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About jkruss82

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    Truck Nut

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    Central PA
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    Engineer for the best truck in the world

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  1. 200 rpms is either direction when splitting. If at 1600 revs you want to split down: hit the button down, then you need to tap the throttle, let off to break torque, then throttle up to 1800. I'd say that 1600 is a little high to be down splitting, but can't say for sure what you are trying to do.
  2. Pretty big undertaking. Special transmission wire harness, and engine wire harnesses needed. Does the donor chassis have the same engine type as your RD, then maybe you could just pull the donor ECM. Not sure about component shop flashing new software. Flywheel housing should be the same, but flywheel needs swapped out and you need the spacer ring. Allisons are very heavy and require rear buggy spring mounts at the rear of the transmission, so you probably need to fabricate brackets on your frame. I'm not familiar with where the RD rear engine mounts are located (Flywheel Housing or Side of transmission) in either case they will not likely be the same. There would probably be more headaches along the way, that I'm not thinking of. Hate to say this, but I'd recommend trading your truck to get the transmission you want. Pic of buggy spring
  3. Its a 425HP engine. 338 may be the hp at 2100 RPM, but max hp is around 1600-1700 RPM.
  4. Forward 6+2 1 2 3 4 5 6 7 8 17.77 10.94 6.57 4.05 2.54 1.57 1.00 0.71 Reverse 15.59 9.60 6.02 3.73 2.37 1.69
  5. You can probably make this work as long as you pay close attention to plumbing the correct air and oil lines. You will also need to be careful with driveshaft angles, since the input and output shafts have a pretty large offset. Also there were lots of different HI and LO ratios available on these units. for example TC15 LO-2.59 HI-1.00 and TC25 LO-2.59 HI-1.36 Good luck if you try this.
  6. Recommend checking air pressure on both sides of the shift cylinder and shift between Hi and Lo, and do this with a warm transmission if possible. Its possibly you just need some seals I've generally heard that the shifting gets better on a warm trans, but in your case the opposite could possibly be true.
  7. If its the splitter, its the top cover on the back box that possibly needs to have the air cylinder rebuilt (new o-rings, maybe new brass air fittings) and check the air lines and other fittings on top of the transmission.
  8. Unfortunately Australia tightened up their noise regulations and Mack dropped their manuals from being offered about 6 years ago. I think you may be able to special request one, but I would hate to know the cost. In the USA Mack sells mDrive, Allison, Eaton, and Mack T300. About 20% of trucks still have a stick, the other 80% do not and that number continues to grow.
  9. The Mack 6 speed is gone from production. It was nice and lightweight for a class 8 truck, but drive-ability and reliability not so great. Mack's manual transmission take rate is about 10% of new trucks. Mack has the most PTO options available and a 10 speeed multi-speed reverse (T310M) that is shiftable through 6 reverse gears. Otherwise Mack and Eaton match up pretty close with 9/10/13/18 speeds.
  10. it may be for flywheel PTO New Picture.bmp
  11. Sounds like it may need new seals and o-rings if the air lines are all still connected properly.
  12. Whats wrong with the Mack 13spd if you don't mind me asking? For the Eaton you can use either aluminum or cast iron bell housing with the correct clutch release. You will probably need a longer prop shaft as well.
  13. Do you mean shaft? Dig those swivel clips out with a flathead screwdriver and punch the pin through.
  14. The pilot bearing floats in the flywheel, nothing holds the new ones without snap rings. Good idea to replace the pilot bearing, they tend to go bad from the clutch dust and such.
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