Six Speed Gear Clash
02-20-2003, 07:55 AM
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Six Speed Gear Clash
I have a 2001 4WD 2500, HO with 6 spd. The Trans shifting started out a little tight, but was feeling OK by 25000 miles. Now at 70000 miles, I am feeling some gear grinding when going into 4th, and occasionally into 3rd. I can usually avoid the clash by hesitating a second or 2 before dropping into gear, but when shifting normally, I get it about 30% of the time. Dealer says that with 70000 miles, normal wear on the shifting parts is causing it, and not to worry, no big problem.<br><br>Any ideas or opinions. I cringe each time it happens, and would like to know what the real problem is, how or if it should be remedied, etc.<br><br>Changed the fluid and put Mopar's Hi $$ synthetic fluid back in. I pull a 16000# tri-axle gooseneck about 30% of the time, the rest easy empty hiway miles.
02-20-2003, 10:43 AM
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Re:Six Speed Gear Clash
Sounds like your "yellow-metal" synchronizers are going south, and no, that's *not* normal for 70K miles. <br><br>You say you changed out the oil for Mopar synthetic -- What did you have in there before? If you were using a GL-5 rated oil, synthetic or dino, that's the problem. GL-5 will wear erode the synchros in about 40-50K miles. <br><br>If you had the original Mopar fluid in there for the full 70K miles while pulling the trailer, that's abusing the transmission -- but I wouldn't think the synchros would wear quite that fast. <br><br>When you changed out the oil, did you clean the magnetic pad at the bottom of the transmission, after popping off the PTO cover(s)? A lot of metal would be an indication. <br><br>You might try using a synthetic oil like Royal Purple or Redline MTF (I'm partial to Redline). They're easier on the synchros and may *partially* solve the problem -- even easier than the Mopar standard, I've noticed. <br><br>GP
02-24-2003, 02:07 PM
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Re:Six Speed Gear Clash
At about how many miles should I change my tranny fluid. I have the same drivetrain and year as prairieguy and would like to avoid such problems. Right now I'm just shy of 45,000 miles.<br><br>-SFB
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