2 STICK PUPPY Posted June 14, 2014 Share Posted June 14, 2014 I have a 1995 RD with a E7 350 with a Mack 13 speed ... the problem is with Hi range. When you flip the splitter you hear it clack like it's supposed to but it goes into neutral low range is fine .. no noises from trans. Any suggestions? Quote Link to comment Share on other sites More sharing options...
j_martell Posted June 14, 2014 Share Posted June 14, 2014 hmmmmmm....no grinding like it's stuck between ranges at all.....maybe the high box is buggered??Sorry I can't be of much help here.... Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment Share on other sites More sharing options...
Dirtymilkman Posted June 15, 2014 Share Posted June 15, 2014 Sounds like your snap ring broke off of the shaft in the tranny. When it breaks there's nothing to move the gears from low to hi. They make the new shafts with a wider groove for thicker snap rings. Quote Link to comment Share on other sites More sharing options...
2 STICK PUPPY Posted June 15, 2014 Author Share Posted June 15, 2014 I was afraid of that .. I was hoping not to pull the unit Quote Link to comment Share on other sites More sharing options...
Macktech689 Posted June 15, 2014 Share Posted June 15, 2014 Before you pull it out, check the bolt at the yoke if its loose replace it and see what it does. Its also possible the bolt in the range fork has come loose that will also cause problems. Has the range shift been grinding or disengaging recently? Quote Link to comment Share on other sites More sharing options...
2 STICK PUPPY Posted June 15, 2014 Author Share Posted June 15, 2014 I have to ask the driver. The claims that it was Ok when he parked it on Friday and Saturday as soon as he pulled out it didn't work. Sounds odd to me Quote Link to comment Share on other sites More sharing options...
Macktech689 Posted June 15, 2014 Share Posted June 15, 2014 Sure does, stuff like that doesn't break sitting overnight. Maybe he didn't want to work on a saturday, just kidding! Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted June 16, 2014 Share Posted June 16, 2014 Both of mine that went bad broke the very first range change in the morning. Quote Link to comment Share on other sites More sharing options...
2 STICK PUPPY Posted June 16, 2014 Author Share Posted June 16, 2014 What broke in your transmission. .. I asked another driver that drove it a week ago and he said every once and a while when you come out of 4th pre selected you can hear it grind coming out but went into 5th fine with no noises Quote Link to comment Share on other sites More sharing options...
2 STICK PUPPY Posted June 16, 2014 Author Share Posted June 16, 2014 Got to bump this up ... heading into work now to dissect it ... hope I can fix it in the truck Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted June 16, 2014 Share Posted June 16, 2014 My mack trannys always make that grinding noise. Its just intermittent. That snap ring can be broke for a long time before it decides to fall off. Quote Link to comment Share on other sites More sharing options...
2 STICK PUPPY Posted June 16, 2014 Author Share Posted June 16, 2014 Ya think I can replace the snap ring without removing the trans Quote Link to comment Share on other sites More sharing options...
bbigrig Posted June 20, 2014 Share Posted June 20, 2014 Nope. Will need to pull the Trans. There is also an updated shaft that needs to be changed with that snap ring. It's the weakest part of the Mack T200/300 series of Trannies. Don't put to much blame on the driver. The worst thing most of us do is pre select the range shift and make the shift under torque load while progressively shifting for fuel economy. We are suppose to pre select but wind that gear out so its not pulled out of low range to high under torque load. I made the mistake of putting one of my Mack's with a T200 trans into heavy regional use. With the updated shaft and ring it does a lot better. The shaft is another $400 on top of the labor to pull it out and pull the rear housing off. It's the last Mack in daily use I have with a Mack Trans for that reason. Its to expensive and unreliable for the heavy regional use. No issues with my Fullers with over 1 million kms. Quote Link to comment Share on other sites More sharing options...
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