Allen screw turned in Quote Link to comment Share on other sites More sharing options...
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