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Old 02-25-2012, 04:43 PM   #1 (permalink)
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NV5600 problems

Hello whenever it is cold out the first time i go through all gears in the morning 3rd and 5 doesnt really grind its just a little hard to go in but when the transmission is warm its fine. what could this be? Also reverse has been having problems its kinda hard to go into gear sometime. my truck only has 110,000 miles on it so i would think my tranny wouldnt be worn out.
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Old 02-25-2012, 07:19 PM   #2 (permalink)
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Mine is kind of hard to shift and grinds 2-3 when cold, smooth as butter when it's warm. When was the last time you changed oil in it? I'd suggest changing it, pulling the left PTO cover and cleaning the magnet in the bottom of the case. Personally I run the amsoil synchromesh, but there are tons of threads about that subject.
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Old 02-26-2012, 03:21 PM   #3 (permalink)
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yeah mine does the same thing.. i have to shift into 5th gear before going into reverse all the time or it will grind... but as smooth as butter you say? how so? mine is hard to get into 2nd when sitting at a light. from neutral to 2nd to start off... weird... any thoughts? i have already changed the oil and cleaned the magnet i just dont know what else i could try... also call dodge to see what oil to put in it cause the parts store will try and tell you some atf4 and thats not it... its a heavy duty oil thats about 20$ a quart
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Old 02-26-2012, 03:40 PM   #4 (permalink)
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Same issue here. Amsoil seemed to help. The syncros in the transmissions are usually the issue. I have learned to deal with it instead of paying the $500 for a syncro kit or $900 for the bearing and syncro rebuild kit. I will wait until they completely give up and they I will do a full rebuild
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Old 02-26-2012, 03:52 PM   #5 (permalink)
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redline makes a 70w 80 gear oil which is made for the nv5600 Red Line Synthetic Oil - Gear Oil for Manual Transmissions - MTL 70W80 GL-4 Gear Oil
its a little heavier and makes shifting a trany with a few more miles on it a little easer
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Old 02-28-2012, 12:27 AM   #6 (permalink)
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i have the same problem with reverse, have to stick in in first or just hold a little pressure on it in reverse and wait a few seconds for it to slip in, then goes in all the way as i start to release the clutch. my tranny only has 70k on it, but im pretty sure the synchros are bad. i agree, ive just learned to deal with it haha.
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Old 02-28-2012, 01:21 AM   #7 (permalink)
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Its reverse. Mine has been out for.almost 120k miles(have 142k now) I just deal with it.
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Old 02-28-2012, 01:30 AM   #8 (permalink)
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I just double clutch or float so that i dont really care how worn my syncros are.

And for the guys haveing trouble with reverse That should not be an issue. Just slip it in 5th before reverse. The gearing to the sycros gives the 5th gear sycro more leverage to slow the shafts down. NBD
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Old 02-28-2012, 08:54 AM   #9 (permalink)
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Yeah i hardly use my clutch anyways just taking off and reverse obviously.

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Old 02-28-2012, 06:29 PM   #10 (permalink)
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The NV5600 is supposed to take a 5w-30 synchromesh fluid, not a 70-80 grear oil. Amsoil and Mopar are your only options. Mine does the same thing. I push the clutch in and hold it for about 4-5 sec then it will usually shift right into gear. I will also act like I'm puting it into 1st gear then slide it right into 2nd. There clanky clunk HD tranny's. Learn to live with it.
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Old 02-28-2012, 09:42 PM   #11 (permalink)
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Wow, didn't know everyone else has similar problems! How many of you guys start off in 3rd? I sometimes start off in 3rd and then shift to 5th then 6th.


What's the low down with the Gorrila Juice? Good or bad?
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Old 02-28-2012, 10:22 PM   #12 (permalink)
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Gorilla juice is good for the G56, not sure if they make some for the 5600.

Nope I rarely start in third. Just a heads up, just cause an oil makes you NV shift like butter doesn't mean its good for it. If its not the right lubicity it will wear the scyros out while it seems to shift really smooth for a few thousand miles. I put LSD additive in mine to go easy on the sycros but it certainly didn't make it shift smoother if your trying to drive it like a car. The only time it drives like a car is when its cold and the oil is so thick it slows down the countershaft about the same speed the engine spins down. The rest of the time I'm double clutching or floating.
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