nv4500 grinds going into 3rd - Dodge Cummins Diesel Forum
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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 94-98 12V Forums > 94-98 Powertrain
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Old 01-05-2012, 12:02 AM   #1 (permalink)
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nv4500 grinds going into 3rd

I searched the treads and I think I have my problem figured out just want some opinions I just did a auto to nv4500 swap and put a new valair clutch kit and slave cylinder and filled it with factory mopar fluid about 150 miles ago and I drove the truck on Sunday which was about 45-50 degrees and it shifted flawlessly. I parked it on Sunday and got in on Wednesday which was about 11 degrees and got about 5 miles from my house and went to down shift from 4th-3rd and it grinded and little but went into gear i thought I may of not had the clutch pedal in enough but then it started grinding shifting from 2nd-3rd and will only go in if I let the rpms drop then it goes in smooth and stays in and now down shifting is impossible from 4th-3rd all the other gears 1st, 2nd,4th,5th, and reverse work fine and go in smooth would 3rd gear syncros go out just like that or is something else wrong? I also drained the transmission today and took the pto covers off and cleaned it all out and topped it off with 5 quarts instead of 4 this time to see if it would make a difference and I helped a little bit on the upshifted part but still grinds but it did not help the down shifting do u guys think itís the syncros or just the cold weather? Any tips or info would be great thanks guys
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Old 01-05-2012, 02:07 AM   #2 (permalink)
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I had that problem.. new syncro and it was good.
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Old 01-17-2012, 08:54 AM   #3 (permalink)
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check your master/slave cylinders..if they are good its a bad 3rd gear synchro. double clutch shifts until you can rebuild the trans.
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Old 01-18-2012, 01:47 AM   #4 (permalink)
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mine has been doing that for a while... im just double clutching it and not let my crazy woman drive it till i go fuller
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Old 01-18-2012, 03:47 AM   #5 (permalink)
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wheres a good place to get a rebuild kit for the nv4500?
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Old 01-18-2012, 04:19 AM   #6 (permalink)
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just grind it till you find it!
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Old 12-02-2012, 09:52 AM   #7 (permalink)
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What did this cost to fix mine is doing the same thing. Grinds just going into 3rd at higher rpms.
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Old 12-02-2012, 10:11 AM   #8 (permalink)
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east coast gear supply
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Old 12-02-2012, 02:51 PM   #9 (permalink)
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mine does the same i just shift easier into third till i can get it fixed
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Old 12-02-2012, 08:00 PM   #10 (permalink)
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Lol mine does too.. Its worse when trying to shift quicker though. I just shift from 2nd to 3rd slow and easy like a big rig now
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Old 12-03-2012, 01:33 AM   #11 (permalink)
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mine is the exact same way if i hold it and 2100 for a second or 2 and then let off it will slide right in but if i just shift normally it grinds going in on the up shift hoped it was a clutch issue but just installed a valair dual disc yesterday and no change been doint it for over 12,000 mikes and hasnt gotten worse so im not gonna worry about it
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Old 12-03-2012, 06:57 PM   #12 (permalink)
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My truck was like this when I got it... found a NV4500 for a good price (because it had the same issue), put a 3rd gear syncro, put 5th gear nut fix on it, went through the rest of it (looked good), and swapped it... then fixed the one out of my truck & sold it.

not hard to do, but there are some specific tools you'll need.

seems common enough that I now double-clutch going into 3rd just to keep from wearing it out.
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