03' Big Red
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Everything posted by 03' Big Red
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I guess I’ll give it a good drive and see how it rides sounds like the best bet is to swap out the whole thing, and yes it has the 5” wide springs versus 4” for the 44 & 46
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i am buying a truck with 58,000lb rears but would like to go down in weight rating in the spring to get a nicer ride. will the 58,000 lb differentials fit into a 46,000 lb housing ? i am looking into swapping in a Haulmaxx cutoff but in the interest of saving money would prefer to keep the differentials and transfer them over.
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that's my thought especially if its governed at 1750
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hey gang, i am looking to purchase another truck . it is a 1992 DM that has a EM 7 300,Eaton 8LL and 5.73 axle ratio, i thought EM 7's are governed at 1750 rpm, the seller states peak torque is around 1700 rpm and it will pull up to 2100. am i wrong ?
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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. -
Ok I’ll ask this question another way, can a E7 be turned into a EM7 ? what would have to be changed ?
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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.
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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
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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
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so what is different on the EM7 ? is it in the pump or are other things involved ?
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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.
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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
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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
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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 ?
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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.
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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.
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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.
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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.
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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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Allison Automatics
03' Big Red replied to granitefan713's topic in Modern Mack Truck General Discussion
What was the axle ratio on your truck ? -
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
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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.
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Did I say 1300 rpm ? My bad, it’s more like 1500 rpm, I am still considering the manifold and turbo ..
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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
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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
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