:)
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Joined: Mar 2003
Posts: 40
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From: Colorado
Re:NV 5600 failures
Hey guys, new to the board ;D<br><br>Question for all of you who had NV5600 failures.<br><br>Did any of you have any noise from the trans while driving the truck before it let go?<br><br>Reason I'm asking is I have had this vibration/noise at 1900-2200rpm since the first of Febuary. Got in the truck to head to work one day and I could tell something just didn't sound and feel right while rowing through the gears. Just seemed to happen out of the blue. It's there all the time and seems more pronouced in 3rd thur 6th gear, drives me nuts going down the highway when it hits those rpm's. Now I know all about the exhaust drone that these trucks have and it almost sounds like that but a lot louder but the fact that you can feel a vibration on the go pedal and floor board at those rpm's that wasn't there before Feb. leads me to believe it's something else.<br><br>I was thinking what turns at the same rpm's as the engine all the time and all I can come up with is the power steering/brake booster pump, and the typical belt driven stuff, and the main input shaft on the trans. It doesnt do it while in nuetral has to be going down the road.<br><br>Sorry for the long rant but this is driving me crazy. Truck is a 2001.5 Quad swb ETH/DEE with 22,500 miles. Thanks tmccormick.<br><br>
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Re:NV 5600 failures
CTD359: Make sure you ask to see any left-over new parts when they finish the job. 
<br><br>tmcc: Take a look at the driveline vibration thread recently on this forum. Also, when you say it doesn't do it neutral, do you mean that you can shift out of gear at, for example, 65 mph, and the vibration stops? <br><br>GP
<br><br>tmcc: Take a look at the driveline vibration thread recently on this forum. Also, when you say it doesn't do it neutral, do you mean that you can shift out of gear at, for example, 65 mph, and the vibration stops? <br><br>GP
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Joined: Feb 2003
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From: Seattle, WA
Re:NV 5600 failures
Did any of you notice a change in the shifting of the tranny just before it went out(more notchy, harder shifting, etc...)? My tranny is behaving like the clutch is not entirely disengaging once I drive it for a few miles and it warms up. I have trouble going into 1,2 and R. The behavior is hit and miss, 20% of the time the tranny shifts smoothly and the rest of the time it is hard to get into gear and shifts really notchy.<br>I have about 53K on the truck and this started around 51k, I have a camper on the back( 2.5K lbs ) often. My truck was manufactured Feb 01'.
Chapter President
Joined: Mar 2003
Posts: 322
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From: Wasilla, Alaska
Re:NV 5600 failures
This thread is making me nervous! My 02' is notchy going into 3rd, and reverse is sometimes aqward. >
...I quess I will wait to see if it get's worse, if it does take it back to the dealer and start the warrenty battle.
...I quess I will wait to see if it get's worse, if it does take it back to the dealer and start the warrenty battle.
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Joined: Mar 2003
Posts: 40
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From: Colorado
Re:NV 5600 failures
Gear Poet, yes thats what I meant...can be going down the highway and take it out of gear...smooth as silk, vibration/noise goes away. Put it back in 6th and it all comes back. Speed of the truck doesn't seem to matter, its just at those rpms and it seems to be getting worse the more i drive it. <br><br>I'm a member of the TDR and I posted this problem but may have confused everyone because I added the VP44 oscilation sound the pump makes like it shifts gears but the truck has been doing that as long as I can remember. They kind of blew it off as the exhaust drone but I know darn well thats not what I'm experiencing now. I have NOT reposted on the TDR about this because I just wanted to see if it gets any worse as it seems to be. I was just checking out this board and noticed the thread about the NV5600 failures and had to post 
<br><br>Someone on the TDR said some folks were finding loose bell housing/trans and flywheel bolts and I did check all that(bell housing and trans) and found nothing loose. Just wonder if possibly I have a flywheel/clutch issue here because just as benc stated in the above post about the shifting feel and clutch ingaugement seems to have changed also.<br><br>Thanks for the replys tmccormck.
<br><br>Someone on the TDR said some folks were finding loose bell housing/trans and flywheel bolts and I did check all that(bell housing and trans) and found nothing loose. Just wonder if possibly I have a flywheel/clutch issue here because just as benc stated in the above post about the shifting feel and clutch ingaugement seems to have changed also.<br><br>Thanks for the replys tmccormck.
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Re:NV 5600 failures
I'm going to go off on a lengthy rant here:
As I said above -- I noticed this problem test driving a bunch of new trucks with 6 speeds in '01 and '02 -- four out of 11 had notchy shifting, and the others were a lot better. I bought one of those that were "better." Still, there were times in the first 2000 miles when I'd grind a bit between 2nd & 3rd when cold, and reverse was a bit balky. I looked into the matter, talked to mechanics, read the available literature, and decided to change the lubricant. When I pulled the PTO plate off to drain it out, I found a lot of metal on the magnet in the bottom. [Muddy confirmed that he saw the same conditions in his.] I tried Redline MTL, because I'd had a lot of success with it -- 230K miles on one truck, 210K on another --and because the published *industry* specifications are superior to the factory fluid. The difference is noticeable -- the cold grinding stopped, and the balky reverse eased up, and the fluid temperature when pulling 12K lbs. in the mountains is about 30*F less.
I think these transmissions are complex and prone to quality control issues. I believe NVG's Texaco MTX requirement is a corporate decision that may not reflect reflect what is best for these components. (I'm willing to be convinced otherwise, but NVG's response to mine and other queries has been remarkably "tight-lipped". Redline and other manufacturers have assured me that there is no "magic formula" in MTX -- industry standards are, by definition, comprehensive.) The issue is finding a formula that will cushion gear shock and oil shear in heavy-towload conditions, without ramping up the corrosive effects on the yellow-metal synchros.
I think that if you manage to get a well-built 5600 and set it up properly, the transmission will be nearly bullet-proof. I think the weak link in the 5600 is the synchros -- and I suspect that the "rounding off" of gears comes about because of tooth cracks developing during clashes and misaligning on the shafts.
tmccormick -- assuming it *only* happens in 6th gear, I would suspect a problem with transmission. I had an IH one-ton that did what you've described (in 4th, only had four speeds), and it turned out to be a couple of chipped teeth on the gear itself and a scored shaft. If it vibrates in all gears at that RPM, then it still could be a variety of things in the transmission or the rest of the driveline. Unless you've done it already, I'd check axles, pinion, driveshaft balance, u-joints & transfer case, etc., before I'd tear into the transmission ($$$).
02DSLDOG -- Your "symptoms" sound a lot like mine -- and I think mine is a "good" transmission. I wouldn't worry about it. If you want to try Redline MTL or Royal Purple to clear it up a bit, be aware that this is a possible warranty issue -- assuming the dealer would check or know the difference. Generally, I'm all for the concept of "you play, you pay." Not here. This lubricant issue is *exactly* what Magnuson-Moss was created to prevent.
Last point: The 5600 is a dog of transmission to shift anyway -- built for towing, not for speed shifts and smoothness -- and you've got to expect to shift differently than a Tacoma, or even a Ford. Smoking ricers, PSD's or Duramax's is not what it does best.
Rant switch off. Apologies-for-length switch on. :-[
GP
As I said above -- I noticed this problem test driving a bunch of new trucks with 6 speeds in '01 and '02 -- four out of 11 had notchy shifting, and the others were a lot better. I bought one of those that were "better." Still, there were times in the first 2000 miles when I'd grind a bit between 2nd & 3rd when cold, and reverse was a bit balky. I looked into the matter, talked to mechanics, read the available literature, and decided to change the lubricant. When I pulled the PTO plate off to drain it out, I found a lot of metal on the magnet in the bottom. [Muddy confirmed that he saw the same conditions in his.] I tried Redline MTL, because I'd had a lot of success with it -- 230K miles on one truck, 210K on another --and because the published *industry* specifications are superior to the factory fluid. The difference is noticeable -- the cold grinding stopped, and the balky reverse eased up, and the fluid temperature when pulling 12K lbs. in the mountains is about 30*F less.
I think these transmissions are complex and prone to quality control issues. I believe NVG's Texaco MTX requirement is a corporate decision that may not reflect reflect what is best for these components. (I'm willing to be convinced otherwise, but NVG's response to mine and other queries has been remarkably "tight-lipped". Redline and other manufacturers have assured me that there is no "magic formula" in MTX -- industry standards are, by definition, comprehensive.) The issue is finding a formula that will cushion gear shock and oil shear in heavy-towload conditions, without ramping up the corrosive effects on the yellow-metal synchros.
I think that if you manage to get a well-built 5600 and set it up properly, the transmission will be nearly bullet-proof. I think the weak link in the 5600 is the synchros -- and I suspect that the "rounding off" of gears comes about because of tooth cracks developing during clashes and misaligning on the shafts.
tmccormick -- assuming it *only* happens in 6th gear, I would suspect a problem with transmission. I had an IH one-ton that did what you've described (in 4th, only had four speeds), and it turned out to be a couple of chipped teeth on the gear itself and a scored shaft. If it vibrates in all gears at that RPM, then it still could be a variety of things in the transmission or the rest of the driveline. Unless you've done it already, I'd check axles, pinion, driveshaft balance, u-joints & transfer case, etc., before I'd tear into the transmission ($$$).
02DSLDOG -- Your "symptoms" sound a lot like mine -- and I think mine is a "good" transmission. I wouldn't worry about it. If you want to try Redline MTL or Royal Purple to clear it up a bit, be aware that this is a possible warranty issue -- assuming the dealer would check or know the difference. Generally, I'm all for the concept of "you play, you pay." Not here. This lubricant issue is *exactly* what Magnuson-Moss was created to prevent.
Last point: The 5600 is a dog of transmission to shift anyway -- built for towing, not for speed shifts and smoothness -- and you've got to expect to shift differently than a Tacoma, or even a Ford. Smoking ricers, PSD's or Duramax's is not what it does best.
Rant switch off. Apologies-for-length switch on. :-[
GP
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Joined: Mar 2003
Posts: 40
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From: Colorado
Re:NV 5600 failures
OK let me clear a couple of things up.<br><br>First off since new, the truck never did have the shifting problems some have had, still shifts without being "notchy" or grinding.<br><br>Second, it makes this vibration/noise in ALL gears just more pronouced in 3rd,4th.5th and worst of all 6th. 6th gear seems to produce the loudest hum and most vibration while crusing down the highway at 1900-2200rpm. One other thing I might add is when just crusing at that rpm then mash the throttle it REALLY makes alot of noise/vibration untill the rpms hit about 2600rpms then kind of goes away. <br><br>It really feels like there is something loose the way the vibration is felt on the pedal and floor board.<br><br>Also I havn't taken the truck to the dealer yet just for the fact they will probably say they cannot reproduce the problem :
Chapter President
Joined: Mar 2003
Posts: 322
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From: Wasilla, Alaska
Re:NV 5600 failures
Gear Poet: Youve taken my breath away with that rant! Nice job, think I need a tissue. 
... I think your right, the dealer would probly have issue's if I went to something like that. I am just going to drive the truck and if it goes, well the dealer has to own up to it. Period! I just love walking into a dealership with a warrenty problem and act stupid, let them dig there own hole, and then, WHAM! Suckers!
... I think your right, the dealer would probly have issue's if I went to something like that. I am just going to drive the truck and if it goes, well the dealer has to own up to it. Period! I just love walking into a dealership with a warrenty problem and act stupid, let them dig there own hole, and then, WHAM! Suckers!
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Re:NV 5600 failures
I've only dealt with the six speed in my dad's vette and those are prone to blow the second and third gear snychros cause of the way they are set up (tranny is in rear of car instead of center). Apparently, you can't speed shift these things. Not all T-56's are like this, only the Vette's. One time, we blew all the synchros, second and third gears were smooth, the cones were busted, the shift forks were bent. With only 4000 miles on it!!!!! 2000 miles later, back in the shop for the same thing. Put a short throw shifter on it about 2000 miles ago and haven't had a problem since. I'm wondering if maybe you can pull to far back on the stick and put a bind on the snychros. I know that that may have been a cause on the vette since we had previously installed a new handle on it and it raised it to high and gave you to much leverage. Just a thought for those of you who race your trucks.
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Re:NV 5600 failures
Sorry to here about your troubles. You have got a crappy dealer. I am amazed with all these people talking about NV5600 problems. That tranny has been super for us. We have sold a bunch of em and have never had to replace one. Unless you count the one that came out of the factory with NO OIL in it 
It had 10 mile son it by the time it got to us and it had a noise so we checked the fluid and there was none. DC sent us a new tranny asap and then we were good as new 
It had 10 mile son it by the time it got to us and it had a noise so we checked the fluid and there was none. DC sent us a new tranny asap and then we were good as new
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Re:NV 5600 failures
I'm sorry to hear about that. That really sucks. Kind of like my dealer. Took truck in on Mon for new pump. Got a call Tues saying that warranty is voided cause of FP gauge. Argue with that. Check pressure on Wed, decided that it needs a new pump (no kidding :). Ordered pump Thurs. Received pump Fri. morning had it back to me Fri. night. : : See if I ever go back to them again.
). Ordered pump Thurs. Received pump Fri. morning had it back to me Fri. night. : : See if I ever go back to them again.
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Joined: Jul 2001
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From: San Antonio,TX
Re:NV 5600 failures
If the transmission was set up correctly and was not abused then the failure is most likely caused by the steel used for the gears being out of spec.. I have 63k on mine and it has been great. I still shift like it has an older transmission. This transmission does not like being forced to go into a gear that it is not ready to go into.
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Joined: Nov 2002
Posts: 615
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From: Ft. McMurray Alberta
Re:NV 5600 failures
Scotty do you have access to the Gear Centre, these guys usually stock stuff like NV5600's. Have the DC rep push the dealer into picking up the "New" trans at The Gear Center using dealer to install only. Discuss the issue of down time back charge as you use the truck for work. Disclose the name of the dealer and locally we will help you not promote them. The DC rep is going to tell you he can't do that-horsepucky-he has the ability to out source for parts when necessary just like they can access Cummins for most parts when they can't supply for the engines. You also have the right to move the vehicle to another dealer to do the warranty work when the existing one is unsatisfactory. You already realize these guys are good at the BS shuffle,so purchase a Polaroid or digital and photograph all that they say is wrong. Take a witness with gear experience and mechanics license while you document the failure as discribed by there tech. Do not allow them to dispose of any parts until documented. They will then try to ban you from their shop based on insurance, more crap you have the right as the owner to be involved directly in all descisions regarding "your" property. Life sucks for them if your second witness happens to be a lawyer in blue jeans. PK
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Re:NV 5600 failures
You've got more patience than I do. What pisses me off is that since I'm 17, they think that I'm just some dumb punk kid who doesn't know anything and that they can BS me around to no end. I've had to get my parents invovled many times cause that's what my dealer did to me. Once my parents got involved, started happening a lot quicker. I hate being a teenager. Hope everythign goes alright with your truck man. Later.
