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03' Big Red

Porch Pup
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About 03' Big Red

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    Old Iron Expert
  • Birthday September 24


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  1. What would the proper offset rim be to run a 425 22.5 steer on the front of a 98 RD 688SX ? the truck has Dayton 6 spoke hubs
  2. UPDATE... the 58,000 lb rides almost as nice as the 44000 lb in my 03 RD but much nicer with a load and running of road ! who woulda thought !!
  3. Problem solved, we had to replace the VECM for other reasons and that solved the speedometer issue as well as the intermittent failure of the right turn signal.
  4. They can’t help as it’s a Mack part installed by Mack when the truck was built
  5. I have a 98 Mack RD688SX last part of vin is 040210 with a Allison 4560 i need a speed sensor, it screws into the LEFT side of tail housing The Mack P/N is 64MT-355M It is specific to 98-2000 Mack RD w/Allison im hopeful that someone has a new or used one they can sell me as Mack says it’s obsolete
  6. i have heard different, i was told they wont transfer over by a certain Mack specialized salvage yard...i am hopeful KT_Engineer is correct. that would surely make things much easier
  7. 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
  8. 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.
  9. that's my thought especially if its governed at 1750
  10. 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 ?
  11. 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.
  12. Ok I’ll ask this question another way, can a E7 be turned into a EM7 ? what would have to be changed ?
  13. 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.
  14. 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
  15. 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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