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03' Big Red

Porch Pup
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About 03' Big Red

  • Rank
    Old Iron Expert
  • Birthday September 24

Profile Information

  • Gender
    Male
  • Location
    Pennsylvania

Previous Fields

  • Make
    Mack
  • Model
    RD688s
  • Year
    2003

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  1. Ok I’ll ask this question another way, can a E7 be turned into a EM7 ? what would have to be changed ?
  2. i like that the EM 7 has peak torque way down at 1020 rpm, if my AMI made torque that low it would a game changer.
  3. it seems the differences are in the pump,turbo and injectors on a mechanical EM7 300. I'm not completely sold on the Mack trans over the Eaton, although I have never run the newer Mack trans, only the ones found in a 83 R model. i don't want to lose the ease of shifting and the gear spread i have in my 8LL, maybe i just need educated but from what i hear the T2080 type trans has big jumps between gears especially going into OD, that seems like one could get fatigued after a long day on the job. i would appreciate someone who has real world experience driving one of these to educate me
  4. i am talking about a mechanical EM 7 300 seems a Eaton 8LL amd 4:42 axle ratio would be a great set up, i see how well that set up works with my AMI 370, that's rated at 1480 ftbl @1300 rpm
  5. so what is different on the EM7 ? is it in the pump or are other things involved ?
  6. here is a hypothetical question, can a E7 be turned into a EM7 ? also what is the highest HP rating for the EM7 ? seems to me ive seen a 350 hp listed some place. seems if one had the right transmission and axle ratio the EM7 would be quite a sweet set up. My AMI 370 runs just wonderful but i like the idea of the EM7 max torque way down at 1025 rpm versus 1250 of the AMI i understand that the EM7 is governed at 1750 rpm and the AMI at 2150 rpm but honestly most times i can shift at 1700-1750 i am typically loaded around 72,000-73,000 lbs in a dump truck.
  7. no idea, its listed as a 6 speed Maxitourqe that and the 1997 model year is the only info I have right now. I am confused with the 4:42 axle ratio, I thought the mack trans had a .60 OD and typically used a 6:00 or lower axle ratio
  8. I am looking at a 1997 Mack DM with a 6 speed maxitorque transmission, its a ready mix chassis with 4:42 axle ratio can someone tell me what ratios this transmission would have, I've searched the internet briefly and haven't found the info. I am most curios about 1st gear and 6th gear ratio. thanks in advance for any info
  9. i have a question about the Mack air ride used in dump trucks, i saw a AL461 suspension rated at 46,000lbs, is this a true Mack suspension ? I have heard they are built by Hendrickson and it looks like the Primaxx does this suspension offer the stability and articulation like the Primaxx ?
  10. the big issue i find now is price, I have been told $25000-$30000 by two different shops, i don't understand how that could be possible, especially if i find a donor truck. i should be able to find a single axle RD with a E-Tech and Allison for a fair price.
  11. the 750 drd has a much lower 1st gear than the 4000 unless you jump up to the 4700, if i go with the 4000 series then i'll need a computer and harness and the cost is much more. i dont want to get into that, i want to keep it simple.
  12. thanks for the info, i run a 4:42 so my top speed will be about 55mph or so at 1900, not so bad since my work is mostly within 30 minutes and in a 55 MPH work zone. i have finally got a contact who did this swap a few times on a Mack and they are able to answer all my questions about flywheel housing,flexplates and tooth counts to keep the E tech happy.
  13. What axle ratio does your truck have ? Also does your trans have a rear support? I know the 4000 series requires one. i know that I need to pay close attention to tooth count on flex plate and tone ring/ speedometer gear to make things work.
  14. I have a few questions about parts interchangeably, will a Allison 700 series bolt up to a 4000 series flywheel housing and flex plate? is a spacer needed ? If so what p/n ? also what is the tooth count on the 700 series speedometer? My Final question, will the output shaft yoke from a 4000 series fit a 700 series this is for a conversion project in a 03 Mack RD688s that currently runs a Eaton 8LL
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