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03' Big Red

Porch Pup
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Everything posted by 03' Big Red

  1. Can someone attach a link for the K&S shop ? I’d like to talk to them but not sure of the location of the shop.
  2. Ok I’ll ask this question another way, can a E7 be turned into a EM7 ? what would have to be changed ?
  3. 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.
  4. 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
  5. 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
  6. so what is different on the EM7 ? is it in the pump or are other things involved ?
  7. 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.
  8. 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
  9. 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
  10. 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 ?
  11. 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.
  12. 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.
  13. 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.
  14. 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.
  15. 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
  16. Is that HT754CR going to hold up to a E9 ? I thought the torque rating was much lower than the 750DRD Am I correct the 1st gear ratio is 8.0 ? Or something like that on the 754 my truck has the AMI 370 and I would be pushing the torque limits. It’s around 1480 ftlb
  17. Ok folks i am still working on the details of this swap, I have a vin From a 2000 rd with a Allison, can anyone tell me which Allison this unit has and 1st gear ratio and also the axle ratio ? Vin 054124 also talked to another Mack tech and he says all that’s needed for the engine computer is to change the top gear ratio and change it to A designation for the automatic.. i would appreciate any other input in this swap, I plan to use to 750DRD for simplicity I also need to know what bell housing,flexplate and mounts to use.
  18. Did I say 1300 rpm ? My bad, it’s more like 1500 rpm, I am still considering the manifold and turbo ..
  19. I have not as of yet, just hit the 90,000 ish mark on a in frame, the engine really loosened up and runs excellent, I can shift at 1300 rpm now and it has the power to keep pulling, until recently I had to rev to 1800 or so. This is a tri axle, the gross weight here in PA is 73280 lbs
  20. The AMI has a much better rpm range 1200-2150 rpm and the torque rise is considerably more maybe 40-50% thats just a guess since I don’t recall exactly what it is... the AMI should out run the E7
  21. I would really like to keep this truck since I know what I have and to find a RD with a automatic set up like I need is fairly difficult. i did find a 2003 RD on the internet with a Allison VIN # 1M2P296C23M066900 this should help me create a parts list if I can’t find a suitable donor truck, my guess sticking with a RD would be my best bet for a donor truck.
  22. Thanks for the info, I did find a RD single axle that would work much better.
  23. I talked to my local Mack dealer, they contacted Mack engineering who wouldn’t release any info. i did find several 2001 LE donor chassis with the 4500 series trans, would the mounts and such from the LE work in my RD ? i would appreciate any information in regard to what I may have to change in my ECM, and if any changes are needed can a competent shop make those changes? Or would I have to find a dealership that would make things happen?
  24. I want to swap in a Allison 750DRD in my 2003 RD688S i run the Eaton 8LL now... no computer on trans my question is how will my ECM be effected ? amd what year donor chassis would work to get all the pieces needed? i am looking at a MR for the donor chassis
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