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Everything posted by jkruss82

  1. 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
  2. Its a 425HP engine. 338 may be the hp at 2100 RPM, but max hp is around 1600-1700 RPM.
  3. 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
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. it may be for flywheel PTO New Picture.bmp
  10. Sounds like it may need new seals and o-rings if the air lines are all still connected properly.
  11. 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.
  12. Do you mean shaft? Dig those swivel clips out with a flathead screwdriver and punch the pin through.
  13. 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.
  14. Is this a new transmission or does it have a many miles? Sometimes a gear will have a bad spot and sound like a knocking during coast. If you have a T310 and its in low speed, the gear set directly behind the mainbox (in the rear box) is most likely the culprit of the knocking noise. That being said this noise may go away after the bad spot gets worn down, but that's only if this is a new or Reman new transmission.
  15. If your MP8 is rated at 1860 ft-lbs you'll need a VCT+ clutch rated at 1860 or higher. The Mack 9-spring will be getting a rating increase in April of 2017 to match the 1860 ft-lb engine rating but Eaton will not warranty the current 9-spring at 1860. your correct about the springs in the disc dampening the chatter and shock from the crankshaft.
  16. Rear section countershaft gears are welded on the shaft . That would take some effort. Not sure how you could change around any other top two gears???
  17. If it sounds like its coming from the transmission then it may be the reverse gear set in the back box. In 7th and 8th the reverse gear set is spinning fast and is not loaded so it may sound like a lot of rattling.
  18. If the offered 6 speed is a T2060 then it has an air shifted hole gear. The ratio is 9.02:1 which is much deeper than your 5-speed with a 5.24:1. To install you will need to cut down a drive shaft because the transmission is about 8 inches longer and you will need a shift knob with toggle switch. If the 6 speed is a T306G, it will have a 1st gear ratio of 7.5:1. It would fit the same as your 5-speed and should be a simple swap out.
  19. What kind of noise is it? You may need a new overdrive gear on the main shaft, especially if the unit ran low on oil for a length of time.
  20. Lots of oils acceptable, see attached list of Engine and Transmission approved oils. Best not to use additives. Mack approved oils.pdf
  21. There may not be rebuild kits, but O-rings and seals should still be available if you can find the sizes or part numbers. When you say shifter, do you mean the shift knob, the shift cover or an air valve on top of the trans?
  22. Flywheel housings do have standard SAE bolt patterns that will match to all heavy duty transmissions. You will want to pay attention to your clutch and flywheel selection because all OEM's have different amounts of clearance. A Mack 9-spring clutch will probably not fit in any transmission you select.
  23. Search part number 20QE3333 or 20QE3333A. This is the part you need. You should be able to find something online.
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